Babies Who Habituate Rapidly Are Highly Distractible. Likely to Be More Intelligent.

Chapter 7. Growing and Developing

vii.ii Infancy and Childhood: Exploring and Learning

Learning Objectives

1. Describe the abilities that newborn infants possess and how they actively collaborate with their environments.
2. List the stages in Piaget's model of cognitive evolution and explain the concepts that are mastered in each stage.
3. Critique Piaget's theory of cognitive development and depict other theories that complement and expand on it.
4. Summarize the of import processes of social evolution that occur in infancy and babyhood.

If all has gone well, a baby is born sometime effectually the 38th calendar week of pregnancy. The fetus is responsible, at least in part, for its own nascence because chemicals released by the developing fetal brain trigger the muscles in the mother's uterus to start the rhythmic contractions of childbirth. The contractions are initially spaced at about xv-minute intervals merely come more than chop-chop with fourth dimension. When the contractions reach an interval of two to three minutes, the mother is requested to assist in the labour and help button the babe out.

The Newborn Arrives With Many Behaviours Intact

Newborns are already prepared to face up the new earth they are almost to experience. As you can see in Table 7.ii, "Survival Reflexes in Newborns," babies are equipped with a variety of reflexes, each providing an ability that will assist them survive their first few months of life as they continue to learn new routines to help them survive in and manipulate their environments.

Tabular array 7.2 Survival Reflexes in Newborns.

[Skip Table]
Proper name	Stimulus	Response	Significance	Video Example
Rooting reflex	The baby's cheek is stroked.	The babe turns its caput toward the stroking, opens its rima oris, and tries to suck.	Ensures the baby's feeding will be a reflexive habit	Watch "The Rooting Reflex" [YouTube]
Blink reflex	A light is flashed in the baby's eyes.	The baby closes both eyes.	Protects eyes from stiff and potentially dangerous stimuli	Scout "Baby Blinking" [YouTube]
Withdrawal reflex	A soft pinprick is practical to the sole of the infant's foot.	The infant flexes the leg.	Keeps the exploring babe away from painful stimuli	Sentry "Infant Withdraw Reflex" [YouTube]
Tonic neck reflex	The baby is laid down on its back.	The infant turns its head to one side and extends the arm on the same side.	Helps develop hand-eye coordination	Scout "Tonic Neck Reflex" [YouTube]
Grasp reflex	An object is pressed into the palm of the babe.	The baby grasps the object pressed and can even hold its own weight for a brief catamenia.	Helps in exploratory learning	Lookout "Grasp reflex" [YouTube]
Moro reflex	Loud noises or a sudden drib in height while holding the infant.	The baby extends arms and legs and quickly brings them in as if trying to grasp something.	Protects from falling; could have assisted infants in holding on to their mothers during rough travelling	Picket "Moro Reflex" [YouTube]
Stepping reflex	The baby is suspended with bare anxiety just in a higher place a surface and is moved forward.	Babe makes stepping motions equally if trying to walk.	Helps encourage motor development	Watch "Stepping Reflex" [YouTube]

In addition to reflexes, newborns have preferences — they similar sweet-tasting foods at kickoff, while becoming more open up to salty items by four months of age (Beauchamp, Cowart, Menellia, & Marsh, 1994; Blass & Smith, 1992). Newborns also prefer the scent of their mothers. An baby only six days old is significantly more probable to plow toward its own mother's breast pad than to the breast pad of another baby's mother (Porter, Makin, Davis, & Christensen, 1992), and a newborn as well shows a preference for the face of its own mother (Bushnell, Sai, & Mullin, 1989).

Although infants are born ready to appoint in some activities, they also contribute to their own development through their own behaviours. The child's cognition and abilities increment as it babbles, talks, crawls, tastes, grasps, plays, and interacts with the objects in the surround (Gibson, Rosenzweig, & Porter, 1988; Gibson & Pick, 2000; Smith & Thelen, 2003). Parents may help in this process by providing a variety of activities and experiences for the child. Research has found that animals raised in environments with more than novel objects and that engage in a variety of stimulating activities have more brain synapses and larger cerebral cortexes, and they perform meliorate on a variety of learning tasks compared with animals raised in more than impoverished environments (Juraska, Henderson, & Müller, 1984). Like furnishings are probable occurring in children who have opportunities to play, explore, and interact with their environments (Soska, Adolph, & Johnson, 2010).

