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Habituation of the orienting response to auditory and visual stimuli in rats trained to press a bar

100%
Walasek G., Wesierska M., Zielinski K.
Acta Neurobiologiae Experimentalis
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1994
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vol. 54
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issue 2
133-141
2
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Conditioning of fear and conditioning of safety in rats

100%
Walasek G., Wesierska M., Zielinski K.
Acta Neurobiologiae Experimentalis
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1995
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vol. 55
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issue 2
121-132
EN
In separate groups of rat forward and backward procedures for classicla defensive conditioning were superimposed on on-going bar pressing for food.The forward conditioned stimulus elicited suppression of bar presses, indicating acquisition of fear.The backward stimulus paired with identical shock elicited behaviour typical for rats in a condition of safety and caused an increase of bar press rate.Enhancement of bar presses acquired in the cource of bacward conditioning was stable, immune to influences from unsignalled shocks presented in the same experimental context, and resistant to extinction when all shocks were discontinued.Properties of the employed variety of the backward conditioning procedure are discussed.QWhen a brief shock overshadowed the onset of a backward stimulus, the remaining portion of the stimulus became a signal of safety.
3
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Changes of the acoustic startle reflex in rats with radiation-induced hippocampal lesion

100%
Blaszczyk J. W., Walasek G., Woznicka A., Seress L.
Acta Neurobiologiae Experimentalis
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1999
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vol. 59
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issue 3
171-176
EN
The main question of the study was: to what extent does a neonatal radiation-induced hippocampal lesion lead to emotional changes in adulthood? Acoustic startle response (ASR) was studied in two groups of adult rats. The rats from the first group (14 animals) were exposed to neonatal x-ray irradiation. Their ASR were compared with those from the 10 intact rats that formed a control group. The ASR was tested during two sessions with different illumination of the acoustic chamber. During the first session the rats were tested in the darkness while during the second test the acoustic chamber was illuminated with a 15 W bulb. Irradiation resulted in a significant reduction of granule cells of the hippocampus (about 55%). The lesion resulted in emotional and behavioral changes evidenced by modification of the ASR. The irradiated rats exhibited a significantly increased amplitude of the startle response. In contrast to the light condition, the darkness context caused a decline of the ASR amplitude in the control group and failed to elicit significant changes in the lesioned animals. The results support the hypothesis that hippocampal lesions disrupt motor inhibition.
4
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Effects of social rearing conditions on conditioned suppression in rats

100%
Walasek G., Wesierska M., Werka T.
Acta Neurobiologiae Experimentalis
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2002
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vol. 62
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issue 1
25-31
EN
Twenty-two rats were reared in standard conditions during the first two months of their life. Then the animals were divided into two groups exposed to different rearing conditions. Twelve animals (Group SO) were housed socially, six animals per cage, and for three weeks they were subjected to sensory stimulation in an enriched environment. The other ten subjects were kept individually (Group IN); one rat per mesh cage, in conditions of relatively impoverished sensory stimulation. In both groups the training of the conditioned emotional response (CER) was performed when animals were three months old. In contrast to IN subjects, the rats subjected to permanent social contacts and reared in the enriched environment (Group SO) revealed almost equally low instrumental response rates in trials with the conditioned stimulus (CS) paired with nociceptive foot-shock (US), and in periods when no CS and/or US were applied. The results suggested that early exposure to an enriched environment caused a later decrease of the animals? capability to differentiate between the aversive CS and cues of the experimental context. This cognitive impairment was probably a secondary effect of fear generalized to the entire experimental situation.
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