Psychology ETDs

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Both an early and a late system of efference could be detected in anterior middle suprasylvian gyrus upon stimulation of ipsilateral visual cortex with single pulses in chloralosed cats. The early system was seen as a positive potential peaking within 10 msec after the stimulus, and it was eliminated or reduced by vertically sectioning between visual cortex and anterior middle suprasylvian gyrus. The late system (a positive potential peaking 15 to 30 msec after the stimulus) was eliminated by either an undercutting of visual cortex or aiscrcte lesions in the ipsilateral superior colliculus. The early system was maximally elicited from the 17/18 boundary and just rostral to this boundary whereas the late system was maximally elicited from the 17/18 boundary and just caudal to chis boundary. The response fields for the evoked potentials and the depth distributions of the cells of the early and late system coincided in anterior middle suprasylvian gyrus. The early system activated cells in AMSS (latency of 7 msec) which were nonspecifically potentiated by flash and forepaw conditioning and which showed delayed and visual specific blocking interactions. The late system activated cells in anterior middle suprasylvian gyrus at a mean latency of 22 msec in a fashion analogous to their activation by flash and forepaw stimulation. The late system showed reciprocal interactions with these inputs. The results were interpreted as providing a basis for the transmission of information from visual cortex to anterior middle suprasylvian gyrus.

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First Committee Member (Chair)

John M. Rhodes

Second Committee Member

Peder Johnson

Third Committee Member

Dennis Feeney

Fourth Committee Member

Alfred Bruner

Fifth Committee Member

Frank A. Logan



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Psychology Commons