The term area 8A of Walker refers to one of two components of area 8 of Walker, a portion of the frontal lobe of the macaque defined on the basis of cytoarchitecture and function. Area 8A differs from area 8B of Walker in that 8A has "fairly large pyramidal cells in the fifth layer." Both components have a "faint but definite granular layer." Electrical stimulation of either area elicits eye movements ( Walker-1940 ).