Enquiry Focus: Using the Habituation Technique to Study What Infants Know

Information technology may seem to you that babies have little ability to view, hear, empathise, or remember the world around them. Indeed, the famous psychologist William James presumed that the newborn experiences a "blooming, buzzing confusion" (James, 1890, p. 462). And you may recollect that, even if babies practise know more than James gave them credit for, information technology might not be possible to find out what they know. After all, infants can't talk or respond to questions, so how would we always observe out? Merely over the past 2 decades, developmental psychologists take created new ways to determine what babies know, and they have institute that they know much more than you, or William James, might have expected.

I way that we can larn most the cognitive development of babies is by measuring their behaviour in response to the stimuli around them. For instance, some researchers have given babies the chance to control which shapes they go to come across or which sounds they become to hear according to how hard they suck on a pacifier (Trehub & Rabinovitch, 1972). The sucking behaviour is used as a measure of the infants' interest in the stimuli — the sounds or images they suck hardest in response to are the ones we tin can presume they prefer.

Another arroyo to understanding cognitive development by observing the behaviour of infants is through the use of the habituation technique. Habituation refers to the decreased responsiveness toward a stimulus later on it has been presented numerous times in succession. Organisms, including infants, tend to exist more interested in things the first few times they experience them and become less interested in them with more frequent exposure. Developmental psychologists have used this general principle to aid them understand what babies remember and understand.

In the habituation procedure,^[1] a baby is placed in a high chair and presented with visual stimuli while a video camera records the babe's eye and face movements. When the experiment begins, a stimulus (due east.m., the face of an adult) appears in the baby'due south field of view, and the amount of time the infant looks at the face up is recorded by the camera. So the stimulus is removed for a few seconds before information technology appears once again and the gaze is over again measured. Over time, the babe starts to habituate to the face, such that each presentation elicits less gazing at the stimulus. So a new stimulus (east.g., the face of a different adult or the same face looking in a different direction) is presented, and the researchers observe whether the gaze fourth dimension significantly increases. You lot tin can run into that if the infant'southward gaze time increases when a new stimulus is presented, this indicates that the baby can differentiate the 2 stimuli.

Although this procedure is very simple, information technology allows researchers to create variations that reveal a great deal most a newborn's cognitive ability. The pull a fast one on is simply to change the stimulus in controlled ways to run across if the infant "notices the divergence." Research using the habituation process has found that babies tin notice changes in colours, sounds, and even principles of numbers and physics. For instance, in one experiment reported by Karen Wynn (1995), half-dozen-calendar month-sometime babies were shown a presentation of a puppet that repeatedly jumped up and down either 2 or iii times, resting for a couple of seconds between sequences (the length of time and the speed of the jumping were controlled). After the infants habituated to this display, the presentation was changed such that the puppet jumped a different number of times. As you can run across in Figure vii.ii, "Can Infants Do Math?" the infants' gaze time increased when Wynn changed the presentation, suggesting that the infants could tell the difference betwixt the number of jumps.

Figure seven.2 Can Infants Exercise Math? Karen Wynn institute that babies that had habituated to a boob jumping either two or iii times significantly increased their gaze when the puppet began to jump a different number of times.

Cognitive Development During Childhood

Childhood is a fourth dimension in which changes occur quickly. The kid is growing physically, and cognitive abilities are also developing. During this time the kid learns to actively manipulate and command the environment, and is first exposed to the requirements of society, particularly the need to control the bladder and bowels. According to Erik Erikson, the challenges that the child must reach in babyhood relate to the evolution of initiative, competence, and independence. Children need to learn to explore the world, to become cocky-reliant, and to make their ain way in the environs.

Figure 7.three Portrait of Jean Piaget. Jean Piaget developed his theories of kid evolution by observing the behaviours of children.

