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Abstract:
We investigated the relationship between
compensation for the effects of smooth pursuit eye movements in localization and motion perception. Participants
had to indicate the perceived motion direction,
the starting point and the end point of a vertically
moving stimulus dot presented during horizontal
smooth pursuit. The presentation duration of the stimulus
was varied. From the indicated starting and end
points, the motion direction was predicted and compared
with the actual indicated directions. Both the
directions predicted from localization and the indicated
directions deviated from the physical directions, but the
errors in the predicted directions were larger than those
in the indicated directions. The results of a control
experiment, in which the same tasks were performed
during fixation, suggest that this difference reflects different
transformations from a retinocentric to a headcentric
frame of reference. This difference appears to be
mainly due to an asymmetry in the effect of retinal image
motion direction on localization during smooth pursuit.
