Exhaustive Notes on Cognitive Development: Piaget and Vygotsky Theories

Course Announcements and Weekly Schedule

• Welcome Back: The lecturer has returned and will be teaching for the remainder of the semester.

• Presentation Assignment: Starting next week. Students are encouraged to check in regarding feelings about the assignment and use the professor's office hours on Friday if they have questions.

• Task Review: The peer review exercise was intended as an informal way to discuss studies and prepare for presentations.

• Current Week Overview:

  • Today: Overarching theories of cognitive development, specifically Piaget and Vygotsky.

  • Piaget Focus: In-depth review of the Sensory Motor Period, class inclusion, and scientific reasoning.

  • Vygotsky Focus: Cultural and linguistic impacts on development, the zone of proximal development, and a comparison with Piaget.

  • Tomorrow: Conceptual development, focusing on how children understand the biological world (biology) and cause and effect (causality).

• Assigned Readings:

  • Sections $5.1$ through $5.6$ in the textbook are particularly important for brushing up on Piaget.

  • The lecture on biology and causality (tomorrow) is less represented in the assigned textbook chapters.

Defining Cognitive Development

• Broader Context: Cognitive development is one branch of developmental study, alongside perceptual, physical, and emotional development.

• Core Topics in Cognition:

  • Thinking processes and problem solving.

  • Memory and learning.

  • Metacognition: How children think about their own thinking.

  • Attention and reasoning.

  • Self-control and language.

• The Developmental Approach:

  • Analysis: Pulling the mind apart to focus on specific topics like attention or perception.

  • Synthesis: Thinking about how all these aspects (social, emotional, physical, and cognitive) come together. Cognitive development does not happen in isolation.

Jean Piaget’s Theoretical Perspective

• Background: Piaget had a background in biology and was interested in how organisms and knowledge develop. He identified as a "genetic epistemologist."

• Central Question: How do humans go from being born with very little knowledge (reflexes) to being capable of complex reasoning (e.g., building rockets, commerce)?

• Three Theory Hallmarks:

  1. Constructivist: The child is an active participant, constructing knowledge and abilities through experience, building on basic building blocks like reflexes.

  2. Domain-General: Development reflects learning and reasoning mechanisms used for everything—physical world, language, social world, and numbers.

  3. Stage-Based: Children "level up" through discrete stages, focused on mastering major milestones before moving to the next level.

Mechanisms of Development in Piaget’s Theory

• Schemas: A child’s knowledge and ways of interacting with the world.

  • Example: A "looking schema" where a child learns to maintain fixation on an object despite head weight and weak neck muscles.

• Adaptation: The link between schemas and world experiences, involving three processes:

  1. Assimilation: Using existing schemas to make sense of new experiences (e.g., seeing a new animal and classifying it as a "dog").

  2. Accommodation: Updating or creating new schemas when existing ones don't fit (e.g., understanding a cell phone as a "phone" despite it lacking physical buttons found on older models).

  3. Equilibration: The balance between assimilation and accommodation to ensure an adaptive fit.

Piaget’s Stages of Development

• Sensory Motor Stage: Focused on self and object knowledge.

• Pre-operational Stage: Characterized by failing conservation tasks.

• Concrete Operational Stage: Passing concrete conservation tasks (e.g., reasoning about liquid volume in different glass shapes).

• Formal Operational Level: The highest level involving abstract, formal, and logical reasoning.

The Six Substages of the Sensorimotor Period ($0$ to $2$ Years)

• Substage 1: Reflexes ($0$ to $1$ Month):

  • Born with basic reflexes (e.g., palmar grasp reflex).

  • Children become more efficient at deploying these through learning.

  • No integration of information across senses (hearing, seeing, and feeling are separate).

  • Undifferentiated experience: No distinction between self and the external world.

• Substage 2: Primary Circular Reactions ($1$ to $4$ Months):

  • Primary: Focused on the infant’s own body.

  • Circular: Repetitive actions.

  • Reaction: Initially happening by chance.

  • Example: A child accidentally touches their hand to their toe, triggers a reflex, and repeats the action to learn about their body.

• Substage 3: Secondary Circular Reactions ($4$ to $9$ Months):

  • Secondary: Focused on external objects or entities.

  • Developing schemas for objects (e.g., a rattle). Child learns how to grasp, look at, mouth, and shake objects.

• Substage 4: Coordination of Secondary Circular Reactions ($9$ to $12$ Months):

  • Integrating separate schemas into a coherent representation (e.g., a rattle is something that feels, looks, and sounds a certain way).

  • Basic problem solving: The child can retrieve a toy from location $A$ in the $A$-not-$B$ task.

• Substage 5: Tertiary Circular Reactions ($12$ to $18$ Months):

  • Tertiary moves from acting on objects to acting on schemas themselves.

