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Individual differences in wild (WWCPS) rat — manifested in the exploration box

100%
Pisula W.
Polish Psychological Bulletin
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2010
|
vol. 41
|
issue 1
31-35
EN
Thirty nine WWCPS rats were tested in the exploration box throughout fifteen sessions. Factor analysis was run to extract the main dimensions describing rat behavior. Two factors were extracted, confirming the validity of the concept of two dimensional structure of individual differences in rats. Hierarchical cluster analysis run on factor scores showed that only three out of a possible four types of factor combinations are actually present within observed group of animals. In terms of individual differences structure, the study provide support for the view that laboratory rats are still rats.
2

VOCALIZATIONS IN THE FREQUENCY OF 22 KHZ AS AN INDICATOR OF THE LEVEL OF EMOTIONAL EXCITATION IN HIGH AND LOW REACTIVE RATS (Wokalizacje w czestotliwosci 22 kHz jako wskaznik poziomu pobudzenia emocjonalnego u szczurow wysoko i nisko reaktywnych)

100%
Zieba K., Gulatowska J., Trojan M.
Psychologia-Etologia-Genetyka
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2010
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vol. 22
27-41
EN
The aim of the research was to verify whether vocalizations at the frequency of 22 kHz can be an effective indicator of emotional arousal of rats in behavioral tests. The research was conducted with the use of 48 Sprague-Dawley strain rats. The rats were divided into two groups: of high or low reactivity, through preselection in the open field test. The rats were exposed to a stressor (a nip on the neck) and their vocalizations were recorded with the use of an ultrasound detector. Presented results suggest that vocalization of warning calls can be considered as an indicator of emotional reactivity in rats.
3

EFFECT OF STRESS ON GLUCOSE INTAKE IN RATS

88%
Ostaszewski P., Bialaszek W.
Psychologia-Etologia-Genetyka
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2006
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vol. 13
113-133
EN
The following experiment was conducted to investigate the effect of stressful white noise on glucose (20% solution) intake in sixteen male Brown-Norway rats. The experiment was divided into five stages, each consisting of five 20 min sessions held on separate days. Rats were exposed to two levels of white noise, one 95 dB (stress conditions) and 70 dB masking noise (non-stress conditions). Intensity of white noise was alternately applied across the stages beginning with 70 dB. In the stress conditions white noise significantly inhibited glucose intake.
4

Response to novelty in rats tested in isolation and in pairs: focus on exploration and play

75%
Tanas L., Stryjek R.
Polish Psychological Bulletin
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2008
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vol. 39
|
issue 2
81-88
EN
The main goal of the study was to compare investigatory responses towards novelty in 20 Wistar rats divided into two experimental groups (solitary exploration vs. exploration in pairs). Additionally, relationship between novelty and social play/interaction was analyzed in the dyad group. Procedure involved placing animals in an experimental chamber during fifteen, six minute trials on successive days of the study. On the eleventh session a new object was introduced. The results are summarized within several behavioral categories. Investigatory responses of rats in dyad to novel object in familiar environment were not quantitatively different, than those of isolated animals. The animals from both groups responded to the novel object by focusing their exploratory activity on the source of new stimulation. Amount of social play and social exploration was influenced by the experimental manipulation with important sex differences present.
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