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3 Acta Neurobiologiae Experimentalis

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Escape from shock versus escape from shock accompanied by a visual stimulus in rats

100%

Zielinski K. , Savonenko A. V.

tom 60

nr 4

Two groups of 15 rats each were trained in a shuttle box to escape foot-shock either unsignalled or presented in compound with a visual cue: darkness. The visual cue presented in shock compartment amplifies the behavioral tendency actually prevailing in the response repertory of the rat. During the 1st session the compound enhanced the species-specific flight resulting in shortening of the rat's escape latency. Thereafter, during subsequent sessions, darkness exaggerated resistance to enter the other compartment; thus escape latencies were longer under compounded than under unsignalled procedure. The darkness cue reduces the intertrial response rate relative to the unsignalled group. This latter finding supports the discrimination model of the effect, since the compound helps the animals to discriminate the illuminated "safe" period between trials from the aversive shock period. Our data seem to suggest that the darkness presented synchronously with escapable grid-shock acquires aversive properties.

Interneuronal cortical connections and intertrial responses in appetitive instrumental learning

100%

Merzhanova G. K.

1997

tom 57

nr 3

Involvement of the lateral and dorsolateral amygdala in conditioned stimulus modality dependent two-way avoidance performance in rats

80%

Werka T.

1998

tom 58

nr 2