Prestimulus power and phase of α and β influence sensitivity and criterion

The experimental material was sinusoidal Gabor patch with a Michelson contrast ratio of 0.03 and a vertical tilt of 45° to the left or right. Blank stimulus was no target. The experimental materials were made from online-gabor-patch-generator. The background brightness of all these types of stimuli was 22cd/m2. The experiments were conducted in a quiet, dimly lit EEG laboratory. Experimental stimuli are presented in E-Prime 2.0 software. The resolution of the screen was 1024x768 pixels, and the screen refresh rate was 60Hz (1 refresh cycle was about 17ms). The participant was about 80cm away from the screen. 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.