Where does aftereffect collide?

In materials science, the elastic (or anelastic) aftereffect is the time-dependent part of a solid's response to stress: after a load is applied the strain keeps creeping toward its full value, and after the load is removed the strain returns only gradually rather than snapping back at once. Nowick and Berry's 1972 Anelastic Relaxation in Crystalline Solids is the standard treatment of these delayed, recoverable deformations and the atomic relaxations behind them. The referent is a delayed, recoverable mechanical response of a material, measured by relaxation times, and it is a different construct from the perceptual aftereffect that shares the word.[1]

Unit

The delayed, recoverable strain following a change in load

Recovery means

Strain recovers over a characteristic relaxation time after the load is removed

Measured by

Measured by creep-and-recovery curves and by anelastic relaxation times

In visual perception, an aftereffect is a temporary distortion of perception that follows prolonged exposure to a stimulus: the best-known case is the motion aftereffect, or 'waterfall illusion', in which, after watching steady motion, a stationary scene appears to drift in the opposite direction. Anstis, Verstraten, and Mather's 1998 The motion aftereffect reviews how adaptation of direction-selective neurons produces this illusory motion. The referent is an adaptation-induced bias in what is perceived, measured by its strength and decay, a distinct construct from a material's delayed strain and joined to it only by the word.[2]

Unit

The strength and duration of the illusory percept after adaptation

Recovery means

The aftereffect decays over seconds to minutes as adaptation wears off

Measured by

Measured by the duration and nulling strength of the illusory percept after adaptation