![]() ![]() From existing studies, it is impossible to know whether differences in brain anatomy are predetermined or whether the brain is susceptible to plastic change in response to environmental stimulation. In the healthy human, structural brain differences between distinct groups of subjects (for example, males and females, ref. ![]() In some species, hippocampal volumes enlarge specifically during seasons when demand for spatial ability is greatest ( 2, 3). Increased hippocampal volume relative to brain and body size has been reported in small mammals and birds who engage in behavior requiring spatial memory, such as food storing ( 2). One important role of the hippocampus is to facilitate spatial memory in the form of navigation ( 1). ![]()
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