Evolutionary Perspectives on Personality

All 7 Terms & Definitions

Evolutionary puzzle of personality variation

If personality traits are heritable and affect fitness, directional selection should eliminate variation over time. The persistence of wide personality variation requires explanation through balancing selection, frequency-dependent selection, environmental heterogeneity, or mutation-selection balance.

Frequency-dependent selection

A mechanism maintaining variation in which the fitness of a strategy depends on its frequency in the population. Rare strategies can have fitness advantages over common ones, maintaining a stable mix (evolutionarily stable strategy). Proposed to explain the persistence of personality variation (e.g., bold vs shy, cooperative vs exploitative strategies).

Life history theory

An evolutionary framework examining how organisms allocate limited resources between growth, maintenance, and reproduction. The fast-slow continuum: fast strategies (early reproduction, many offspring, low investment) vs slow strategies (delayed reproduction, few offspring, high investment). Linked to personality variation in Conscientiousness, impulsivity, and risk-taking.

Nettle's cost-benefit analysis

Daniel Nettle's (2006) framework proposing that each Big Five dimension involves evolutionary tradeoffs — high extraversion brings mating success at the cost of injury risk; high Neuroticism brings threat vigilance at the cost of chronic stress. No single value is universally optimal, maintaining variation.

HEXACO model

A six-factor personality model developed by Ashton and Lee through cross-language lexical research. Adds Honesty-Humility (H) to the Big Five's five factors. The H factor captures sincerity, fairness, greed avoidance, and modesty — proposed to reflect evolutionarily important variation in cooperative vs exploitative social strategies.

Honesty-Humility (H factor)

The sixth factor in the HEXACO model. High scorers are sincere, fair, modest, and avoid exploitation; low scorers are manipulative, self-entitled, and deceitful (overlapping with dark triad traits). Proposed to reflect fundamental variation in altruistic vs exploitative social behaviour with evolutionary roots.

Dark triad

Three aversive personality traits: narcissism (grandiosity, entitlement), Machiavellianism (manipulation, exploitation), and psychopathy (callousness, impulsivity). Each has been examined through an evolutionary lens as representing an alternative reproductive strategy — particularly in short-term mating contexts.