Induced subject-relative movement

Persistence of apparent movement of a stationary point after removal of inducing stimulus

R. H. Day*, R. G. Dickinson, K. I. Forster

*Corresponding author for this work

Research output: Contribution to journalArticle

3 Citations (Scopus)


It was observed by chance that perceived movement of a stationary spot of light in a dark featureless field persists after its induced movement by a moving frame. When the frame was suddenly occluded, apparent movement of the spot persisted in the same direction as prior induced movement. The effect which is compelling and readily reported and referred to as induced subject-relative movement (ISRM) was confirmed and further investigated in four experiments. In the first, the informal observations of ISRM were confirmed using manual tracking to index perceived movement, and in the second, it was shown to occur only very slightly and briefly when the frame merely stopped. In the third experiment, ISRM was shown to occur following two different paths of induced movement, and in the fourth, not to occur following real movement of the spot, which was almost indistinguishable from its induced movement. It is suggested that the effect arises from the absence of a signal for cessation of perceived movement when the frame disappears.

Original languageEnglish
Pages (from-to)510-517
Number of pages8
JournalPerception and Psychophysics
Issue number6
Publication statusPublished - Nov 1976
Externally publishedYes

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