Combined organizational and activational effects of short and long photoperiods on spatial and temporal memory in rats |
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Authors: | MacDonald Christopher J Cheng Ruey-Kuang Williams Christina L Meck Warren H |
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Affiliation: | Department of Psychology and Neuroscience, Genome Sciences Research Building II, 3rd Floor, 572 Research Drive, Box 91050, Duke University, Durham, NC 27708, USA. |
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Abstract: | The present study examined the effects of photoperiod on spatial and temporal memory in adult Sprague-Dawley rats that were conceived and reared in different day lengths, i.e., short day (SD-8:16 light/dark) and long day (LD-16:8 light/dark). Both male and female LD rats demonstrated increased spatial memory capacity as evidenced by a lower number of choices to criterion in a 12-arm radial maze task relative to the performance of SD rats. SD rats also demonstrated a distortion in the content of temporal memory as evidenced by a proportional rightward shift in the 20 and 60 s temporal criteria trained using the peak-interval procedure that is consistent with reduced cholinergic function. The conclusion is that both spatial and temporal memory are sensitive to photoperiod variation in laboratory rats in a manner similar to that previously observed for reproductive behaviour. |
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Keywords: | