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• W2054095513 abstract "Transient global ischaemia induces cell death in the CA1 layer of the hippocampus. To evaluate the functional consequences, we performed context-dependent fear conditioning. Ischaemia was induced by 2-vessel-occlusion (2VO) in gerbils. On day 6 post ischaemia or sham procedures (in control group) gerbils were placed in a test chamber and after 3 min adaption time exposed to foot-shocks (training session). On the next day the animals were placed in the same test chamber without foot-shocks (test session). As a parameter for memory performance we used the standard method of measuring the total freezing time via a cumulative time-sampling procedure during the test session. We found a significant longer total freezing time in control animals than in ischaemic animals. In addition, however, we applied a more detailed analysis of (i) quantifying the number of freezing bouts, (ii) the average duration of single freezing bouts, (iii) the activity pattern during the training and test situation and (iv) we differentially evaluated all the single time segments of the experiment. These analyses revealed that although maintenance of freezing (duration of freezing bout) was significantly lower in ischaemic animals compared to controls, the initiation of freezing (number of freezing bouts) was not significantly different between the two groups during the test session. The activity scores of ischaemic and non-ischaemic gerbils were similar during the adaption time of the training session. The foot-shock, however, induced a significantly different pattern of behaviour in the ischaemic animals, which was selectively reproduced during the test session. In conclusion, ischaemic gerbils reacted to a fearsome thread with a behavioural pattern different from unlesioned animals and they revealed this specific foot-shock induced behaviour again during the test session. This indicated that CA1 hippocampal death did not interrupt memory performance but changed expression of fear. Therefore, measuring duration of freezing and the activity score seems to be not applicable for quantitative comparisons of memory deficits after 2VO in gerbils in a context-dependent fear conditioning task. Our results indicate, however, that initiation of freezing (number of freezing bouts) may be a more suitable parameter comparing gerbils with and without CA1 damage." @default.
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• W2054095513 date "2011-07-01" @default.
• W2054095513 modified "2023-09-26" @default.
• W2054095513 title "Effects of transient global ischaemia on freezing behaviour and activity in a context-dependent fear conditioning task – Implications for memory investigations" @default.
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• W2054095513 doi "https://doi.org/10.1016/j.brainresbull.2011.04.001" @default.
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