Why a Shared Vocabulary Matters
Psychology and behavioural science have produced a rich vocabulary for describing human experience — much of it now trickling into everyday conversation. Terms like cognitive dissonance and confirmation bias appear in news articles, workplace training sessions, and dinner-table debates. Yet their meanings are often fuzzy in popular use.
This reference clarifies the concepts you are most likely to encounter, drawing on definitions grounded in peer-reviewed research and mainstream clinical practice. For a deeper look at how mental shortcuts quietly shape our choices, see our guide to cognitive biases in everyday decisions.
| Field origin | Psychology formalised as a scientific discipline in the late 19th century (Wilhelm Wundt established the first experimental psychology laboratory in Leipzig in 1879) |
| Scope of behavioural science | Draws on psychology, economics, neuroscience, and sociology |
| Replication challenge | Roughly 50–60% of classic psychology findings replicated in large-scale re-tests (Open Science Collaboration, Science, 2015) |
| Applied settings | Concepts used in healthcare, policy, education, and workplace design |
| Cognitive biases catalogued | Researchers have identified well over 100 documented biases (Various meta-analyses in cognitive and social psychology) |
Core Terms Defined
The following glossary covers foundational ideas across cognitive, social, and developmental psychology. Each definition aims to be precise without being technical.
Cognitive Dissonance
The psychological discomfort that arises when a person holds two contradictory beliefs, or when their behaviour conflicts with their beliefs. People are motivated to reduce this discomfort, often by changing a belief or rationalising the behaviour.
Confirmation Bias
The tendency to search for, interpret, and remember information in a way that confirms one's pre-existing views. It operates largely below conscious awareness and affects judgement across many domains.
Fundamental Attribution Error
The widespread tendency to overestimate personal character as a cause of others' behaviour while underestimating situational factors. For example, assuming a colleague is lazy rather than overwhelmed.
Operant Conditioning
A learning process in which behaviour is shaped by its consequences — reinforced when followed by a reward, and weakened when followed by a punishment or no outcome. Associated with B.F. Skinner's experimental work.
Theory of Mind
The capacity to understand that other people have beliefs, desires, and intentions that differ from one's own. It typically develops in children around ages three to five and underpins much of social interaction.
Cognitive Load
The total amount of mental effort being used in working memory at any given moment. High cognitive load can impair decision-making, learning, and self-regulation.
Self-Efficacy
A person's belief in their own ability to execute the behaviours needed to achieve specific goals. Introduced by psychologist Albert Bandura, it influences motivation, resilience, and how people approach challenges.
Locus of Control
The degree to which individuals believe they — rather than external forces — control outcomes in their lives. Those with an internal locus attribute outcomes to their own actions; those with an external locus attribute them to luck or others.
Priming
A phenomenon in which exposure to one stimulus influences a response to a later, unrelated stimulus — often without conscious awareness. It is used to study how context shapes perception and judgement.
Social Desirability Bias
The tendency for survey respondents to answer questions in ways they believe will be viewed favourably by others, rather than reporting their true beliefs or behaviours. It is a persistent challenge in self-report research.
Heuristic
A mental shortcut or rule of thumb that allows quick judgements with minimal cognitive effort. Heuristics are generally adaptive but can produce systematic errors in certain contexts.
Attachment Theory
A framework, developed by John Bowlby and later extended by Mary Ainsworth, describing how early emotional bonds between children and caregivers shape patterns of relationship across the lifespan.
These concepts do not exist in isolation. Social psychology, for instance, shares territory with community sociology — if terms like social capital or collective efficacy interest you, the plain-language reference to community studies concepts covers that adjacent vocabulary in similar depth.
Similarly, several concepts — theory of mind in particular — are studied not only in humans. Key concepts in animal cognition explores how researchers apply related frameworks to non-human species.
These Are Descriptive Tools, Not Labels
Psychological terms describe patterns observed across populations — they are not diagnostic categories for judging individuals. Applying a term like 'fundamental attribution error' to a specific person's motives carries its own interpretive risks. Use these concepts as lenses for understanding, not as fixed character judgements. For personal mental health questions, always consult a qualified healthcare professional.
