There are many examples of one visual stimulus affecting the perception of another. Such effects occur in various domains, including orientation and motion, and frequently occur both when the two stimuli are presented simultaneously (an illusion) or successively (an aftereffect). It is also frequently found that the illusion and aftereffect are affected by a particular independent variable in the same way, which often has led to speculation that they have common mechanisms. Here we demonstrate that the motion direction illusion (DI) and aftereffect (DAE) have different mechanisms. Two experiments show that when the two interacting stimuli are presented to different eyes, the DI does not occur but the DAE is obtained at full strength. These results suggest strongly that the DI is monocular and probably arises in visual cortical area V1; whereas the DAE is binocular and probably arises in extrastriate cortex.
|Number of pages||1|
|Journal||Australian Journal of Psychology|
|Issue number||Suppl. 1|
|Publication status||Published - 2006|
|Event||33rd Australasian Experimental Psychology Conference - University of Queensland, Brisbane, Australia|
Duration: 20 Apr 2006 → 23 Apr 2006