Prestimulus power and phase of α and β predict discrimination accuracy and visual awareness

The experimental material was a low-contrast sinusoidal Gabor patch at the threshold level, tilted 45° vertically to the left or right. Michelson contrast ratios are 0.01, 0.02, and 0.03, respectively (Michelson contrast is calculated by the brightest brightness minus the darkest brightness divided by the sum of the two), and the presentation time and contrast are determined in the measurement threshold stage. The experimental materials were made from online-gabor-patch-generator. The background brightness of all these types of stimuli was 22cd/m2. The experiment was divided into two phases. The first stage was to determine the threshold and familiarizing participant with the experimental procedure. In the second stage, participants performed discrimination tasks while recording EEG. EEG data were collected using the Curry7 software produced by NeuroScan, and EEG recording was performed by participants wearing an extended international 10-20 system 64 electrode cap. When recording online, the center electrode of the forehead was grounded (located at the midpoint of the FCZ and FX connections), and the overhead electrode was a reference electrode. The sampling rate was 1000Hz in DC mode. Electrodes were placed outside both eyes to record horizontal eye electricity (HEOG) and above and below the left eye to record vertical eye electricity (VEOG). The resistance was kept below 10kΩ.