The information processing approach to cognitive development explains cognitive growth not through qualitative stage transitions (Piaget) but through quantitative improvements in basic processing mechanisms: increases in processing speed, working memory capacity, and executive function efficiency. Robert Kail demonstrated that processing speed increases exponentially throughout childhood and adolescence, following the same mathematical function across diverse tasks. These improvements in basic mechanisms enable increasingly complex cognitive operations.
Key Structures
- Prefrontal cortex (executive control) — The anterior portion of the frontal lobe, critical for executive functions including planning, decision-making, working memory, and cognitive control.
- Parietal cortex (processing speed) — The cortical region between frontal and occipital lobes, integrating sensory information for spatial representation and attention, particularly in relation to processing speed.
- White matter tracts (myelination) — Myelinated axon bundles connecting brain regions, enabling rapid long-distance neural communication, particularly in relation to myelination.
- Working Memory — A limited-capacity system for temporarily holding and manipulating information during complex cognitive tasks such as reasoning, comprehension, and learning.
Key Functions
Explains cognitive development through age-related improvements in processing speed, working memory capacity, attention control, and strategy use, analogizing the mind to a computer system.
Key Changes
Processing speed approximately doubles from age 5 to adulthood. Working memory capacity increases from approximately 2 items at age 5 to 4-5 items in adulthood. Encoding and retrieval strategies become more efficient and deliberate. Executive functions — inhibition, shifting, and updating — show protracted development through adolescence, reflecting the slow maturation of the prefrontal cortex.
Neo-Piagetian theories (Robbie Case, Kurt Fischer, Graeme Halford) bridge Piaget's stage theory and the information processing approach. They retain the idea of qualitative developmental stages but explain stage transitions through increases in working memory capacity and processing efficiency rather than through general logical structures. As WM capacity grows, children can coordinate more dimensions of a problem simultaneously, enabling qualitatively more complex reasoning.
Disorders
- ADHD (processing deficits) — Attention-Deficit/Hyperactivity Disorder — a neurodevelopmental condition characterized by persistent patterns of inattention, hyperactivity, and impulsivity affecting cognitive functioning.
- Intellectual disability (reduced processing speed) — Significant limitations in both intellectual functioning and adaptive behavior originating during the developmental period, studied through the lens of cognitive processes.
- Learning disabilities — Neurodevelopmental conditions affecting the acquisition of reading, writing, or mathematical skills despite adequate intelligence and instruction.