These skills do non come overnight. Neurological changes during childhood provide children the ability to practise some things at certain ages, and however make information technology impossible for them to do other things. This fact was fabricated apparent through the groundbreaking work of the Swiss psychologist Jean Piaget (Figure 7.iii). During the 1920s, Piaget was administering intelligence tests to children in an try to make up one's mind the kinds of logical thinking that children were capable of. In the procedure of testing them, Piaget became intrigued, not so much by the answers that the children got right, but more than by the answers they got wrong. Piaget believed that the incorrect answers the children gave were not mere shots in the dark but rather represented specific ways of thinking unique to the children'south developmental stage. Merely as almost all babies learn to roll over before they larn to sit up by themselves, and learn to crawl before they acquire to walk, Piaget believed that children gain their cognitive ability in a developmental gild. These insights — that children at different ages think in fundamentally different ways — led to Piaget's stage model of cognitive development.

Piaget argued that children do not just passively learn simply too actively try to make sense of their worlds. He argued that, equally they learn and mature, children develop schemas — patterns of knowledge in long-term memory — that help them call up, organize, and respond to information. Furthermore, Piaget thought that when children experience new things, they attempt to reconcile the new knowledge with existing schemas. Piaget believed that children employ ii singled-out methods in doing so, methods that he chosen absorption and accommodation (encounter Effigy 7.iv, "Absorption and Accommodation").

Effigy seven.4 Assimilation and Accommodation.

When children employ absorption, they use already adult schemas to understand new information. If children have learned a schema for horses, then they may phone call the striped animal they see at the zoo a horse rather than a zebra. In this case, children fit the existing schema to the new data and characterization the new information with the existing knowledge. Accommodation, on the other hand, involves learning new information and thus irresolute the schema. When a female parent says, "No, honey, that'southward a zebra, not a horse," the child may suit the schema to fit the new stimulus, learning that there are different types of iv-legged animals, just one of which is a horse.

Piaget'south nearly important contribution to understanding cognitive development, and the fundamental aspect of his theory, was the idea that development occurs in unique and distinct stages, with each stage occurring at a specific fourth dimension, in a sequential manner, and in a way that allows the kid to call up about the world using new capacities. Piaget's stages of cognitive development are summarized in Table seven.3, "Piaget's Stages of Cognitive Development."

Table 7.3 Piaget's Stages of Cognitive Development.

[Skip Table]
Stage	Approximate age range	Characteristics	Phase attainments
Sensorimotor	Birth to about 2 years	The kid experiences the world through the fundamental senses of seeing, hearing, touching, and tasting.	Object permanence
Preoperational	2 to 7 years	Children acquire the ability to internally represent the earth through language and mental imagery. They also get-go to see the globe from other people'southward perspectives.	Theory of mind; rapid increment in language power
Concrete operational	7 to 11 years	Children go able to recall logically. They can increasingly perform operations on objects that are merely imagined.	Conservation
Formal operational	eleven years to machismo	Adolescents can recollect systematically, can reason about abstract concepts, and tin understand ethics and scientific reasoning.	Abstract logic

The first developmental stage for Piaget was the sensorimotor phase, the cerebral phase that begins at nascency and lasts until around the historic period of 2. Information technology is defined by the directly physical interactions that babies have with the objects around them. During this stage, babies form their kickoff schemas past using their primary senses — they stare at, heed to, reach for, hold, milk shake, and taste the things in their environments.

During the sensorimotor stage, babies' use of their senses to perceive the globe is so central to their understanding that whenever babies do non directly perceive objects, every bit far as they are concerned, the objects do non exist. Piaget found, for case, that if he commencement interested babies in a toy and then covered the toy with a blanket, children who were younger than six months of age would deed as if the toy had disappeared completely — they never tried to discover it under the blanket but would withal grinning and reach for information technology when the blanket was removed. Piaget institute that it was not until virtually 8 months that the children realized that the object was merely covered and not gone. Piaget used the term object permanence to refer to the child's ability to know that an object exists even when the object cannot be perceived.

Children younger than about eight months of age practice non understand object permanence.

Picket: Object Permanence [YouTube]: http://world wide web.youtube.com/v/nwXd7WyWNHY

At most two years of age, and until most seven years of age, children move into the preoperational stage. During this stage, children begin to employ language and to call back more abstractly virtually objects, with chapters to form mental images; however, their agreement is more intuitive and they lack much ability to deduce or reason. The thinking is preoperational, pregnant that the child lacks the ability to operate on or transform objects mentally. In i study that showed the extent of this inability, Judy DeLoache (1987) showed children a room within a minor dollhouse. Within the room, a small toy was visible behind a pocket-sized couch. The researchers took the children to another lab room, which was an exact replica of the dollhouse room, simply full-sized. When children who were 2.5 years old were asked to notice the toy, they did not know where to look — they were simply unable to make the transition across the changes in room size. Three-year-old children, on the other paw, immediately looked for the toy behind the couch, demonstrating that they were improving their operational skills.

