Behavioural Science Explained

The hard–easy effect is a cognitive bias where individuals overestimate success in difficult tasks and underestimate it in easy ones . It is typically identified via calibration curves , where subjective confidence is plotted against the actual proportion of correct responses. The sources explore this phenomenon across diverse domains: animal learning (including brightness, auditory, and flavor di...

The halo effect is defined as a cognitive bias where a positive overall impression of an entity, such as a person, company, or brand, influences one’s feelings or opinions about that entity in unrelated areas. It is essentially the inability to evaluate individual attributes separately from a general impression, leading to trait ratings that are more highly intercorrelated than objective measureme...

Attribution errors are cognitive biases that systematically affect how individuals explain the causes of behaviour and events, often leading to inaccurate or unjust assessments. The most foundational of these is the Fundamental Attribution Error (FAE) , also referred to as the correspondence bias, which is the tendency to overemphasize dispositional or personality-based explanations for others’ be...

Functional fixedness is a cognitive bias originating in Gestalt psychology, defined as the inability to repurpose an object for any use other than its original or traditional function, thereby negatively impacting problem solving when a novel use is required. Misleading functional knowledge is considered to be at the core of this bias . Seminal research, beginning with Duncker's Candle Box pro...

The Frequency Illusion , also known as the Baader-Meinhof phenomenon , is a cognitive bias wherein a person notices a specific concept, word, or item far more frequently shortly after recently becoming aware of it. This illusion is not due to an objective increase in the phenomenon, but rather a result of heightened awareness. It operates through two primary psychological processes: selective atte...

The empathy gap is a psychological bias where individuals struggle to accurately predict or understand the emotions and behaviors of others, or their own future selves, when in different emotional or visceral states. It is often defined as the hot-cold empathy gap , which contrasts states influenced by intense emotions like anger, pain, or hunger ("hot") with calm, rational states (&quot...

Effort justification is a psychological phenomenon where individuals enhance the perceived value of an achievement or outcome after investing significant effort, trouble, or pain to obtain it. This concept is deeply rooted in cognitive dissonance theory , pioneered by Leon Festinger (1957), which posits that individuals are motivated to reduce psychological discomfort arising from inconsistencies...

The denomination effect is a cognitive bias where individuals are less likely to spend money in large bills compared to an equivalent amount in smaller denominations or coins. Larger bills are often overvalued, acting as a self-control mechanism to deter spending, as people are reluctant to "break" them and lose track. Smaller units are undervalued and spent readily. Priya Raghubir and Joydeep Sri...

The defensive attribution hypothesis describes an observer's tendency to attribute causes for a mishap in a way that minimises their fear of becoming a victim or being responsible in a similar situation. It stems from discomfort with the idea that negative events can happen randomly, prompting a search for a controllable cause. This bias helps individuals avoid the threat of future harm or bla...

Declinism is the belief that a society or institution is tending towards decline, characterised by viewing the past more favourably and the present or future more negatively due to cognitive biases like rosy retrospection. Historically, this concept is traced to Edward Gibbon's History of the Decline and Fall of the Roman Empire , which posited a loss of civic virtue, and Oswald Spengler's The Dec...

The Curse of Knowledge (CoK) is a cognitive bias that occurs when individuals, having acquired knowledge, find it difficult to imagine what it's like not to know it, erroneously assuming others share their level of understanding. This creates a significant barrier to effective communication and knowledge sharing, especially for experts and educators. The sources extensively cover this phenomen...

Cue-dependent forgetting , also known as retrieval failure , is the inability to recall information because the appropriate retrieval cues are absent, even though the memory trace itself is still available in storage. Tulving and Pearlstone (1966) introduced the distinction between availability (information stored) and accessibility (information made retrievable). Research consistently supports th...

