santrock essentials 3e_ppt_ch03
TRANSCRIPT
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PHYSICAL AND COGNITIVE DEVELOPMENT IN INFANCY
3
ESSENTIALS OF LIFE-SPAN DEVELOPMENTJOHN W. SANTROCK
3e
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CHAPTER OUTLINE
• Physical growth and development in infancy• Motor development• Sensory and perceptual development• Cognitive development• Language development
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PHYSICAL GROWTH AND DEVELOPMENTIN INFANCY
• Patterns of growth• Height and weight• The brain• Sleep• Nutrition
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PATTERNS OF GROWTH
• Cephalocaudal pattern: Sequence in which the earliest growth always occurs at the top• Physical growth and differentiation of features work their
way down from top to bottom
• Proximodistal pattern: Sequence in which growth starts at the center of the body and moves toward the extremities
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3-5
HEIGHT AND WEIGHT
• The average American newborn is 20 inches long and weighs 7 pounds• Most of the newborns are 18 to 22 inches long and
weigh between 5 and 10 pounds• Grow about 1 inch per month during the first year• By 2 years of age• Infants weigh approximately 26 to 32 pounds• Average 32 to 35 inches in height
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3-6
THE BRAIN
• Contains tens of billions of nerve cells at birth• Shaken baby syndrome - Brain swelling and
hemorrhaging
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THE BRAIN
• Brain’s development• Mapping the brain• Brain has two halves• Lateralization: Specialization of function in one hemisphere of
the cerebral cortex or the other
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FIGURE 3.2 - THE BRAIN’S FOUR LOBES
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FIGURE 3.3 - THE NEURON
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THE BRAIN
• Changes in neurons• Myelination• Connectivity among neurons increases
• Changes in regions of the brain• Blooming and pruning vary by brain region• Peak of synaptic overproduction in the visual cortex followed by
a gradual retraction• Heredity and environment influence the timing and course
• Pace of myelination varies
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FIGURE 3.4 - DENDRITIC SPREADING
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FIGURE 3.5 - SYNAPTIC DENSITY IN THE HUMAN BRAIN FROM INFANCY TO ADULTHOOD
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THE BRAIN
• Early experience and the brain• Children in deprived environment may have depressed
brain activity• Brain demonstrates both flexibility and resilience
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FIGURE 3.6 - PLASTICITY IN THE BRAIN’S HEMISPHERES
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THE BRAIN
• Neuroconstructivist view:• Biological processes and environmental conditions
influence the brain’s development• Brain has plasticity and is context dependent• Development of the brain and the child’s cognitive
development are closely linked
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SLEEP
• Typical newborn sleeps 16 to 17 hours a day• Infant sleep-related problem - Night-time waking • REM sleep - Rapid eye movement sleep• Infants spend about half of their sleep time in REM sleep• Often begin sleep cycle with REM sleep rather than non-
REM sleep
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SLEEP
• Sudden infant death syndrome (SIDS): Occurs when an infant stops breathing, usually at night• Suddenly dies without an apparent cause
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SIDS - FINDINGS
• Occurs mostly in infants with abnormal brain stem functioning involving serotonin • More likely to occur:• In low birth weight infants• In African American and Eskimo infants• In infants passively exposed to cigarette smoke• When infants and parents share the same bed• When infants use a pacifier when they go to sleep• When infants sleep in a bedroom with a fan
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NUTRITION
• Breast versus bottle-feeding• Breast feeding is better
• Benefits of breast feeding - Outcomes for the child• Appropriate weight gain • Lowered risk of childhood obesity • Fewer gastrointestinal infections• Fewer lower respiratory tract infections
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NUTRITION
• Benefits of breast feeding - Outcomes for the mother• Lower incidence of breast cancer• Reduction in ovarian cancer
• Mother should not breast feed if:• Infected with HIV or some other infectious disease• She has active tuberculosis• She is taking any drug that is not safe for the infant
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NUTRITION
• Nutritional needs• Are individual among infants• Adequate early nutrition is an important aspect of healthy
development
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MOTOR DEVELOPMENT
• The Dynamic Systems view• Reflexes• Gross motor skills• Fine motor skills
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DYNAMIC SYSTEMS THEORY
• Infants assemble motor skills for perceiving and acting• Perception and action are coupled together
