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Gaze modulation of visual aftereffects Shinya Nishida a,*, Isamu Motoyoshi a,1

Summary: Gaze modulation of visual aftereffects
Shin’ya Nishida a,*, Isamu Motoyoshi a,1
, Richard A. Andersen b
, Shinsuke Shimojo a,b
Human and Information Science Laboratory, NTT Communication Science Laboratories, NTT Corporation,
3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
Division of Biology, California Institute of Technology, Pasadena, CA 91125, USA
Received 25 June 2002; received in revised form 12 December 2002
Physiological studies of non-human primates have suggested that the direction of gaze can modulate the gain of neuronal res-
ponses to visual stimuli in many cortical areas including V1. The neural gaze modulation is suggested to subserve the conversion
from gaze-independent (eye-centered) to dependent (e.g., head-centered) representations. However, it has not been established
whether the gaze modulation has significant influences on human visual perception. Here we show that gaze direction modestly but
significantly modulates the magnitudes of the motion aftereffect, the tilt aftereffect and the size aftereffect. These aftereffects were
stronger when the adaptation and test patterns were presented in the same gaze direction, than when they were presented in different
gaze directions, even though the patterns always stimulated the same retinal location. The gaze modulation effect was not statis-
tically significant for the post-adaptation elevation of contrast detection thresholds. The gaze modulation of visual aftereffects
provides a useful psychophysical tool to analyze human cortical processes for coordinate transformations of visual space.


Source: Andersen, Richard - Division of Biology, California Institute of Technology


Collections: Biology and Medicine