Willpower and conscious percept: volitional switching in binocular rivalry.

PloS One
Laila Hugrass, David Crewther

Abstract

When dissimilar images are presented to the left and right eyes, awareness switches spontaneously between the two images, such that one of the images is suppressed from awareness while the other is perceptually dominant. For over 170 years, it has been accepted that even though the periods of dominance are subject to attentional processes, we have no inherent control over perceptual switching. Here, we revisit this issue in response to evidence that top-down attention can target perceptually suppressed 'vision for action' representations in the dorsal stream. We investigated volitional control over rivalry between apparent motion (AM), drifting (DM) and stationary (ST) grating pairs. Observers demonstrated a remarkable ability to generate intentional switches in the AM and D conditions, but not in the ST condition. Corresponding switches in the pursuit direction of optokinetic nystagmus verified this finding objectively. We showed it is unlikely that intentional perceptual switches were triggered by saccadic eye movements, because their frequency was reduced substantially in the volitional condition and did not change around the time of perceptual switches. Hence, we propose that synergy between dorsal and ventral stream repres...Continue Reading

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Citations

May 30, 2014·PloS One·Enrico Di Pace, Chiara Saracini
Dec 30, 2014·Frontiers in Human Neuroscience·Lisa ScocchiaJochen Triesch
Nov 28, 2013·Twin Research and Human Genetics : the Official Journal of the International Society for Twin Studies·Phillip C F LawTrung T Ngo

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