The inability of young children to view transitions also leads them to be egoistic — unable to readily see and empathise other people's viewpoints. Developmental psychologists define the theory of mind equally the ability to have another person's viewpoint, and the power to do so increases quickly during the preoperational stage. In i demonstration of the evolution of theory of mind, a researcher shows a kid a video of another child (allow's call her Anna) putting a ball in a cerise box. So Anna leaves the room, and the video shows that while she is gone, a researcher moves the ball from the red box into a blue box. Every bit the video continues, Anna comes dorsum into the room. The child is so asked to point to the box where Anna will probably look to find her brawl. Children who are younger than four years of age typically are unable to understand that Anna does non know that the ball has been moved, and they predict that she volition look for information technology in the blue box. After four years of age, however, children have developed a theory of heed — they realize that unlike people tin have dissimilar viewpoints and that (although she will be wrong) Anna volition all the same think that the ball is still in the red box.

After well-nigh seven years of age until 11, the child moves into the concrete operational phase, which is marked by more frequent and more accurate utilise of transitions, operations, and abstract concepts, including those of time, infinite, and numbers. An important milestone during the concrete operational stage is the evolution of conservation — the agreement that changes in the class of an object do not necessarily mean changes in the quantity of the object. Children younger than seven years mostly retrieve that a glass of milk that is alpine holds more milk than a glass of milk that is shorter and wider, and they continue to believe this even when they run across the same milk poured back and forth between the glasses. Information technology appears that these children focus only on one dimension (in this case, the superlative of the glass) and ignore the other dimension (width). All the same, when children reach the physical operational stage, their abilities to understand such transformations brand them enlightened that, although the milk looks different in the unlike glasses, the amount must be the same.

Children younger than nearly vii years of age do non understand the principles of conservation.

Scout: "Conservation" [YouTube]: http://world wide web.youtube.com/watch?5=YtLEWVu815o&characteristic=youtu.be

At about 11 years of age, children enter the formal operational stage, which is marked by the power to recall in abstruse terms and to use scientific and philosophical lines of thought. Children in the formal operational stage are better able to systematically test alternative ideas to make up one's mind their influences on outcomes. For case, rather than haphazardly changing unlike aspects of a situation that allows no clear conclusions to exist drawn, they systematically make changes in 1 thing at a fourth dimension and observe what difference that particular modify makes. They acquire to utilize deductive reasoning, such equally "if this, then that," and they get capable of imagining situations that "might be," rather than just those that actually be.

Piaget'south theories have fabricated a substantial and lasting contribution to developmental psychology. His contributions include the idea that children are non merely passive receptacles of data only rather actively appoint in acquiring new noesis and making sense of the earth around them. This full general idea has generated many other theories of cognitive development, each designed to help us better empathize the development of the kid's data-processing skills (Klahr & MacWhinney, 1998; Shrager & Siegler, 1998). Furthermore, the all-encompassing research that Piaget's theory has stimulated has by and large supported his behavior almost the gild in which cognition develops. Piaget'south work has also been applied in many domains — for instance, many teachers make use of Piaget's stages to develop educational approaches aimed at the level children are developmentally prepared for (Driscoll, 1994; Levin, Siegler, & Druyan, 1990).

Over the years, Piagetian ideas have been refined. For example, it is now believed that object permanence develops gradually, rather than more immediately, every bit a true stage model would predict, and that it can sometimes develop much before than Piaget expected. Renée Baillargeon and her colleagues (Baillargeon, 2004; Wang, Baillargeon, & Brueckner, 2004) placed babies in a habituation setup, having them scout every bit an object was placed behind a screen, entirely subconscious from view. The researchers then arranged for the object to reappear from behind another screen in a different identify. Babies who saw this pattern of events looked longer at the display than did babies who witnessed the same object physically being moved between the screens. These data suggest that the babies were aware that the object still existed fifty-fifty though it was hidden backside the screen, and thus that they were displaying object permanence equally early on every bit three months of age, rather than the eight months that Piaget predicted.

