The influence of target probability on visual awareness: based on signal detection theory

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 is no target stimulus. The experimental materials were made from online-gabor-patch-generator. The background brightness of all these types of stimuli was 22cd/m2. The experiment adopted 3 (target probability: high/medium/low) single-factor experimental design, in which the high target probability was 75% probability of stimulus occurrence, the medium target probability was 50% probability of stimulus occurrence, and the low target probability was 25% probability of stimulus occurrence. The participants were not told what proportion of the stimulus was present before the experiment began. Experimental stimuli are presented in E-Prime 2.0 software. The resolution of the screen is 1024x768 pixels, and the screen refresh rate is 60Hz (1 refresh cycle is about 17ms). The subject is about 80cm away from the screen. The masking model was used to detect the experimental task first, and then to judge the level of consciousness.