IB DP Psychology Core: The Cognitive Approach to Understanding Behaviour

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.

This guide covers the Cognitive Approach to Understanding Behaviour, one of three compulsory core approaches for IB Diploma Programme Psychology, first assessment 2019. The full syllabus guide confirms all three core approaches – biological, cognitive, sociocultural – are compulsory for every student, tested on Paper 1, alongside the Biological Approach already on the site.

Where this fits in the syllabus

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 syllabus deliberately revisits shared topics across 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. The relevant cognitive concept is reconstructive memory – memory is not a video-like recording but an active reconstruction influenced by existing schema. Applied to the scenario, a witness’s account can be shaped by expectations, leading questions, or information encountered after the event, which become integrated into the “memory” without the witness being aware their recall has changed.

A named study supporting this: Loftus and Palmer (1974) showed participants film clips of car accidents, then asked how fast the cars were going when they “smashed into”, “collided with”, “bumped”, “hit” or “contacted” each other. The verb used in the question significantly affected participants’ speed estimates, and participants given the word “smashed” were also more likely to later (mis)report having seen broken glass that was not in fact present – a finding usually taken as evidence that post-event information (here, the wording of a question) can become integrated into a witness’s memory of the original event. A genuine evaluative point then follows: this cognitive explanation has real-world application (informing how police interviews are conducted, and the case for cognitive interview techniques that avoid leading questions) but is criticised for being difficult to test with full ecological validity, since lab studies using filmed clips rarely replicate the emotional intensity and personal stakes of witnessing a real event. Naming the specific study and 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, so a well-remembered study finding without a methodological or applied evaluation attached is only half-prepared.

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.

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, rather than blending explanations without saying which approach is doing the work.

How to approach it

Learn at least one cognitive study or model with its finding, methodology, and one evaluative point, rather than a finding in isolation. Practise distinguishing a cognitive explanation of a topic from a biological explanation of the same topic, and be ready to state explicitly which approach a given point belongs to. Apply the cognitive approach’s key concepts – schema, reconstructive memory, information-processing – to a novel scenario, not just a memorised study, since Paper 1 questions are frequently framed around an unseen context. As revision practice, work through at least one cross-approach comparison of the same topic: it sharpens which points belong to the cognitive approach, which is what a single-approach answer needs.

Common mistakes

Blending biological and cognitive explanations of the same topic (memory, for instance) 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.

Common cognitive approach studies

Alongside memory and reconstructive memory (Loftus and Palmer, 1974, above), this approach commonly draws on studies of schema theory – how prior knowledge structures shape what is noticed, encoded and recalled. A classic example is Bartlett (1932), whose “War of the Ghosts” studies had British participants repeatedly recall an unfamiliar Native American folk story over increasing delays; recalled versions became shorter, more conventional, and distorted towards details that fit participants’ own cultural schema, supporting the idea that remembering is an active reconstruction guided by existing knowledge rather than passive retrieval. An evaluative point: Bartlett’s method relied on qualitative analysis of free recall with limited standardisation by today’s standards, so later, more tightly controlled studies (including Loftus and Palmer’s) are often used to support the same underlying claim with better experimental control. This approach also draws on thinking and decision-making (including cognitive biases and heuristics that produce predictable errors in judgment), and cognitive processing in real-world contexts such as eyewitness testimony or decision-making under uncertainty. Because Paper 1 questions can be framed around any of these sub-areas, building a small bank of two or three well-prepared studies across different sub-areas – rather than one memory study revised in exhaustive depth – gives more flexibility to respond to whichever specific angle a question actually takes.

Official syllabus

International Baccalaureate Organization, Diploma Programme Subject Brief – Psychology, first assessment 2019 – the same source already cited by the full syllabus guide and the revision notes already on the site. Verified 2026-09-06.