Some Normative Data for the Spiral Aftereffect

Abstract

67 college students were exposed to the spiral aftereffect (SAE) in varied combinations of stimulation time and direction of rotation to observe the frequency and duration of SAE for a normal population. It was noted: (a) Men report slightly more AEs than women. (b) More men than women always report an AE. (c) AE reports increase with longer inspection times. (d) Expansion AEs occur more often and last longer than contraction AEs. (e) Reversal stimulation yields fewer AE reports of shorter duration and has a greater effect on contraction AE than expansion AE, and (f) the relation between stimulation time and AE duration is not linear.