Human short-latency ocular vergence responses produced by interocular velocity differences.

摘要: We studied human short-latency vergence eye movements to a novel stimulus that produces interocular velocity differences without changing disparity signal. Sinusoidal luminance gratings moved in opposite directions (left vs. right; up down) the two eyes. The grating seen by each underwent ¼-wavelength shifts with image update. This arrangement eliminated cues, since phase difference between eyes alternated 0° and 180°. nevertheless observed robust responses (VRs), whose sign was consistent (IOVDs), indicating IOVD cue isolation can evoke VRs. effective only when images overlapped space. equally VRs for horizontal motions one eye, right other) vertical (up down other). Whereas former are naturally generated objects moving depth, latter not part of our normal experience. To knowledge, this is first demonstration behavioral consequence IOVD. may reflect fact some neurons area MT sensitive these motion signals (Czuba, Huk, Cormack, & Kohn, 2014). were strongest spatial frequencies range 0.35-1 c/°, much higher than optimal evoking ocular-following during frontoparallel motion. suggests detected different neuronal populations. also produced using uncorrelated one-dimensional white-noise stimuli. In case most stimuli have low speed, as predicted if drive originates tuned high (Sheliga, Quaia, FitzGibbon, Cumming, 2016).