PSYC 4365 Lecture Notes - Lecture 21: Motion Detector, Receptive Field, Correspondence Problem
Document Summary
Motion is just a change in position over time. Motion detector circuit does not need real motion in order to fire. Figure 8. 4 apparent motion on the screen: aperture: an opening that allows only a partial view of an object. Correspondence problem (motion): the problem faced by the motion detection system of knowing which feature in frame 2 corresponds to which feature in frame 1. Aperture problem: the fact that when a moving object is viewed through an aperture (or a receptive field), the direction of motion of a local feature or part of an object may be ambiguous. There are several directions of motion within each aperture that are compatible with the stimulation the receptor is receiving. Whichever possible motion direction is the same in all apertures is the true global motion direction of the object. Figure 8. 7 building a global-motion detector: we can say something about where global-motion detectors are:
