Cite as:
Likova L, Tyler C W, 2002, "Nulling of stereomotion induction and reverse stereomotion suppression" Perception 31 ECVP Abstract Supplement

Nulling of stereomotion induction and reverse stereomotion suppression

L Likova, C W Tyler

We have established stereomotion induction, ie motion induction in the stereodomain (Likova and Tyler, 2001 Perception Supplement, 78). Here we further explore the stereomotion induction process by (i) a cancellation technique, and (ii) extending the cancellation motion into the zone beyond the nulling point. The stimuli were dynamic autostereograms consisting of a target and a surround; both were horizontal lines of discs. The stereomoving surround induced depth motion into the stationary, unchanged in disparity, target. Adding actual stereomotion to the target cancelled the induced motion experience when it was in the opposite direction. Increasing the cancellation motion to the nulling point surprisingly decreased not only the induced target motion, but also the stereomotion in the surround. Beyond the nulling point, perceived motion in the target increased, while the surround-stereomotion perception was almost suppressed in a wide range of disparity changes. We named this novel phenomenon of suppression of the stereomoving surround by stereomoving target 'reversed stereomotion suppression', in contrast to the process of attributing stereomotion from the surround into the stationary target during 'straight' induction. A model of the target/surround interactions has been developed and is discussed in the context of dynamic organisation principles, operating in stereomotion perception and misperception.

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