Another factor that might take surprised Piaget is the extent to which a child'southward social surroundings influence learning. In some cases, children progress to new ways of thinking and retreat to one-time ones depending on the blazon of task they are performing, the circumstances they find themselves in, and the nature of the language used to instruct them (Courage & Howe, 2002). And children in different cultures bear witness somewhat different patterns of cerebral evolution. Dasen (1972) constitute that children in non-Western cultures moved to the adjacent developmental stage well-nigh a year later than did children from Western cultures, and that level of schooling also influenced cerebral development. In short, Piaget's theory probably understated the contribution of ecology factors to social development.

More recent theories (Cole, 1996; Rogoff, 1990; Tomasello, 1999), based in big function on the sociocultural theory of the Russian scholar Lev Vygotsky (1962, 1978), argue that cerebral evolution is non isolated entirely within the kid merely occurs at to the lowest degree in part through social interactions. These scholars contend that children's thinking develops through abiding interactions with more competent others, including parents, peers, and teachers.

An extension of Vygotsky's sociocultural theory is the idea of community learning, in which children serve as both teachers and learners. This approach is frequently used in classrooms to ameliorate learning likewise equally to increment responsibility and respect for others. When children piece of work cooperatively in groups to larn cloth, they can help and support each other's learning as well as larn most each other as individuals, thereby reducing prejudice (Aronson, Blaney, Stephan, Sikes, & Snapp, 1978; Brown, 1997).

Social Evolution During Childhood

It is through the remarkable increases in cognitive power that children acquire to interact with and understand their environments. Just these cerebral skills are only part of the changes that are occurring during childhood. Every bit crucial is the development of the child's social skills — the ability to understand, predict, and create bonds with the other people in their environments.

Knowing the Cocky: The Development of the Self-Concept

One of the of import milestones in a child'south social development is learning well-nigh his or her ain self-existence (Figure vii.5). This cocky-sensation is known as consciousness, and the content of consciousness is known as the self-concept. The self-concept is a knowledge representation or schema that contains noesis about us, including our behavior well-nigh our personality traits, physical characteristics, abilities, values, goals, and roles, as well as the knowledge that we exist equally individuals (Kagan, 1991).

Figure 7.five Recognizing Oneself in a Mirror. A simple test of self-awareness is the power to recognize oneself in a mirror. Humans and chimpanzees can pass the test; dogs never do.

Some animals, including chimpanzees, orangutans, and perhaps dolphins, have at to the lowest degree a primitive sense of self (Boysen & Himes, 1999). In i study (Gallup, 1970), researchers painted a ruddy dot on the foreheads of anesthetized chimpanzees and and then placed each creature in a cage with a mirror. When the chimps woke upwardly and looked in the mirror, they touched the dot on their faces, not the dot on the faces in the mirror. These deportment suggest that the chimps understood that they were looking at themselves and non at other animals, and thus we can assume that they are able to realize that they exist as individuals. On the other hand, virtually other animals, including, for example, dogs, cats, and monkeys, never realize that it is themselves in the mirror.

Infants who have a similar red dot painted on their foreheads recognize themselves in a mirror in the same manner that the chimps practice, and they do this by about 18 months of historic period (Povinelli, Landau, & Perilloux, 1996). The child's knowledge about the self continues to develop as the child grows. Past historic period two, the baby becomes enlightened of his or her sexual practice, as a male child or a girl. By age 4, self-descriptions are probable to be based on physical features, such equally hair colour and possessions, and by about age six, the child is able to understand bones emotions and the concepts of traits, being able to make statements such as "I am a nice person" (Harter, 1998).

Before long after children enter school (at near historic period 5 or six), they brainstorm to make comparisons with other children, a process known every bit social comparison. For case, a child might depict himself as being faster than i boy but slower than another (Moretti & Higgins, 1990). According to Erikson, the important component of this procedure is the evolution of competence and autonomy — the recognition of one's own abilities relative to other children. And children increasingly show awareness of social situations — they understand that other people are looking at and judging them the same way that they are looking at and judging others (Doherty, 2009).

Successfully Relating to Others: Attachment

One of the most important behaviours a child must learn is how to be accepted past others — the development of close and meaningful social relationships. The emotional bonds that nosotros develop with those with whom we feel closest, and specially the bonds that an baby develops with the mother or primary caregiver, are referred to every bit attachment (Cassidy & Shaver, 1999). See examples in Figure 7.half-dozen.