• Motor skill is developed by:• Development of the nervous system• Body’s physical properties and its possibilities for movement• Goal the child is motivated to reach• Environmental support for the skill
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REFLEXES
• Built-in reactions to stimuli• Govern the newborn’s movements • Genetically carried survival mechanisms that are automatic
and involuntary
• Rooting reflex - Occurs when the infant’s cheek is stroked or the side of the mouth is touched• Turns his or her head in an effort to find something to suck
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REFLEXES
• Sucking reflex - Occurs when newborns automatically suck an object placed in their mouth• Enables newborns to get nourishment before they have
associated a nipple with food
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REFLEXES
• Moro reflex - Occurs in reaction to a sudden, intense noise or movement• Believed to be a way of grabbing for support while falling
• Grasping reflex - Occurs when something touches the infant’s palms• Responds by grasping tightly
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GROSS MOTOR SKILLS
• Involve large-muscle activities• Such as moving one’s arms and walking
• Newborn infants cannot voluntarily control their posture • Locomotion and postural control are closely linked,
especially in walking upright
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FIGURE 3.9 - MILESTONES IN GROSS MOTOR DEVELOPMENT
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GROSS MOTOR SKILLS
• Development in the second year• Toddlers become more mobile are motor skills are honed• By 13-18 months• Toddlers can pull a toy or climb stairs
• By 18-24 months• Toddlers can walk quickly• Balance on their feet• Walk backward and stand and kick a ball
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FINE MOTOR SKILLS
• Involve more finely tuned movements• Grasping a toy, using a spoon, buttoning a shirt, or anything
that requires finger dexterity
• Infants need to exercise their fine motor skills • Pincer grip
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SENSORY AND PERCEPTUAL DEVELOPMENT
• Exploring sensory and perceptual development• Visual perception• Other senses• Intermodal perception• Nature, nurture, and perceptual development• Perceptual motor coupling
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EXPLORING SENSORY AND PERCEPTUAL DEVELOPMENT
• Sensation: Occurs when information interacts with sensory receptors• Eyes, ears, tongue, nostrils, and skin
• Perception: Interpretation of what is sensed
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EXPLORING SENSORY AND PERCEPTUAL DEVELOPMENT
• Ecological view• Directly perceives information that exists in the world
around us
• Studying the infant’s perception• Visual preference method: Studying whether infants can
distinguish one stimulus from another by measuring the length of time they attend to different stimuli
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FIGURE 3.11 - FANTZ’S EXPERIMENT ON INFANTS’ VISUAL PERCEPTION
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EXPLORING SENSORY AND PERCEPTUAL DEVELOPMENT
• Habituation and dishabituation• Habituation: Name given to decreased responsiveness to a
stimulus after repeated presentations of the stimulus• Dishabituation: Recovery of a habituated response after a
change in stimulation
• Equipment• Technology can facilitate the use of most methods for
investigating the infant’s perceptual abilities
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FIGURE 3.13 - VISUAL ACUITY DURING THE FIRST MONTHS OF LIFE
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VISUAL PERCEPTION
• Perceptual patterns• Even 2- to 3-week-old infants prefer to look at patterned
displays rather than at nonpatterned displays
• Perceiving occluded objects• Depth perception
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FIGURE 3.14 - INFANTS’ PREDICTIVE TRACKING OF A BRIEFLY OCCLUDED MOVING BALL
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FIGURE 3.15 - EXAMINING INFANTS’ DEPTH PERCEPTION ON THE VISUAL CLIFF
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OTHER SENSES
• Hearing• Changes in hearing • LoudnessOther Senses• Pitch• Localization
• Touch and pain• Smell• Taste
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INTERMODAL PERCEPTION
• Involves integrating information from two or more sensory modalities• Vision and hearing• Most perception is intermodal
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NATURE, NURTURE, AND PERCEPTUAL DEVELOPMENT
• Nativists - Emphasize nature• Empiricists - Emphasize learning and experience
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PERCEPTUAL MOTOR COUPLING
• Perception and action are not isolated but rather are coupled• Individuals perceive in order to move and move in
order to perceive
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COGNITIVE DEVELOPMENT
• Piaget’s theory• Learning, remembering, and conceptualizing
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PIAGET’S THEORY
• Processes of development• Schemes: Actions or mental representations that organize
knowledge• Behavioral scheme• Mental scheme
• Assimilation: Using existing schemes to deal with new information or experiences
• Accommodation: Adjusting schemes to fit new information and experiences
