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J Haubenreiser

Publications and source records attributed to J Haubenreiser.

8 recordsLinked to original sources
PubMed1981

Hippocampal slow wave activity during appetitive and aversive conditioning in the cat.

The electrical activity of the dorsal and ventral divisions of the hippocampus was investigated quantitatively during the development of discriminative operant training and defensive conditioning. Signal-related (respondent, sign-tracking) and goal-directed (operant, 'voluntary') activities and their hippocampal electrical correlates were compared. Signal-related behaviour was accompanied by significantly higher frequency spectral peaks than lever press behaviour. Spectral peaks were higher during lever pressing in early stages of training as compared to criterion performance. In defensive conditioning overt sign-tracking behaviour disappeared but spectral peak shifts toward higher values upon signal presentation persisted. Comparison of dorsal and ventral hippocampal activity revealed high coherence values and similar frequency shifts during behaviour transitions. These findings argue against suggestions that a close relationship exists between elementary motor acts and hippocampal EEG.

Animals↗
PubMed1980

[Modification of light-evoked potentials depending on the feeding behavior of rabbits. I. Dependence on motivational state].

Flash evoked potentials (EP) from visual cortex, dorsal hippocampus, and other brain structures were recorded during various behavioral situations in freely moving rabbits. The aim of the study was to investigate the direction and rate of EP-changes after a two-day food deprivation. Potentials evoked during slow wave sleep had not shown any systematical changes after the food deprivation. Considerable changes, almost synchronously in different structures, were observed during an active food expectance in a pseudoconditioning experiment in contrast to the hungry sleep state. Prominent was a significant reduction in peak latency and amplitude of the primary components, a massive positivation (surface negativation) in the early section of the potentials (30-100 ms), a depression of the late negative complex in visual cortex and the appearance of early components in the sensomotory cortex. Our results show that outside the typically motivational centers a short food deprivation causes changes in evoked neuronal activity only during a certain motivational level. Considering similar EP-configurations in otherwise motivated wakefulness, the participation of nonspecific and also motivational specific mechanisms of activation is discussed.

Animals↗
PubMed1979

Auto-shaping or orienting?

Four experiments were carried out to study the development of the orienting response (OR) under different experimental conditions in the cat and rat. In Experiment I and II (cat) and Experiment IV (rat) classical CS-US pairing was used (with food, shock and water reinforcers, respectively). In Experiment III (cat) an instrumental pedal press response was brought under the control of a discriminative signal. In all four experiments the auditory CS was spatially discontiguous with reinforcement in order t o separate CS directed orienting responses from US related activities. Exposure to CS signalling food or water caused the animals to orient to it throughout conditioning (up to 700 trials) and this overt responding was absent if CS predicted aversive reinforcers. OR was consistently followed by goal (US) directed anticipatory activities. It is proposed that the CS directed auto-shaped response ("sign-tracking") is identical with the conditional orienting response, and that the spatio-temporal patterning of behaviors is influenced both by CS and US.

Animals↗