As such, variability in monocular MID cue sensitivity across the visual field has not been systematically characterized. Whereas binocular MID cues are often studied using stimuli that simulate motion through relatively confined regions of three-dimensional (3D) space, monocular MID cues have mostly been studied in the context of self-motion, using stimuli that cover large portions of the visual field (Duffy & Wurtz, 1991a Rutschmann, Schrauf, & Greenlee, 2000 Warren, 2004). Monocular cues to MID are provided by optic flow, as well as changes in the retinal size and density of visual elements (Longuet-Higgins & Prazdny, 1980 Regan & Beverley, 1979). These results reveal distinct factors constraining the contributions of binocular and monocular cues to three-dimensional motion perception. Finally, contralateral monocular cue sensitivity was found to be a strong predictor of combined cue sensitivity. Third, we found that monocular cue sensitivity generally exceeded, and was independent of, binocular cue sensitivity. This resulted in better monocular discrimination performance when the contralateral rather than ipsilateral eye was stimulated. A major component of this variability was geometric: An MID stimulus produces the largest motion signals in the eye contralateral to its visual field location. Second, we determined that monocular MID cue sensitivity also varied considerably across the visual field. The stimuli were matched for eccentricity and speed, suggesting that this variability has a neural basis. We first confirmed prior reports of substantial variability in binocular MID cue sensitivity across the visual field. Here we measured sensitivity to binocular, monocular, and combined cue MID stimuli using a motion coherence paradigm. Because previous studies largely characterized sensitivity to these cues individually, their relative contributions to MID perception remain unclear. Such motion can be estimated based on both binocular and monocular cues. Intercepting and avoiding moving objects requires accurate motion-in-depth (MID) perception.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |