Psychological, Social, and Biological Foundations of Behavior covers psychology, sociology, and the biology underlying behaviour. It carries the heaviest terminology load on the exam, and it pairs that vocabulary with research-methods questions built on described studies.
Test Ninjas Research · Updated September 11, 2026
Psychological, Social, and Biological Foundations of Behavior — at a glance
Attribute
Value
Questions
59
Time
95 minutes
Passages
10
Discrete questions
15
Score range
118–132
What it covers
The AAMC publishes approximate content weightings for each section. They are a guide to where to spend review time rather than a guarantee about any individual test form.
Approximate content weighting
Area
Share of section
Psychology
~65%
Sociology
~30%
Biology
~5%
Topics that recur
Sensation, perception, and attention
Learning, memory, and cognition
Motivation, emotion, and stress
Identity, personality, and psychological disorders
Social cognition, attitudes, and group behaviour
Social structures, institutions, and stratification
Demographics, inequality, and healthcare access
Research methods, study design, and statistical reasoning
How to approach it
Terminology first, because it is the bottleneck
More than any other section, Psych/Soc rewards knowing precisely what a term means. Many questions are answerable in seconds if you recognise the concept and effectively unanswerable if you do not, because the distractors are neighbouring terms. This is the one section where flashcards genuinely earn their place.
Expect research methods throughout
A large share of passages describe a study and ask about its design: what the independent variable was, which confound threatens the conclusion, whether the sample supports the generalisation. Being comfortable with correlation versus causation, sampling bias, and basic statistical reasoning is worth as much here as the content itself.
Distinguish the psychological from the sociological
Many questions turn on the level of analysis: whether an explanation concerns an individual mind or a social structure. Answer choices frequently offer both, and picking correctly depends on noticing which level the question is asking about.
This section is scored 118–132, exactly like the other three, and contributes equally to your total. Work out what a change here does to your overall score with the MCAT score calculator.
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Sociology is roughly 30% of the Psych/Soc section, which makes it about 7-8% of the whole exam. It concentrates on social structures and institutions, stratification and inequality, demographic change, and how those shape health and access to healthcare.
The section assumes introductory-level coursework in both, and most students find one semester of each sufficient preparation. It is possible to cover the material through self-study, since the content is broad rather than deep, but the terminology load makes structured review important either way.
Because behaviour has a biological substrate. The roughly 5% of biology content here concerns the nervous and endocrine systems as they relate to behaviour — neurotransmitters, brain regions, hormonal influences on mood and stress — rather than repeating the Bio/Biochem material.
It is often the highest-scoring section, which is why it has that reputation, but that also means the percentile curve is unforgiving: because so many test takers score well, a few missed questions cost more percentile here than elsewhere. Treating it as a throwaway is a common and expensive mistake.