ABSTRACT
I am going to tell you about the influence of the extraretinal signal on reports of visual direction. There are, however, three other items that must concern us: (1) It is possible for the presence of other visual stimuli (visual context) to influence the report of visual direction for any particular stimulus being judged. (2) Visual stimuli presented as flashes for any particular duration persist in perception for a considerable time beyond the actual duration of the visual stimulus. (3) Eye movements result in smears and masking. I will be showing you that visual context, visual persistence, and smears and masking all control the perception of visual direction. But in order to study the extraretinal signal a situation must be employed that allows its influence to be separated from influences from these other sources.