Effigy 7.6 Children's Attachment to Caregivers. Children develop appropriate attachment styles through their interactions with caregivers.

Every bit tardily every bit the 1930s, psychologists believed that children who were raised in institutions such as orphanages, and who received practiced physical care and proper nourishment, would develop normally, even if they had piffling interaction with their caretakers. Merely studies by the developmental psychologist John Bowlby (1953) and others showed that these children did not develop normally — they were usually sickly, emotionally slow, and mostly unmotivated. These observations helped make it clear that normal babe development requires successful attachment with a caretaker.

In 1 classic report showing the importance of attachment, Wisconsin Academy psychologists Harry and Margaret Harlow investigated the responses of young monkeys, separated from their biological mothers, to 2 surrogate mothers introduced to their cages. One — the wire mother — consisted of a circular wooden caput, a mesh of cold metallic wires, and a bottle of milk from which the babe monkey could drinkable. The second mother was a foam-rubber grade wrapped in a heated terry-cloth blanket. The Harlows plant that although the baby monkeys went to the wire mother for nutrient, they overwhelmingly preferred and spent significantly more time with the warm terry-cloth mother that provided no nutrient but did provide comfort (Harlow, 1958).

The studies past the Harlows showed that young monkeys preferred the warm mother that provided a secure base to the cold mother that provided food.

Watch: "The Harlows'southward Monkeys" [YouTube]: http://www.youtube.com/watch?v=MmbbfisRiwA

The Harlows's studies confirmed that babies have social as well every bit physical needs. Both monkeys and human being babies demand a secure base of operations that allows them to feel safe. From this base, they tin can gain the conviction they need to venture out and explore their worlds. Erikson (Table seven.1, "Challenges of Evolution as Proposed by Erik Erikson") was in agreement on the importance of a secure base of operations, arguing that the nigh important goal of infancy was the evolution of a basic sense of trust in one'southward caregivers.

Developmental psychologist Mary Ainsworth, a student of John Bowlby, was interested in studying the development of attachment in infants. Ainsworth created a laboratory test that measured an infant'southward attachment to his or her parent. The test is called the strange situation — a measure of zipper in immature children in which the child's behaviours are assessed in a situation in which the caregiver and a stranger move in and out of the environment — considering it is conducted in a context that is unfamiliar to the child and therefore likely to raise the child's need for his or her parent (Ainsworth, Blehar, Waters, & Wall, 1978). During the procedure, which lasts nearly 20 minutes, the parent and the baby are first left alone, while the infant explores the room full of toys. And then a foreign adult enters the room and talks for a minute to the parent, after which the parent leaves the room. The stranger stays with the infant for a few minutes, and and so the parent again enters and the stranger leaves the room. During the entire session, a video camera records the child's behaviours, which are later coded by trained coders.

In the strange situation, children are observed responding to the comings and goings of parents and unfamiliar adults in their environments.

Watch: "The Foreign Situation" [YouTube]: http://www.youtube.com/picket?5=QTsewNrHUHU

On the basis of their behaviours, the children are categorized into one of four groups, where each group reflects a different kind of attachment relationship with the caregiver. A kid with a secure attachment style usually explores freely while the mother is present and engages with the stranger. The child may be upset when the mother departs just is also happy to come across the mother return. A child with an clashing (sometimes chosen insecure-resistant) attachment mode is wary near the situation in general, particularly the stranger, and stays shut or even clings to the mother rather than exploring the toys. When the mother leaves, the child is extremely distressed and is ambivalent when she returns. The child may rush to the female parent only and so fail to cling to her when she picks upward the child. A child with an avoidant (sometimes called insecure-avoidant) attachment fashion will avoid or ignore the mother, showing little emotion when the mother departs or returns. The child may run away from the female parent when she approaches. The kid will not explore very much, regardless of who is there, and the stranger will not be treated much differently from the female parent.

Finally, a child with a disorganized attachment mode seems to have no consistent fashion of coping with the stress of the strange situation — the child may weep during the separation but avoid the mother when she returns, or the kid may approach the female parent but and so freeze or autumn to the flooring. Although some cultural differences in zipper styles take been found (Rothbaum, Weisz, Pott, Miyake, & Morelli, 2000), enquiry has also found that the proportion of children who fall into each of the attachment categories is relatively constant across cultures (run into Figure 7.7, "Proportion of Children With Dissimilar Zipper Styles").

