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J Neurophysiol. 2014 Feb;111(3):533-43. doi: 10.1152/jn.00549.2013. Epub 2013 Nov 6.

Dynamics and cortical distribution of neural responses to 2D and 3D motion in human.

Author information

1
Centre de Recherche Cerveau et Cognition, Centre National de la Recherche Scientifique CERCO UMR 5549, Toulouse, France;

Abstract

The perception of motion-in-depth is important for avoiding collisions and for the control of vergence eye-movements and other motor actions. Previous psychophysical studies have suggested that sensitivity to motion-in-depth has a lower temporal processing limit than the perception of lateral motion. The present study used functional MRI-informed EEG source-imaging to study the spatiotemporal properties of the responses to lateral motion and motion-in-depth in human visual cortex. Lateral motion and motion-in-depth displays comprised stimuli whose only difference was interocular phase: monocular oscillatory motion was either in-phase in the two eyes (lateral motion) or in antiphase (motion-in-depth). Spectral analysis was used to break the steady-state visually evoked potentials responses down into even and odd harmonic components within five functionally defined regions of interest: V1, V4, lateral occipital complex, V3A, and hMT+. We also characterized the responses within two anatomically defined regions: the inferior and superior parietal cortex. Even harmonic components dominated the evoked responses and were a factor of approximately two larger for lateral motion than motion-in-depth. These responses were slower for motion-in-depth and were largely independent of absolute disparity. In each of our regions of interest, responses at odd-harmonics were relatively small, but were larger for motion-in-depth than lateral motion, especially in parietal cortex, and depended on absolute disparity. Taken together, our results suggest a plausible neural basis for reduced psychophysical sensitivity to rapid motion-in-depth.

KEYWORDS:

3D; high-density EEG; stereomotion; vision

PMID:
24198326
PMCID:
PMC3921412
DOI:
10.1152/jn.00549.2013
[Indexed for MEDLINE]
Free PMC Article

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