Human fixation and voluntary pursuit: the interaction between central and peripheral motion stimuli.

Vision is, for a human being, one of the most important senses. The basic function of vision, which is relevant for all species which have a form of vision, is spatial orientatione This function is important for postural control in tasks such as standing upright, walking around, guiding a hand to touch an object, etc. The important beneficial effect of vision above other senses is that it allows the subject to acquire information about objects not Located in the close vicinity of the subject. A second function of vision, which is only found in the higher primates and which requires a high visual acuity, is the intake of symbolic information in tasks such as reading or Looking at a photograph. Vision allows a human brain to collect, select and process an enormous amount of information in a relatively short period of timea