Behavioural oscillations in visual orientation discrimination reveal distinct modulation rates for both sensitivity and response bias.

ABSTRACT: Perception is modulated by ongoing brain oscillations. Psychophysical studies show a voluntary action can synchronize oscillations, producing rhythmical fluctuations of visual contrast sensitivity. We used signal detection to examine whether voluntary action could also synchronize oscillations in decision criterion, and whether that was due to the oscillations of perceptual bias or of motor bias. Trials started with a voluntary button-press. After variable time lags, a grating at threshold contrast was presented briefly and participants discriminated its orientation (45° or -45°) with a mouse-click. Two groups of participants completed the experiment with opposite mappings between grating orientations and response buttons. We calculated sensitivity and criterion in the 800 ms period follow

SUBMITTER: Zhang H 

PROVIDER: S-EPMC6362039 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature