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要旨:
In natural settings, our eyes tend to track interesting or dangerous objects moving
towards us. This complicates the relationship between an object's motion and the
binocular retinal projection of its motion. To perceive the object's motion, the brain
should take eye movement information into account. This could be done using retinal
cues (the slip of static scene structures) or extra-retinal cues (e.g. copies of motor
commands). Previous studies have found that extra-retinal cues provide a very poor
cue to eye rotation (Erkelens Collewijn, Vision Research, 1985, 583-588; Regan et
al., Invest Opthal Vis Sci, 1986, 584-597) thus suggesting that extra-retinal cues are
not used to perceive motion-in-depth. Here, we re-evaluate the brain's use of extraretinal
cues in 3D motion perception. We employ conditions designed to isolate retinal
cues and extra-retinal cues to motion-in-depth. In contrast to previous reports, we nd
that observers can use extra-retinal cues to make accurate motiondiscriminations. We
report that extra-retinal signals provide reliable information about eye rotations that
is used to perceive 3D motion.
