Cryogenic probes were implanted in monkeys for cooling cortical “association areas” in unanesthetized state. Cooling was obtained by attaching special D.C. operated thermodes to the probes. When the parastriate and the lateral frontal cortex were cooled to 5° C, the amplitude of averaged visual evoked potentials recorded from the striate cortex was depressed. The change is conspicuous in long latency components of evoked response.
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