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Biomedical subjects

R H Bauer

Publications and source records attributed to R H Bauer.

30 records · Page 2Linked to original sources
PubMed1976

Feedback training of 36 - 44 HZ EEG activity in the visual cortex and hippocampus of cats: evidence for sensory and motor involvement.

Milk reinforcement was contingent on the occurrence of 36 -44 (40) Hz EEG activity in the left visual cortex (VC) of one group of cats and in the right hippocampus (H) of a second group. Both groups learned to increase 40 Hz activity, and acquisition of reinforcement was associated with immobility. A third group (behavioral controls - BC) was trained by the method of successive approximation to behave in a similar manner to VC and H cats. Training significantly increased 40 Hz activity in all of the following structures, except the hippocampi of VC cats and between the right and left visual cortex of H and BC cats: posterior primary visual cortex (bilateral), anterior primary visual cortex (left), primary motor cortex (bilateral), dorsal hippocampus (bilateral), and midbrain reticular formation (bilateral). Since the behavioral and EEG changes of H and BC animals were similar, immobility appears to be important for increased hippocampal 40 Hz activity produced by feedback training. Testing in darkness enhanced 40 Hz activity in the trained area of VC cats but had no effect on H or BC animals. These results, in conjunction with the observation that VC cats appeared to visually fixate, suggest that VC cats may have learned to increase 40 Hz activity in the visual cortex by altering visual processing.

Animals↗
PubMed1976

Delayed-matching and delayed-response deficit from cooling dorsolateral prefrontal cortex in monkeys.

The hypothesis that the functional integrity of the dorsolateral prefrontal cortex is important for short-term memory of both spatial and nonspatial information was examined. Monkeys were tested in delayed matching-to-sample (DMS) and delayed-response (DR) tasks with delays of 0-32 sec. Testing was carried out under three different conditions: frontal cooling (FC), parietal cooling (PC), and normal temperature (noncooling, NC). Errors, reaction time, and motor activity were recorded. The proportion of correct responses decreased in NC as a function of the delay. This decrease was significantly accentuated by FC, whereas it was not modified by PC. At each delay, the decrement elicited by FC was as large in DR as in DMS. Reaction time and activity normally increased as a function of delay; these changes were enhanced by FC. The FC-induced decrements in proportion of correct responses suggest a faster loss from short-term memory of both spatial and nonspatial information.

Animals↗