Figure vii.7 Proportion of Children With Dissimilar Attachment Styles. The graph shows the estimate proportion of children who take each of the four attachment styles. These proportions are adequately constant beyond cultures. [Long Clarification]

You might wonder whether differences in zipper mode are adamant more by the kid (nature) or more past the parents (nurture). Near developmental psychologists believe that socialization is primary, arguing that a kid becomes securely attached when the female parent is available and able to meet the needs of the child in a responsive and appropriate fashion, only that the insecure styles occur when the mother is insensitive and responds inconsistently to the child'due south needs. In a straight exam of this idea, Dutch researcher Dymphna van den Nail (1994) randomly assigned some babies' mothers to a training session in which they learned to ameliorate reply to their children'due south needs. The inquiry found that these mothers' babies were more likely to show a secure attachment style compared with the babies of the mothers in a control group that did not receive training.

But the attachment behaviour of the child is besides likely influenced, at least in role, by temperament, the innate personality characteristics of the infant. Some children are warm, friendly, and responsive, whereas others tend to be more irritable, less manageable, and hard to console. These differences may also play a role in attachment (Gillath, Shaver, Baek, & Chun, 2008; Seifer, Schiller, Sameroff, Resnick, & Riordan, 1996). Taken together, it seems safe to say that attachment, similar most other developmental processes, is affected by an interplay of genetic and socialization influences.

Research Focus: Using a Longitudinal Research Design to Appraise the Stability of Attachment

Y'all might wonder whether the zipper style displayed past infants has much influence later in life. In fact, enquiry has plant that the attachment styles of children predict their emotions and their behaviours many years later (Cassidy & Shaver, 1999). Psychologists have studied the persistence of zipper styles over fourth dimension using longitudinal research designs — research designs in which individuals in the sample are followed and contacted over an extended catamenia of fourth dimension, often over multiple developmental stages.

In one such report, Waters, Merrick, Treboux, Crowell, and Albersheim (2000) examined the extent of stability and change in attachment patterns from infancy to early on adulthood. In their enquiry, 60 middle-grade infants who had been tested in the foreign situation at i yr of age were recontacted 20 years afterward and interviewed using a measure of adult attachment. Waters and colleagues institute that 72% of the participants received the aforementioned secure versus insecure attachment classification in early adulthood equally they had received as infants. The adults who changed categorization (usually from secure to insecure) were primarily those who had experienced traumatic events, such as the death or divorce of parents, astringent illnesses (contracted by the parents or the children themselves), or physical or sexual abuse by a family unit member.

In add-on to finding that people generally display the same attachment style over time, longitudinal studies have also found that the attachment classification received in infancy (as assessed using the foreign situation or other measures) predicts many childhood and adult behaviours. Securely attached infants have closer, more than harmonious relationships with peers, are less anxious and aggressive, and are better able to understand others' emotions than are those who were categorized as insecure every bit infants (Lucas-Thompson & Clarke-Stewart, 2007). And securely attached adolescents also accept more than positive peer and romantic relationships than their less securely attached counterparts (Carlson, Sroufe, & Egeland, 2004).

Conducting longitudinal research is a very hard task, merely ane that has substantial rewards. When the sample is large enough and the time frame long plenty, the potential findings of such a report can provide rich and important information almost how people change over time and the causes of those changes. The drawbacks of longitudinal studies include the cost and the difficulty of finding a large sample that tin be tracked accurately over time, and the time (many years) that it takes to get the data. In addition, because the results are delayed over an extended period, the research questions posed at the beginning of the report may become less relevant over fourth dimension equally the research continues.

Cross-exclusive research designs represent an culling to longitudinal designs. In a cross-sectional inquiry pattern, historic period comparisons are fabricated between samples of different people at dissimilar ages at ane time. In one example, Jang, Livesley, and Vernon (1996) studied ii groups of identical and nonidentical (fraternal) twins, one group in their 20s and the other grouping in their 50s, to determine the influence of genetics on personality. They found that genetics played a more than pregnant role in the older group of twins, suggesting that genetics became more significant for personality in later machismo.

