Cognitive approach - Psychology IB Study Notes

The cognitive approach in psychology studies mental processes—how we acquire, process, store, and retrieve information. It treats the mind as an information processor, analogous to a computer, examining thinking, memory, perception, and problem-solving.

Key Principles:

1. Internal Mental Processes can be studied scientifically through inference. While we cannot directly observe thoughts, we infer cognitive processes from behavior (e.g., response times, accuracy rates).

2. Schema Theory: Schemas are cognitive frameworks or mental representations that organize knowledge and guide perception. They help us interpret new information efficiently but can lead to stereotyping or memory distortions. Assimilation integrates new information into existing schemas; accommodation modifies schemas when new information doesn't fit.

3. Models of Memory: The Multi-Store Model (Atkinson & Shiffrin, 1968) proposes three separate stores: sensory memory (brief, capacity unlimited), short-term memory (15-30 seconds, 7±2 items), and long-term memory (potentially permanent, unlimited capacity). Information flows sequentially through rehearsal.

4. Cognitive Neuroscience combines cognitive psychology with brain imaging (fMRI, PET scans) to understand neural mechanisms underlying cognition.

Key Terms:

• Ecological validity: Extent to which findings generalize to real-world settings
• Cognitive bias: Systematic errors in thinking (e.g., confirmation bias)
• Top-down processing: Using prior knowledge/expectations to interpret stimuli
• Bottom-up processing: Building perception from sensory input

Cambridge Focus: Understand both strengths (scientific, practical applications) and limitations (ignores emotion, reductionist) of this approach for evaluation questions.

The Computer Analogy Explained:

Imagine your brain as a sophisticated computer. Input (sensory information) enters through your senses (keyboard/mouse), gets processed through mental operations (CPU), stored in memory systems (hard drive), and produces output (behavior/responses). This metaphor helps us understand complex mental processes systematically.

Real-World Application: Eyewitness Testimony

Schemas powerfully influence memory reconstruction. When witnessing a crime, your "robbery schema" (preconceived ideas about how robberies occur) can distort what you actually saw. Loftus & Palmer (1974) demonstrated this: participants shown a car accident estimated different speeds depending on verb choice ("smashed" vs. "contacted"). This has profound legal implications—innocent people may be convicted based on unreliable eyewitness accounts shaped by leading questions.

Everyday Example: Smartphone Navigation

Consider using GPS navigation. Initially, you rely on external processing (phone instructions). Over time, you develop cognitive maps—internal spatial representations. This demonstrates procedural memory (automatic, unconscious "knowing how") versus declarative memory (conscious "knowing that"). Expert taxi drivers show enlarged hippocampi (Maguire et al., 2000), proving cognitive training physically changes brain structure!

Education Application:

Understanding working memory capacity (Baddeley & Hitch's model with phonological loop, visuospatial sketchpad, central executive) explains why students struggle when information exceeds capacity. Teachers can chunk information into meaningful units (phone numbers: 07700-900-123 not 07700900123) or use dual-coding (combining verbal and visual information) to optimize learning.

Analogy: Schemas are like filing cabinets—they organize information efficiently but sometimes you file new documents in the wrong folder based on superficial similarities!