Cite as:
Grunewald A, Mingolla E, 1998, "Interocular transfer does not imply binocular sum of motion aftereffect" Perception 27 ECVP Abstract Supplement

Interocular transfer does not imply binocular sum of motion aftereffect

A Grunewald, E Mingolla

A model of the motion aftereffect (MAE) has been proposed that explains how transparent motion causes a nontransparent MAE [Grunewald and Lankheet, 1996 Nature (London) 384 358 - 360]. To extend that model to include binocular interactions, we studied the effect of interocular transfer on the direction of the MAE. Subjects were adapted with a rivalrous stimulus. The left-eye stimulus contained dots going up and to the right, the right-eye stimulus contained dots going up and to the left. During testing, a balanced random dot motion stimulus was presented either to both eyes, or to only one eye (left or right). Subjects indicated the direction in which they saw motion during the test phase.

With binocular test stimuli, observers see motion in the direction opposite to the vector sum of the adaptation directions. With monocular test stimuli, observers see MAE directions opposite to the corresponding monocular adaptation directions. In a second experiment, subjects were adapted with monocular stimuli, and tested with stimuli in the same eye, or in the opposite eye with respect to the adaptation stimulus. As expected, subjects indicated for each adaptation condition the same direction of the MAE irrespective of the eye of testing, that is interocular transfer was taking place.

Together, these results suggest that binocular sum of adaptation directions (as measured in the first experiment) is distinct from interocular transfer of adaptation effects (as measured in the second experiment), and that they do not necessarily co-occur.

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