Sex and Time-of-Day Impact on Anxiety and Passive Avoidance Memory Strategies in Mice

Frontiers in Behavioral Neuroscience
Ana Belén Meseguer HenarejosMiroljub Popović

Abstract

In humans, anxiety and cognitive processes are age, gender, and time of day dependent. The purpose of the present study was to assess whether the time of day and sex have an influence on anxiety and emotional memory in adult mice. Light-dark and passive avoidance (PA) tests were performed at the beginning and at the end of the light cycle, defined as Zeitgeber time (ZT) ZT0-2.5 and ZT9.5-12, respectively. A baseline difference in anxiety was not found, but on the 24 h retention trial of the PA test, females presented longer latencies to enter into the dark compartment at the ZT0-2.5 time point of the day. The data from the second test day (PA reversal trial) indicated that some animals associated the dark compartment with an aversive stimulus (shock), while others associated the aversive stimulus with crossing from one compartment to another. At the ZT9.5-12, female mice mainly related the aversive stimulus to transferring from one compartment to another, while male mice associated darkness with the aversive stimulus. There was a negative correlation between the frequency of light-dark transitions in the light-dark test and the PA latency on the 24 h retention trial in males tested at ZT0-2.5. The PA latency on the reversal and...Continue Reading

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Citations

Feb 11, 2021·International Journal of Molecular Sciences·Francesco TraccisMiriam Melis

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