Functional Specialization in the Lower and Upper Visual Fields in Humans: Its Ecological Origins and Neurophysiological Implications
Rept. for Sep 1984-Sep 1990
SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TX
Pagination or Media Count:
Functional specialization in the lower and upper visual fields in humans is analyzed in relation to the origins of the primate visual system. Processing differences between the vertical hemifields are related to the distinction between near peripersonal and far extrapersonal space, which are biased toward the lower and upper visual fields, respectively. Nonlinearglobal processing is required in the lower visual field in order to perceive the optically degraded and diplopic images in near vision, whereas objects in far vision are searched for and recognized primarily using linearlocal perceptual mechanisms.
- Anatomy and Physiology