Cantankerous-sectional studies accept a major advantage in that the scientist does not take to wait for years to pass to get results. On the other manus, the interpretation of the results in a cross-sectional report is non every bit clear as those from a longitudinal study, in which the same individuals are studied over time. Near important, the interpretations drawn from cross-sectional studies may be confounded past cohort furnishings. Cohort effects refer to the possibility that differences in cognition or behaviour at 2 points in time may exist caused past differences that are unrelated to the changes in age. The differences might instead be due to environmental factors that affect an unabridged age group. For instance, in the report by Jang, Livesley, and Vernon (1996) that compared younger and older twins, cohort effects might exist a trouble. The two groups of adults necessarily grew up in different fourth dimension periods, and they may take been differentially influenced by societal experiences, such equally economic hardship, the presence of wars, or the introduction of new engineering science. As a result, it is hard in cross-exclusive studies such as this one to make up one's mind whether the differences between the groups (e.g., in terms of the relative roles of environs and genetics) are due to historic period or to other factors.

Key Takeaways

• Babies are born with a diversity of skills and abilities that contribute to their survival, and they also actively learn past engaging with their environments.
• The habituation technique is used to demonstrate the newborn's ability to remember and learn from experience.
• Children use both assimilation and accommodation to develop performance schemas of the world.
• Piaget's theory of cognitive development proposes that children develop in a specific series of sequential stages: sensorimotor, preoperational, concrete operational, and formal operational.
• Piaget'due south theories have had a major impact, only they take also been critiqued and expanded.
• Social development requires the development of a secure base from which children feel free to explore. Zipper styles refer to the security of this base and more than by and large to the type of relationship that people, and particularly children, develop with those who are of import to them.
• Longitudinal and cantankerous-sectional studies are each used to test hypotheses virtually development, and each approach has advantages and disadvantages.

Exercises and Critical Thinking

1. Requite an instance of a situation in which you or someone else might show cognitive assimilation and cognitive accommodation. In what cases exercise you think each process is most likely to occur?
2. Consider some examples of how Piaget's and Vygotsky's theories of cognitive development might be used by teachers who are teaching young children.
3. Consider the attachment styles of some of your friends in terms of their relationships with their parents and other friends. Do y'all think their style is secure?

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Paradigm Attributions

Figure 7.2: Adapted from Wynn (1995).

Effigy 7.three: Jean Piaget by Anton Johansson, http://www.flickr.com/photos/mirjoran/455878802 used under CC BY 2.0 license (https://creativecommons.org/licenses/by/2.0/).

Figure 7.five: "Toddler in mirror" by Samantha Steele (http://www.flickr.com/photos/samanthasteele/3983047059/) is licensed under CC By-NC-ND 2.0 license (http://creativecommons.org/licenses/by-nc-nd/two.0/human activity.en_CA). At that place'due south a monkey in my mirror" by Mor (http://www.flickr.com/photos/mmoorr/1921632741/) is licensed under CC BY-NC 2.0 license (http://creativecommons.org/licenses/by-nc/2.0/deed.en_CA). "mirror mirror who is the most beautiful dog?" by rromer (http://www.flickr.com/photos/rromer/6309501395/) is licensed under CC BY-NC-SA 2.0 license (http://creativecommons.org/licenses/by-nc-sa/2.0/deed.en_CA).

Effigy vii.half dozen: Source: "Maternal Bond" by Koivth (http://en.wikipedia.org/wiki/File:MaternalBond.jpg) is licensed under the Artistic Commons Attribution-Share Alike 3.0 Unported (http://creativecommons.org/licenses/by-sa/three.0/deed.en_CA). "An beauteous dad" past Julien Harneis (http://world wide web.flickr.com/photos/julien_harneis/6342076964/in/photostream/) is licensed under CC By-SA ii.0 (http://creativecommons.org/licenses/by-sa/ii.0/act.en_CA). "Szymon i Krystian" past Joymaster (http://en.wikipedia.org/wiki/File:Szymon_i_Krystian_003.JPG) is licensed under the Creative Eatables Attribution-Share Alike 3.0 (http://creativecommons.org/licenses/past-sa/3.0/deed.en_CA).

Long Descriptions:

Figure 7.vii long clarification: Childrens' Attachment Styles. lx% are secure. 15% are disorganized. 15% are avoidant. 10% are ambivalent. [Return to Figure vii.7]

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