Human recognition behavior is influenced by the phenomenon of shape constancy, which occurs when the shape of an object is correctly perceived regardless of the orientation of the object in space. The research reported here tests the validity of the shape-slant invariance hypothesis, a theoretical formulation of the phenomenon of shape constancy.…

Two experiments examined the effects of reductions in cortical cholinergic function on performance of a novel task that allowed for the simultaneous assessment of attention to a visual stimulus and memory for that stimulus over a variable delay within the same test session. In the first experiment, infusions of the muscarinic receptor antagonist…

Literature dealing with the disadvantaged is cursorily reviewed and questions raised by the literature are considered. Specifically, this study concerns the relationship between social class and the rate of processing of visual information in young children. Although various sources of slowness in learning are mentioned, this study focused only on…