10.5061/DRYAD.4Q730
Yehezkel, Oren
University of California, Berkeley
Ding, Jian
University of California, Berkeley
Sterkin, Anna
Sheba Medical Center
Polat, Uri
Bar-Ilan University
Levi, Dennis M.
University of California, Berkeley
Data from: Binocular combination of stimulus orientation
Dryad
dataset
2016
orientation
contrast
binocular combination
2016-10-19T14:01:07Z
2016-10-19T14:01:07Z
en
https://doi.org/10.1098/rsos.160534
38641 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
When two sine waves that differ slightly in orientation are presented to
the two eyes separately, a single cyclopean sine wave is perceived.
However, it is unclear how the brain calculates its orientation. Here, we
used a signal detection rating method to estimate the perceived
orientation when the two eyes were presented with Gabor patches that
differed in both orientation and contrast. We found a nearly linear
combination of orientation when both targets had the same contrast.
However, the binocular percept shifted away from the linear prediction
towards the orientation with the higher contrast, depending on both the
base contrast and the contrast ratio. We found that stimuli that differ
slightly in orientation are combined into a single percept, similarly for
monocular and binocular presentation, with a bias that depends on the
interocular contrast ratio. Our results are well fitted by gain-control
models, and are consistent with a previous study that favoured the DSKL
model that successfully predicts binocular phase and contrast combination
and binocular contrast discrimination. In this model, the departures from
linearity may be explained on the basis of mutual suppression and mutual
enhancement, both of which are stronger under dichoptic than monocular
conditions.
Perceived Orientation dataRaw perceived orientation data for each of 4
observers at different base contrasts and contrast ratios.