One week of solitary confinement of prison inmates produced significant changes in their EEG frequency and visual evoked potentials (VEP) that parallel those reported in laboratory studies of sensory deprivation. EEG frequency declined in a nonlinear manner over the period. VEP latency, which decreased with continued solitary confinement, was shorter for these 5s than for control 5s whose VEP latency did not change over the same period. Experimental 5s who had been in prison longer had shorter VEP latencies than relative newcomers to the prison.
10 maximum security prison inmates underwent perceptual deprivation for 7 days. There were 10 controls. After 7 days deprivation the deprived Ss sought a lower level of visual input and about the same level of auditory input as controls which was comparable to their own pre-test behaviour. These results were discussed in terms of recent theory and research results in stimulation seeking.
Rats under spreading depression (SD) were measured either on licking for sucrose, spontaneous activity in a wheel, or Sidman avoidance in a wheel with electrifiable grids; all performed in repeated cycles of bursts of activity followed by inactivity rather than showing total inactivity. Durations from one burst to the next ranged 6-10 min., identical to the interval reported for the repetitive transcortical spread of the steady potential accompanying SD. These data suggest that SD is not a functional ablation during the entire depression period.
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