TY  - JOUR
PY  - 2014//
TI  - Dynamics and cortical distribution of neural responses to 2D and 3D motion in human
JO  - Journal of Neurophysiology
A1  - Norcia, Anthony M.
A1  - McKee, Susanne P.
A1  - Cottereau, Benoit R.
SP  - 533
EP  - 543
VL  - 111
IS  - 3
N2  - 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 fMRI-informed EEG source-imaging to study the spatio-temporal 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 inter-ocular phase - monocular oscillatory motion was either in-phase in the two eyes (lateral motion) or in anti-phase (motion-in-depth). Spectral analysis was used to break the steady-state visually evoked potentials (SSVEP) responses down into even and odd harmonic components within five functionally defined regions of interest (ROIs): V1, V4, lateral occipital complex (LOC), 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 ROIs, 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.<p />  <p>Language: en</p>
LA  - en
SN  - 0022-3077
UR  - http://dx.doi.org/10.1152/jn.00549.2013
ID  - ref1
ER  -