Studying the Effects of Natural Visual Scene Changes on Typical Adult Visual Perception

A psychophysical task will be used to measure participants' ability to discriminate the horizontal position of the central object that is presented within the context of background objects in a natural visual scene. The task will be a two-interval forced choice task that presents one stimulus per interval. Between the two stimulus intervals, two masks will be shown in succession at the center of the monitor. The task of the participant will be to determine whether, compared to the central object presented in the first interval, the central object presented in the second interval is to the left or to the right. One of two feedback tones will be presented after the response is entered, indicating whether the participant was correct or incorrect. For trials in which there is no difference in the position of the central object between the two intervals, the response that will receive the correct feedback tone will be randomly selected per trial.