Habituation

Definition

A non-associative learning process in which an organism's behavioral or physiological response to a repeated, biologically inconsequential stimulus progressively diminishes without sensory adaptation or motor fatigue. Unlike sensory adaptation (receptor-level change) or habit formation (stimulus-response strengthening), habituation reflects a central nervous system adjustment in stimulus processing and response threshold.

Etymology

Example

A jumping spider initially flees from a small vibrating tuning fork placed near its web, but after 10–15 harmless repetitions it ceases to respond, having learned the vibration predicts no threat; this habituation allows the spider to remain on its hunting platform despite ambient leaf tremors.

Synonyms

• response decrement
• stimulus-specific habituation

Related Terms

• sensitization
• sensory adaptation
• latent inhibition
• dishabituation
• startle response

Usage Notes

Distinguish carefully from sensory adaptation (peripheral receptor fatigue) and from motor fatigue (muscle exhaustion). In arthropod studies, habituation is often tested using standardized repeated stimuli—such as air puffs, light flashes, or substrate vibrations—to measure learning rate and memory duration. The phenomenon is reversible: presentation of a novel stimulus can restore the original response (dishabituation). Habituation is distinguished from associative learning because no contingent relationship exists between the habituated stimulus and any reward or punishment.