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Evidence accumulation relates to perceptual consciousness and monitoring

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Pereira Michael, Megevand Pierre, Tan Mi Xue, Chang Wenwen, Wang Shuo, Rezai Ali, Seeck Margitta, Corniola Marco, Momjian Shahan, Bernasconi Fosco, Blanke Olaf, Faivre Nathan,
Project Using deep brain stimulation to dig out the subcortical correlates of consciousness
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Original article (peer-reviewed)

Journal Nature Communications
Volume (Issue) 12(1)
Page(s) 3261 - 3261
Title of proceedings Nature Communications
DOI 10.1038/s41467-021-23540-y

Open Access

Type of Open Access Publisher (Gold Open Access)


A fundamental scientific question concerns the neural basis of perceptual consciousness and perceptual monitoring resulting from the processing of sensory events. Although recent studies identified neurons reflecting stimulus visibility, their functional role remains unknown. Here, we show that perceptual consciousness and monitoring involve evidence accumulation. We recorded single-neuron activity in a participant with a microelectrode in the posterior parietal cortex, while they detected vibrotactile stimuli around detection threshold and provided confidence estimates. We find that detected stimuli elicited neuronal responses resembling evidence accumulation during decision-making, irrespective of motor confounds or task demands. We generalize these findings in healthy volunteers using electroencephalography. Behavioral and neural responses are reproduced with a computational model considering a stimulus as detected if accumulated evidence reaches a bound, and confidence as the distance between maximal evidence and that bound. We conclude that gradual changes in neuronal dynamics during evidence accumulation relates to perceptual consciousness and perceptual monitoring in humans.