Developmental Psychology 350
Lecture 7
9-27-00
In general, children were encouraged to explore and use their environment to learn and discover things for themselves. They were shown the places that were tapu for them, such as cliff faces and reefs, in fact, anything that could be too difficult for them to cope with unaccompanied by adults.
Rangimarie Turuku Pere, Maori writer
Outline
Infant Learning & Cognition
Basic learning processes
Sensorimotor development
Mental representation
Memory
Theory of mind
Basic Learning Processes
Habituation
discriminates familiar from novel
shows surprise and expectancies
exps. = categorical speech perception, discriminating small quantities,
intermodal integration
Basic Learning Processes
Instrumental & operant conditioning
increase/decrease responding through positive or negative consequences
Classical conditioning
stimulus substitution based on contiguity
Basic Learning Processes
Contingency Awareness
controlling the environment vs
learned helplessness
Imitation
Innate??
learning novel responses
deferred imitation
Piagets Theory
Structures
Functions
Organization
Adaptation
Assimilation
Accommodation
Equilibration
Stages in Piagets Theory
Sensorimotor period - 0-2 yrs
Preoperational period - 2-6 yrs
Concrete operational period - 6-11 yrs
Formal operational period - 12-adult yrs
Factors in Stage Transitions
Maturation
Physical experience
Social experience
Equilibration
Six Sensorimotor Substages
Exercising reflexes - 0-1month
Developing schemes- 1-4 months
Discovering procedures - 4-8 months
Intentional behavior - 8-12 months
Novelty & exploration - 12-18 months
Mental representation - 18-24 months
Changes During the Sensorimotor Period
From To
reflexes --> controlled actions
nonverbal --> verbal
actions --> representations
discrete --> integrated
immediate --> deferred
trial & error --> hypothesis testing
1-4 months
repeated actions (primary circular reactions)
exploration of body
perceptual integration
eye-hand coordination
4-8 months
manipulates objects repeatedly
creep, crawl, climb to explore
visually-directed reaching
recognition memory helps establish:
object permanence
social attachment
8-12 months
communication by gesture & speech
stereotyped actions applied to new objects
A not B search error
self-awareness & self-recognition
intentionality shown by:
removal of obstacles to obtain goals
use of instruments as tools
12-18 months
exploration is systematic
greater focus on goal pursuit
uses tools in novel ways
18 - 24 months
greater use of symbols & signs
greater causal reasoning
inventive thinking shown by:
hypothesis testing
Insight
deception
mental representation
Mental representation shown by
Symbolic play
Object concept
Decreasing egocentrism
Language use
Searching behavior
Deferred imitation
Recall memory
Recall memory in infants
Traditional view = infantile amnesia
New view = recall memory at 12 months
Problem was methodological
Solution = elicited imitation of action sequences
Patricia Bauer (1996)
Method
Infant and E opposite each other at table
Props on table
E models sequence of actions
Infant asked to perform actions
Measures = accurate imitation
Bauers Findings - Immediate Recall of Modeled Actions
11 month olds imitate 2 step sequences
20 month olds imitate 3 step sequences
30 month olds imitate 8 step sequences
What about long-term recall?
Bauer presented action sequences to groups of 13, 16, & 20 month olds and tested
their recall 8 months later?
All infants had accurate imitation
Conclude: Good recall by 12 months and rapid improvement by age 2 years
What helps recall memory?
short delays
familiar events
enabling sequences
more repetitions of models actions
participation rather than passive viewing
available cues as reminders
available vocabulary to encode actions
Appearance-reality distinctions (Flavell)
2-3 year olds do not easily discriminate what things look like from what
things actually are
problem is dual nature of object and conflicting information
occurs in many cultures
resists simple training
similar to level 1 & 2 visual perspective taking
Shift from 2-3 yrs to 4-5 yrs
From To
copy theory --> constructed theory
encounter --> represented world
repository --> transformed
object-centered --> subject-centered
Childrens Emerging Theories
(Wellman & Gelman)
Naïve physics
Naïve biology
Naïve psychology
Emerging Theory of Mind (Wellman)
3-5 year olds distinguish real from imagined objects (i.e., physical vs mental)
3-5 year olds are not "realists" as Piaget claimed
3-5 yr olds construct causal-explanatory theory of the world based on:
beliefs-desires-intentions
Exp: False Belief Tasks
Call & Tomasello (CD,1999)
Q: Do children understand deception?
Method: Hiding-finding game with 4&5yr olds
Procedure: One adult hides a sticker underneath one of two containers. Second adult places marker on top of correct container. Then 3 phases: Pretest, Control trials, False-belief test
Control trials: Insure that child can follow visible and invisible displacements and ignore false marker by second adult
False Belief Task
Critical Test: When second adult left room, first adult switched containers. Child was asked,"Which container would second adult think contained the sticker?" i.e., Does the child know that the sticker is in one location but the second adult falsely believes it is in the other container?
Results: 4 yr olds did not understand that second adult would have a false belief but 5 yr olds did
False Beliefs
Same results when task was given in verbal and nonverbal format
Then the nonverbal task was modified (food instead of sticker) and administered to 9 great apes, 4 orangutans and 5 chimps .
Do they understand deception?
No
Exp: Childrens Biological Theories - Natural Kinds
Gelman: Do children form categories based on perceptual features or underlying similarities?
Task: Child sees 3 pictures such as: flamingo - bat - blackbird. Two look alike and two are conceptually alike
Child hears fact such as,"This bird gives its baby mashed-up food; this bat gives its baby milk."
Natural Kinds
Do children think the blackbird feeds its babies mashed-up food or milk?
4 year olds make inferences based on category membership, NOT perceptual similarity.
Effects found in 3 yr olds and without verbal labels and with many natural categories
Conclude: 3-4 yr olds establish categories for natural kinds and make inferences about them.
Conclusions
Piaget underestimated childrens knowledge
Recent research shows:
Causal reasoning about physical forces and perceptual expectancies
Understanding of the mental world, self and others, and
Categories of natural kinds, not classes of perceptually-similar things