INTEROCULAR TRANSFER OF EXPANSION, ROTATION, AND TRANSLATION MOTION AFTEREFFECTS

The motion aftereffect demonstrates the existence of direction-selecti ve mechanisms in the visual system. However, direction-selective cells exist within many visual areas, including V1 and MT/V5. Can motion af tereffects be generated within each of these areas? In visual cortical areas beyond V1 almost all cells are binocular, whereas a smaller per centage are binocular in V1. The degree of binocularity can be reveale d psychophysically by assessing interocular transfer. Interocular tran sfer of motion aftereffects generated from expanding, rotating, and tr anslating dynamic random-dot patterns were therefore compared, since t hese stimuli should activate cells in higher visual areas selectively. Partial interocular transfer was found that was greater for expansion and rotation than for translation. The results support the involvemen t of higher visual areas in motion aftereffects to complex animation s equences.