  • Actively exploring and playing with different ways of behaving to see what outcomes they generate.

  • Example: Interacting with a new cat more gently than a family cat to see the response.

• Substage 6: Beginning of Thought ($18$ to $24$ Months):

  • Evidence of insight and early symbolic thinking.

  • Early language development.

  • Creative problem solving: For example, pulling a tablecloth to bring an out-of-reach object closer.

Object Permanence through the Sensorimotor Substages

• Substage 1: No distinction between self and objects.

• Substage 2: Out of sight is out of mind.

• Substage 3: Child searches for an object if it is partially occluded.

• Substage 4: Searches for fully occluded objects but fails the $A$-not-$B$ task (searching at location $A$ even after seeing it moved to location $B$).

• Substage 5: Passes the $A$-not-$B$ task but fails the invisible displacement task (tracking an object hidden in a cup that is then moved).

• Substage 6: Passes the invisible displacement task; possesses an adult-like concept of object permanence.

Class Inclusion and Critiques of Piaget

• Class Inclusion Definition: A logical concept where subclasses are included in a whole class; the whole is greater than any one part.

• The Task:

  • "Are there more dogs or cats?" ($ ext{passed by kids aged } $4$ ext{ to } $7$).

  • "Are there more animals or dogs?" ($ ext{not passed until approx. } $9$ ext{ years old}$).

• Piaget’s Conclusion: Children have difficulty thinking across two levels of a logical hierarchy simultaneously.

• Modern Critiques:

  • Framing Matters: If the question is changed to "more in the family of frogs" versus "female frogs," children pass earlier.

  • Social Context: The $A$-not-$B$ failure might be due to the child thinking the experimenter is teaching them specifically about location $A$.

  • Conservation Task Critiques: Using a "naughty teddy" to move pennies (providing a reason for the change) helps children pass the conservation task at a younger age.

  • Experimenter Demand Effects: Children may change answers because they think the adult wants a different response after performing an action.

Scientific Reasoning in the Formal Operational Stage

• The Achievement: Representing the hypothetical-deductive method (forming hypotheses and deducing tests).

• The Pendulum Task:

  • Children must find factors affecting swing speed (string length, weight, release point, force).

  • Recognition vs. Production Gap: By $9$ years of age, children can recognize systematic scientific behavior in others but struggle to produce systematic interventions themselves until much later.

Lev Vygotsky’s Social Constructivism

• Perspective: Children are active constructivists but develop within social and cultural contexts. They learn through observation and feedback from more skilled individuals.

• Key Focus Areas: Language internalization and cultural tools.

• Rejection of Stages: Vygotsky questioned universal stages, arguing that development is messier and depends on cultural needs rather than a fixed biological order.

The Cultural Tools Metaphor

• Physical Tools: Cultures build tools for specific needs; these are passed down, refined, and taught to the next generation.

• Mental/Cultural Tools: Language, numerical systems, music, art, and meditative practices.

• Implications of the Metaphor:

  • Mental tools are acquired through "guided participation."

  • Usage of these tools is a skill developed over time through practice (like riding a bike).

  • Tools vary by culture: Different environments provide different tools for different needs.

  • Access vs. Use: Just because a mental tool exists doesn't mean a child will always use it (the production-recognition gap).

Zone of Proximal Development (ZPD)

• Definition: The "sweet spot" for development where a task is challenging but achievable.

• Success Rate: Vygotsky estimated this zone occurs when a child has roughly an $80\,$ success rate.

• Social Nature: The ZPD changes based on the availability of tools, coaches, and peer support.

• Example Case: A student succeeding at a physical task (clapping/jumping) when supported by a coach and cheered on by classmates.

Comparison: Piaget vs. Vygotsky (Figure $5.5$)

• Piaget:

  • Focus on biology and universal development.

  • Processes are essentially the same for human and non-human animals.

  • Mental operators (logical tools) develop internally as the child reaches certain levels.

• Vygotsky:

  • Focus on culture and social context.

  • Development is non-universal and depends on specific cultural tools.

  • Mental tools are internalized from the outside (social world) into the inside.

Questions & Discussion

• Question: If a baby hears a loud noise that startles them, wouldn't they know the noise caused it?

• Response: According to Piaget’s Substage 1, the baby likely wouldn't separate a loud noise from an internal signal like gas in their tummy. It is simply one undifferentiated "ball of experience."

• Question: Does Substage $5$ (Tertiary Circular Reactions) essentially seek problems to solve, or is it just gaining knowledge about creative approaches?

• Response: Substage $5$ is focused on actively exploring and playing with schemas. Substage $6$ moves toward symbolic thinking and abstraction, though they are a continuous progression.

• Question: Why do infants explore so much with their mouths?

• Response: Using the mouth is critical for feeding and is evolutionary; it is also a rich way to explore an object's density and texture early in development.