Study Notes on Heuristics and Cognitive Biases

The Representativeness Heuristic in Cognitive Judgment

The representativeness heuristic is a mental shortcut and cognitive process where people make judgments about the probability or nature of an object, person, or event based on how closely it matches a pre-existing internal stereotype or a prior expectation. In this decision-making framework, individuals evaluate the characteristics of a subject and compare them to the "typical" prototype of a category they already possess in their memory. If the subject is perceived as being highly representative of that category, the individual will judge it as belonging to that group or as being likely to occur, often failing to consider base rates, statistical logic, or conflicting evidence. This heuristic guides human intuition by substituting complex probability assessments with simple similarity comparisons.

The Availability Heuristic and Frequency Estimation

The availability heuristic is a cognitive mechanism where people judge the likelihood, probability, or frequency of an event occurring based on how easily specific examples or instances of that event come to mind. This heuristic relies on the mental accessibility of information; if certain information or occurrences can be retrieved from memory quickly and with minimal effort, the individual perceives them as being more common or likely to happen in reality. Factors such as the recency of an event, the vividness of a memory, or the emotional impact of a specific instance can make it more "available" in the mind, leading to potential biases where rare but highly publicized events are judged to be more frequent than common but less memorable ones.

Source Attribution

The conceptual definitions and educational material regarding these cognitive heuristics are presented by MR.SINN.