The Cross-Race Effect (CRE) is a well-established phenomenon where individuals demonstrate superior accuracy in recognising faces from their racial group compared to those from other races . This has significant implications for eyewitness identification accuracy in legal contexts. Research from various sources indicates that the CRE stems from complex mechanisms: • Perceptual expertise models sug...

The contrast effect is a cognitive bias where the perception or judgment of a stimulus is influenced by the presence of other, contrasting stimuli, often leading to an exaggeration of perceived differences. This pervasive phenomenon impacts various domains, influencing how experiences are interpreted and decisions are made. Key learnings from the sources include: • Sensory and Physiological: In ne...

Contagion is the spontaneous spread of emotions, behaviours, or conditions within a group or network, often occurring unconsciously. Important learnings include:• Emotional contagion involves automatic mimicry of others' expressions, postures, and vocalizations, influencing one's own emotional state. This can be positive (e.g., joy) or negative (e.g., anxiety), impacting workplaces, social...

Commitment and self-consistency bias refers to the idea that people assume less change in their attitudes and beliefs than actually occurs. Also known as consistency bias, it means believing one’s past and present attitudes are similar, despite attitudes, beliefs, and behaviours often changing more than we realise. This bias is identified as one of Daniel L. Schacter’s 'seven sins of memory&#3...

Conservatism in belief revision is defined as the human tendency to cling to prior beliefs or initial impressions, often revising views less than normatively predicted, even when presented with new, contradictory evidence. This bias explains why changing deeply held views or values is so difficult for people. We cover the ongoing debate between foundations and coherence theories of belief revision...

Congruence bias is the tendency for people to over-rely on testing their initial hypothesis (the most congruent one) while neglecting to test alternative hypotheses. This means individuals rarely attempt experiments that could disprove their initial belief, instead opting to repeat initial results. It is a special case of confirmation bias, where people seek information that confirms existing beli...

Confabulation is generally defined as the unintentional production of false, distorted, or displaced memories or statements about oneself or the world, which the individual sincerely believes to be true, often filling gaps in memory. These statements can range from plausible distortions to bizarre or fantastic narratives. Confabulation is frequently observed in patients with organic amnesia, and i...

The clustering illusion is a cognitive bias that leads individuals to mistakenly perceive non-random patterns or trends in truly random data or events. This common phenomenon is rooted in the innate human tendency to seek order and predictability in the world, causing the brain to find connections even where none exist. It arises because people tend to underestimate the natural variability that is...

Choice-supportive bias is a cognitive bias that compels individuals to justify their decisions, often by retroactively attributing positive qualities to chosen options and downplaying rejected ones. This fascinating aspect of human psychology helps us avoid cognitive dissonance—the mental discomfort arising from conflicting beliefs—and maintain a positive self-image. The bias shapes perceptions th...

The cheerleader effect describes how an individual is perceived as more attractive when seen within a group than in isolation. Popularised by How I Met Your Mother , this robust effect shows an average attractiveness increase of 1.5%–2.0% and has been replicated across various cultures, including collectivist societies like China. Proposed mechanisms include: •Automatic ensemble averaging, where t...

The bizarreness effect is a psychological phenomenon defined as the increased likelihood of people remembering information that is strange or unusual compared to information that is mundane or expected. This effect has a significant impact on memory recall. Memory training experts have long advocated associating information with bizarre imagery to improve recall. The effect typically occurs when b...

The bias blind spot (BBS) is a phenomenon where individuals are less likely to detect bias in themselves than in others. People typically believe they are, on average, less biased than their peers. This "metabias" or "cognitive blind spot" is rooted in naïve realism – the belief that one's own perceptions are objective. Consequently, people tend to attribute differing views...

The base rate fallacy is a cognitive bias where individuals overvalue specific information and ignore the general prevalence (base rate) of an event, leading to misjudgments about likelihoods. It suggests people overlook how common or rare something is, favouring new, seemingly relevant details. This phenomenon has been extensively studied, notably by Kahneman and Tversky, who attributed it to heu...