Plasticity of Visual Memory circuits in Developing Monkeys: Evidence of Exuberant Pathways in Area Teo of Infant
Nigro, Elise Danielle
Visual object recognition relies on the connections between area TE and the amygdala. Bilateral removal of area TE in adult rhesus monkeys (Macaca mulatta) results in a severe loss of visual recognition, while infant monkeys receiving the same lesion show significant sparing of this function. This sparing could be the result of other cortical areas taking over the area TE connections with the amygdala; possibly through the maintenance of exuberant pathways that usually retract during development. Area TEO was chosen to examine the existence of such exuberant pathways. The neural tracing methods of wheat germ agglutin-conjugated horseradish peroxidase and autoradiography were employed to trace the connections between areas TE and TEO and the amygdala in both an infant and adult monkey. Reciprocal connections were observed between area TEO and the amygdala in the infant, but no such connections were found in the adult; thus, the existence of exuberant pathways in area TEO of the infant identifies it as one of the possible areas that are involved in taking over the connections between area TE and the amygdala.
v, 38 p.
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