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PIAGET’S THEORY
• Organization: Grouping of isolated behaviors and thoughts into a higher-order system
• Equilibration and stages of development• Equilibration: Mechanism by which children shift from one stage
of thought to the next• Individuals go through four stages of development
• Cognition is qualitatively different from one stage to another
• Sensorimotor stage: Lasts from birth to about age 2• Object permanence: Understanding that objects and
events continue to exist:• When they cannot directly be seen, heard, or touched
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FIGURE 3.17 - OBJECT PERMANENCE
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EVALUATING PIAGET’S SENSORIMOTOR STAGE
• A-not-B error: Tendency of infants to reach where an object was located earlier rather than where the object was last hidden• Older infants are less likely to make the A-not-B error
because their concept of object permanence is more complete
• Core knowledge approach: States that infants are born with domain-specific innate knowledge systems
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LEARNING, REMEMBERING, AND CONCEPTUALIZING
• Operant conditioning• If an infant’s behavior is followed by a rewarding stimulus,
the behavior is likely to recur
• Attention: • Focusing of mental resources on select information• Habituation and dishabituation closely linked• Joint attention: Requires • Ability to track another’s behavior• One person’s directing another’s attention
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LEARNING, REMEMBERING, AND CONCEPTUALIZING
• Reciprocal interaction• Imitation• Involves flexibility and adaptability• Deferred imitation: Occurs after a delay of hours or days
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LEARNING, REMEMBERING, AND CONCEPTUALIZING
• Memory• Involves retention of information over time• Implicit memory: Without conscious recollection• Explicit memory: Conscious remembering of facts and
experiences
• Childhood amnesia - Most adults can remember little, if anything, from the first 3 years of their life
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LEARNING, REMEMBERING, AND CONCEPTUALIZING
• Concept formation and categorization• Concepts: Cognitive groupings of similar objects, events,
people, or ideas• Perceptual categorization• Conceptual categorization
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LANGUAGE DEVELOPMENT
• Defining language• How language develops• Biological and environmental influences
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DEFINING LANGUAGE
• Language: Form of communication• Spoken, written, or signed• Based on a system of symbols • Consists of the words used by a community and the rules for
varying and combining them
• Infinite generativity - Ability to produce an endless number of meaningful sentences using:• Finite set of words and rules
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HOW LANGUAGE DEVELOPS
• Babbling and gestures• Crying• Cooing• Babbling• Showing and pointing
• Recognizing language sounds
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HOW LANGUAGE DEVELOPS
• First words• Infancy receptive vocabulary considerably exceeds
spoken vocabulary • Receptive vocabulary - Words the child understands • Spoken vocabulary - Words the child uses• Vocabulary spurt
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FIGURE 3.23 - VARIATION IN LANGUAGE MILESTONES
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HOW LANGUAGE DEVELOPS
• Two-word utterances• To convey meaning child relies on:• Gesture, tone, and context
• Telegraphic speech: Use of short and precise words without grammatical markers:• Articles, auxiliary verbs, and other connectives
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BIOLOGICAL INFLUENCES
• Regions involved in language• Broca’s area - In the brain’s left frontal lobe that is involved
in speech production• Wernicke’s area - In the brain’s left hemisphere that is
involved in language comprehension
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FIGURE 3.25 - BROCA’S AREA AND WERNICKE’S AREA
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BIOLOGICAL INFLUENCES
• Language acquisition device (LAD): Chomsky’s term that describes a biological endowment enabling the child to:• Detect the features and rules of language, including
phonology, syntax, and semantics
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ENVIRONMENTAL INFLUENCES
• Behaviorist view of language learning has several problems• Does not explain how people create novel sentences• Children learn the syntax of their native language even if
they are not reinforced for doing so
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ENVIRONMENTAL INFLUENCES
• Vocabulary development is linked to:• Family’s socioeconomic status • Type of talk that parents direct to their children
• Child-directed speech: Language spoken in a higher pitch than normal, using simple words and sentences
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ENVIRONMENTAL INFLUENCES
• Three strategies to enhance child’s acquisition of language:• Recasting• Expanding• Labeling
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INTERACTIONIST VIEW
• Biology and experience contribute to language development