RT Journal Article
A1 McKee, Suzanne
A1 Wade, Alex
A1 Pettet, Mark
A1 Vildavski, Vladimir
A1 Appelbaum, Greg
A1 Norcia, Tony
T1 Disparity processing in the human brain imaged with high density EEG
JF Journal of Vision
JO Journal of Vision
YR 2007
DO 10.1167/7.15.84
VO 7
IS 15
SP 84
OP 84
SN 1534-7362
AB  Psychophysical thresholds for relative disparity are far better when test and reference targets are presented in the same plane than when targets are presented in two planes separated by a pedestal disparity. Is this sensitivity difference reflected in the aggregate neural responses of different visual areas? We used high-density EEG recording, combined with fMRI-defined regions of interest, to localize the responses to disparity modulation in four visual areas: V1, V3A, V4 and hMT+. The stimulus consisted of randomly-spaced vertical lines. Alternating horizontal strips of the line pattern were either static or modulated repetitively by a 6 arcmin change in disparity. We compared the responses to disparity modulation in the same plane to modulation when the static and modulated strips were separated by a fixed 6 arcmin disparity pedestal. All four areas gave larger responses to modulation in the same plane than to modulation with the 6 arcmin pedestal. However, the biggest difference was observed in area hMT+, not V1. Extra-striate areas do not simply mirror response amplitudes in V1. Indeed, the form of the temporal responses in extra-striate areas was markedly different from the V1 response, suggesting that extra-striate areas may encode disparity-generated surface organization, as well as disparity magnitude. 
RD 3/2/2021
UL https://doi.org/10.1167/7.15.84