Copyright © Allyn & Bacon 2007 Development Through the Lifespan Chapter 4 Physical Development in...

Copyright © Allyn & Bacon 2007

Development Through the LifespanDevelopment Through the Lifespan

Chapter 4

Physical Development inInfancy and Toddlerhood

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Chapter 4

Physical Development inInfancy and Toddlerhood

This multimedia product and its contents are protected under copyright law. The following are prohibited by law:

Any public performance or display, including transmission of any image over a network;

Preparation of any derivative work, including the extraction, in whole or in part, of any images;

Any rental, lease, or lending of the program.


Body GrowthBody Growth

Gain 50% in height from birth to age 1. 75% by age 2

Grow in spurts

Gain 50% in height from birth to age 1. 75% by age 2

Grow in spurts

Gain “baby fat” until about 9

months, then get slimmer

Girls slightly shorter and

lighter than boys.

Gain “baby fat” until about 9

months, then get slimmer

Girls slightly shorter and

lighter than boys.


Changes in Body ProportionsChanges in Body Proportions


Growth TrendsGrowth Trends

Cephalocaudal

“Head to Tail” Lower part of

body grows later than the head

Cephalocaudal

“Head to Tail” Lower part of

body grows later than the head

Proximodistal

“Near to far” Extremities grow

later than head, chest, and trunk

Proximodistal

“Near to far” Extremities grow

later than head, chest, and trunk


Major Milestones ofBrain DevelopmentMajor Milestones ofBrain Development


Methods for Measuring Brain FunctioningMethods for Measuring Brain Functioning

Functional magnetic resonance imaging (fMRI)

Positron emmission tomography (PET)

Functional magnetic resonance imaging (fMRI)

Positron emmission tomography (PET)

Electroencephalogram (EEG) Event-related potentials (ERPs)

Electroencephalogram (EEG) Event-related potentials (ERPs)


Regions of the Cerebral CortexRegions of the Cerebral Cortex


Lateralization of Cerebral CortexLateralization of Cerebral Cortex

Left Hemisphere Sensory information

and control of right side of body

Verbal abilities Positive emotion Sequential,

analytical processing

Left Hemisphere Sensory information

and control of right side of body

Verbal abilities Positive emotion Sequential,

analytical processing

Right Hemisphere Sensory information

and control of left side of body

Spatial abilities Negative emotion Holistic, integrative

processing

Right Hemisphere Sensory information

and control of left side of body

Spatial abilities Negative emotion Holistic, integrative

processing


Brain PlasticityBrain Plasticity

In infants and young children, parts of brain are not yet specialized

Recover better from brain injury Language recovers better

than spatial skills Still have some problems with

complex mental skills

Older children, even adults, have some plasticity

In infants and young children, parts of brain are not yet specialized

Recover better from brain injury Language recovers better

than spatial skills Still have some problems with

complex mental skills

Older children, even adults, have some plasticity


Sensitive Periods in Brain DevelopmentSensitive Periods in Brain Development

Experience-expectant growth Ordinary experiences “expected”

by brain to grow normally

Experience-dependent growth Additional growth as a result of

specific learning experiences

Experience-expectant growth Ordinary experiences “expected”

by brain to grow normally

Experience-dependent growth Additional growth as a result of

specific learning experiences

Stimulation is vital when brain is growing rapidlyStimulation is vital when brain is growing rapidly


Evidence of Sensitive Periods Evidence of Sensitive Periods


Changing States of ArousalChanging States of Arousal

Sleep moves to an adult-like night-day schedule during the first year.

Sleep needs decline from 18 to 12 hours a day by age 2.

Sleep moves to an adult-like night-day schedule during the first year.

Sleep needs decline from 18 to 12 hours a day by age 2.

More Americans are co-sleeping.

More Americans are co-sleeping.


Influences on Early GrowthInfluences on Early Growth

Heredity Nutrition

Breast v. Bottle Feeding Malnutrition Emotional Well-Being

Problems can cause nonorganic failure to thrive

Heredity Nutrition

Breast v. Bottle Feeding Malnutrition Emotional Well-Being

Problems can cause nonorganic failure to thrive


Benefits of BreastfeedingBenefits of Breastfeeding

Correct fat-protein balance Nutritionally complete More digestible Better growth Disease protection Better jaw and tooth

development Easier transition to solid food

Correct fat-protein balance Nutritionally complete More digestible Better growth Disease protection Better jaw and tooth

development Easier transition to solid food


MalnutritionMalnutrition

Types Consequences Marasmus Kwashiorkor Iron-deficiency anemia Food insecurity

Physical symptoms Growth and weight problems Poor motor development Learning, attention problems Passivity, irritability, anxiety


The Steps of Classical ConditioningThe Steps of Classical Conditioning


Operant Conditioning TermsOperant Conditioning Terms

Reinforcer Increases

probability of behavior occurring again Presenting

desirable stimulus Removing

unpleasant stimulus

Reinforcer Increases


desirable stimulus Removing

unpleasant stimulus

Punishment Reduces


unpleasant stimulus

Removing desirable stimulus

Punishment Reduces


unpleasant stimulus

Removing desirable stimulus


Using Habituation to Study Infant Memory & KnowledgeUsing Habituation to Study Infant Memory & Knowledge


ImitationImitation

Newborns have ability to imitate Reflex or voluntary capacity?

