Abstract
Spatial cognition is one of the basic cognitive functions of animals and broadly spreads in animal kingdom. The dorsomedial part of caudal telencephalon of bird is homologue of mammalian hippocampus. Both allometric and lesion studies suggest spatial memory function of the avian hippocampus. Lesions in the dorsal telencephalon of fish cause deficits in spatial memory, however, hippocampus of fish has not yet been identified. In comparison with mammals, the avian hippocampal function seems to specialized to spatial one. Difference in hippocampal functions may suggest divergent functions of the homologous structure of brains. (Japanese Journal of Physiological Psychology and Psychophysiology;, 21 (1) : 31-38, 2003.)
