ABSTRACT
Laboratory of Sensorimot or Research . National Eye Institute , National Institutes of Health , Bethesda , MD 20892. U.S.A.
Abstract-The definition of visual areas remains a key problem in the effort to elucidate cortical functions. Visual areas vary along a number of dimensions and are increasingly difficult to define according to traditional criteria at higher levels of the hierarchy. Three recentl y discovered areas in monkey parietal association cortex illustrate a new approach to this problem. Their definition depends on assessment of neuronal response properties in the aiert , behaving animal combined with precise reconstruction of recording sites. This approach permits recognition of functionally di stinct areas in the absence of retinotopic maps.