Mirror neurons offer biological explanation

Powerful means of learning

Helps facilitate positive relationships

Newborns have ability to imitate Reflex or voluntary capacity?

Mirror neurons offer biological explanation

Powerful means of learning

Helps facilitate positive relationships


Motor Development: Sequence and TrendsMotor Development: Sequence and Trends

Gross motor development Crawling, standing, and walking

Fine motor development Reaching and grasping

Sequence is fairly uniform, though individual rate of motor progress differs

Cephalocaudal and proximodistal trend

Gross motor development Crawling, standing, and walking

Fine motor development Reaching and grasping

Sequence is fairly uniform, though individual rate of motor progress differs

Cephalocaudal and proximodistal trend


Motor Skills as Dynamic SystemsMotor Skills as Dynamic Systems

Increasingly complex systems of action with each skill

Each new skill is joint product of:1. CNS development

2. Body’s movement capacity

3. Child’s goals

4. Environmental supports

Increasingly complex systems of action with each skill

Each new skill is joint product of:1. CNS development

2. Body’s movement capacity

3. Child’s goals

4. Environmental supports


Cultural Variations in Motor DevelopmentCultural Variations in Motor Development

Rates and patterns of development affected by: Early movement

opportunities Environmental

stimulation Child-rearing practices

Rates and patterns of development affected by: Early movement

opportunities Environmental

stimulation Child-rearing practices


Milestones of Reaching and GraspingMilestones of Reaching and Grasping Prereaching Reaching

With two hands, then one

Ulnar Grasp Adjust grip to object Move objects from hand to

hand

Pincer Grasp

Prereaching Reaching

With two hands, then one

Ulnar Grasp Adjust grip to object Move objects from hand to

hand

Pincer Grasp


Developments in HearingDevelopments in Hearing

4–7 month

sSense of musical phrasing

6–8 month

s

“Screen out” sounds from non-native languages

7–9 month

s

Recognize familiar words, natural phrasing in native language


Improvements in VisionImprovements in Vision

Supported by rapid maturation of eyes and visual centers in brain

Improvements 2 months: Focus and color

vision 6 months: acuity, scanning &

tracking 6–7 months: depth perception

Supported by rapid maturation of eyes and visual centers in brain

Improvements 2 months: Focus and color

vision 6 months: acuity, scanning &

tracking 6–7 months: depth perception


Milestones in Depth PerceptionMilestones in Depth Perception

3-4 weeks

Sensitivity to motion cues

2-3 months

Sensitivity to binocular cues

6-7 months

• Sensitivity to pictorial cues• Wariness of heights


Milestones in Pattern PerceptionMilestones in Pattern Perception

1 month

• Poor contrast sensitivity; prefer single, large simple patterns with high contrast

2-3 months

• Can detect detail in complex patterns• Scan internal features of patterns

4 months

Can detect patterns even if boundaries are not really present

12 months

Can detect objects even if two-thirds of drawing is missing


Contrast SensitivityContrast Sensitivity


Subjective Boundaries in Visual PatternsSubjective Boundaries in Visual Patterns


Scanning Human Face PatternsScanning Human Face Patterns


Milestones in Face PerceptionMilestones in Face Perception

Birth –1

month

Prefer simple, facelike pattern

2 – 4 months

• Prefer complex facial pattern to other complex patterns• Can distinguish strange from familiar faces• Prefer mother’s face over stranger

5 – 12 months

Can perceive emotional expressions on faces


Early Face PerceptionEarly Face Perception


Milestones in Intermodal PerceptionMilestones in Intermodal Perception

BirthDetect amodal sensory properties

3–4 month

s

Relate speech sounds to lip movement

4–6 month

s

Perceive unique face-voice pairings of unfamiliar adults


Differentiation Theory Differentiation Theory

Infants:1. Search for invariant features of the

environment.

2. Note stable relationships between features:

Visual patterns, intermodal relationships

3. Gradually detect finer and finer features:

differentiation

Infants:1. Search for invariant features of the

environment.

2. Note stable relationships between features:

Visual patterns, intermodal relationships

3. Gradually detect finer and finer features:

differentiation

Copyright © Allyn & Bacon 2007 Development Through the Lifespan Chapter 4 Physical Development in...

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