Selectivity of the evoked potential for vernier offset |
| |
Authors: | S B Steinman D M Levi S A Klein R E Manny |
| |
Institution: | University of Houston, University Park, College of Optometry, 4901 Calhoun Boulevard, Houston, TX 77004,U.S.A. |
| |
Abstract: | Hyperacuity thresholds of a few arc seconds can be achieved psychophysically for a variety of spatial localization tasks. The present experiments show that evoked potentials can be elicited in response to the introduction of vernier offsets, but not by the introduction of other cues to hyperacuity such as bisection or relative pattern motion, although each of these cues is equally salient psychophysically. Moreover, vernier acuity measurements and the evoked potentials elicited in response to vernier offsets are strongly degraded by the introduction of flanking stimuli 2-4 min from the vernier target. This suggests that the hyperacuity VEP is a cortical correlate of a very specific type of hyperacuity, that produced by vernier offsets (colinearity failure). |
| |
Keywords: | Evoked potential Psychophysics Hyperacuity Vernier acuity Bisection Motion Spatial interference |
本文献已被 ScienceDirect 等数据库收录! |
|