IB DP Psychology Core: The Cognitive Approach to Understanding Behaviour – Revision Notes

Course note (legacy syllabus): This resource describes IB DP Psychology for first assessment 2019, now in its final teaching cycle (last examination session November 2026). A replacement course (first assessment 2027) reworks the approaches into content areas applied across four contexts, integrated with six named concepts – a rescoping this file has not undergone. A companion resource for the 2027 course does not yet exist on this site.

The full syllabus guide confirms all three core approaches – biological, cognitive, sociocultural – are compulsory for every student. These notes cover the Cognitive approach, alongside the Biological approach revision notes already on the site.

What the cognitive approach studies

How mental processes – memory, perception, thinking, decision-making – shape behaviour. Unlike the biological approach’s focus on physiology, the cognitive approach models the mind’s internal information-processing, often using computer-like models (input, processing, storage, output) as a way of representing mental activity that cannot be directly observed.

The same topic, three approaches

The syllabus guide’s key point: many topics are studied from more than one approach, and memory is the clearest example. Biologically, memory is examined through brain structures and neurochemistry. Cognitively, memory is examined through information-processing models (encoding, storage, retrieval) and factors affecting accuracy (such as reconstructive memory and schema). A strong Paper 1 answer recognises which approach a question is asking for, and does not blend biological and cognitive explanations together without being explicit about which is doing the explanatory work.

Worked example: applying the cognitive approach to memory reliability

A question asks candidates to use the cognitive approach to explain why eyewitness testimony can be unreliable.

Named study:         Loftus and Palmer (1974) -- participants watched
                     filmed car accidents, then estimated speed using
                     a question worded with one of five verbs (e.g.
                     "smashed" vs "hit"). Speed estimates rose with
                     more intense verbs, and "smashed"-group
                     participants were more likely to later
                     misremember seeing broken glass that was not
                     present.
Cognitive concept:   reconstructive memory -- memory is not a
                     video-like recording but an active reconstruction
                     influenced by existing schema
Application:         a witness's account can be shaped by
                     expectations, leading questions, or information
                     encountered after the event (here, the verb used
                     in a question), which become integrated into the
                     "memory" without the witness being aware their
                     recall has changed
Evaluation point:    this cognitive explanation has real-world
                     application (informing how police interviews are
                     conducted) but is criticised for being difficult
                     to test with full ecological validity, since a
                     filmed clip rarely replicates the emotional
                     intensity of witnessing a real event

Naming the study and the specific cognitive concept, applying it directly to the scenario, then adding a genuine evaluative point is the structure Paper 1’s essay question rewards.

Building evaluation into every study

For every cognitive study or model learned, prepare not just its finding but its methodology and one evaluative point (a strength or limitation of how it was conducted or how applicable its model is to real-world behaviour) – Paper 1’s essay question specifically credits evaluation, not just accurate description.

Cognitive approach across the options too

The cognitive approach’s concepts do not stop being relevant once the core is finished — several options draw on cognitive explanations directly. Developmental psychology, for example, often uses cognitive models to explain how thinking and problem-solving change across the lifespan, and health psychology draws on cognitive concepts such as risk perception and health beliefs to explain behaviour change. Recognising where your chosen option overlaps with core cognitive content lets you reuse and deepen the same underlying knowledge rather than treating the core and the option as fully separate bodies of content to learn from scratch.

Linking to the internal assessment

Because the cognitive approach emphasises information-processing and the influence of factors like schema on judgment, many students design their experimental study (internal assessment) within this approach — for example, testing how a manipulated variable affects recall or decision-making. If your own IA sits within the cognitive approach, use this same vocabulary (encoding, schema, information-processing) to justify your design choices and discuss your findings, since consistency between your taught content and your own research strengthens the write-up’s methodological grounding.

Common mistakes

Blending biological and cognitive explanations of the same topic (e.g. memory) without being explicit about which approach a given point belongs to. Describing a cognitive model’s structure without applying it to a specific scenario or study finding. Treating research methodology, tested separately in Paper 3, as irrelevant to a cognitive-approach essay, when strong answers often reference how a study’s method affects how much its findings can be trusted.

A second named study: schema theory

Alongside Loftus and Palmer above, Bartlett (1932) is a classic schema-theory study: British participants repeatedly recalled an unfamiliar Native American folk story (“The War of the Ghosts”) over increasing delays. Recalled versions grew shorter and were distorted towards details that fitted participants’ own cultural expectations, supporting reconstructive memory as an active process guided by existing schema rather than passive, accurate retrieval. Evaluation point: Bartlett’s method relied on qualitative analysis of free recall with limited standardisation by later experimental standards, so more tightly controlled studies such as Loftus and Palmer’s are often used to support the same underlying claim with stronger experimental control.

Quick revision checklist

• Learn at least one cognitive study or model with its finding, methodology, and one evaluative point – for example, Loftus and Palmer (1974) or Bartlett (1932), above.
• Practise distinguishing a cognitive explanation of a topic from a biological explanation of the same topic.
• Apply the cognitive approach’s key concepts (schema, reconstructive memory, information-processing) to a novel scenario, not just a memorised study.

Comparing approaches as a revision tool

Comparing how two approaches explain the same behaviour is a revision tool, not an essay format: the Paper 1 essay is answered from a single approach, with no separate credit for bringing in a second (see the exam preparation notes). Working through one comparison in advance — for example, memory explained cognitively (information-processing, reconstructive memory) versus biologically (brain structures, neurochemistry) — still pays off, because it trains you to recognise which approach a question is asking for and to keep your answer within it.

Self-test

1. What distinguishes the cognitive approach’s focus from the biological approach’s?
2. What does “reconstructive memory” mean?
3. Why must a strong Paper 1 answer be explicit about which approach it is using?
4. What two things, beyond a study’s finding, should be prepared for every cognitive study?
5. Which paper specifically tests approaches to researching behaviour, separately from content?

Answers: 1. The cognitive approach focuses on internal mental processes (memory, perception, thinking); the biological approach looks at the relationship between the brain and behaviour, hormones and pheromones, and genetics (with the role of animal research added at HL). 2. That memory is an active reconstruction shaped by existing schema and later information, not an accurate recording of the original event. 3. Because many topics (such as memory) can be explained from more than one approach, and blending them without distinction produces an unclear, unfocused answer. 4. Its methodology and at least one genuine evaluative point (a strength or limitation). 5. Paper 3.