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Reward and Aversive Stimuli Produce Similar Nonphotic Phase Shifts

Authors :
Ilia Karatsoreos
Suzanne Hood
John S. Yeomans
Povilas Leknickas
Sean W. Cain
Martin Roland Ralph
Michael Verwey
Source :
Behavioral Neuroscience. 118:131-137
Publication Year :
2004
Publisher :
American Psychological Association (APA), 2004.

Abstract

Circadian rhythms in rodents respond to arousing, nonphotic stimuli that contribute to daily patterns of entrainment. To examine whether the motivational significance of a stimulus is important for eliciting nonphotic circadian phase shirts in Syrian hamsters (Mesocricetus auratus), the authors compared responses to a highly rewarding stimulus (lateral hypothalamic brain stimulation reward [BSR]) and a highly aversive stimulus (footshock). Animals were housed on a 14:10-hr light-dark cycle until test day, when they were given a 1-hr BSR session (trained animals) or a 1-mA electric footshock at 1 of 8 circadian times, and were maintained in constant dark thereafter. Both BSR pulses and footshock produced nonphotic phase response curves. These results support the hypothesis that arousal resulting from the motivational significance of a stimulus is a major factor in nonphotic phase shifts.

Details

ISSN :
19390084 and 07357044
Volume :
118
Database :
OpenAIRE
Journal :
Behavioral Neuroscience
Accession number :
edsair.doi.dedup.....670f5e358f577a3794cc1fe9d0444ee7
Full Text :
https://doi.org/10.1037/0735-7044.118.1.131