Cross-fixation transfer of motion aftereffects with expansion motion
Xin Meng, Pietro Mazzoni, and Ning Qian, Vision Research,
2006, 46:3681-3689.
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paper (PDF file).
Abstract
It has been shown that motion aftereffect (MAE) not only is present at
the adapted location but also partially transfers to nearby non-
adapted locations. However, it is not clear whether MAE transfers
across the fixation point. Since cells in area MSTd have receptive
fields that cover both sides of the fixation point and since
many MSTd cells, but not cells in earlier visual areas, prefer complex
motion patterns such as expansion, we tested cross-fixation
transfer of MAE induced by expanding random-dots stimuli. We also used
rightward translational motion for comparison. Subjects adapted to
motion patterns on a fixed side of the fixation point. Dynamic
MAE was then measured with a nulling procedure at both the adapted
site and the mirror site across the fixation point. Subjects'
eye fixation during stimulus presentation was monitored with an
infrared eye tracker. At the adapted site, both the expansion and the
translation patterns generated strong MAEs, as expected. However, only
the expansion pattern, but not translation pattern, generated
significant MAE at the mirror site. This remained true even after
we adjusted stimulus parameters to equate the strengths of the
expansion MAE and translation MAE at the adapted site. We conclude
that there is cross-fixation transfer of MAE for expansion motion
but not for translational motion.
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