Asch and Witkin showed that when an observer adjusted a bar on the far wall of a miniature room tilted at 22° laterally, the apparent vertical of the bar was displaced about 10°–14° in the direction ...

In primates with a small foveal region of densely packed photoreceptors in their retinae that provide high acuity vision, each eye is moved about by six extraocular muscles, innervated by neurons in ...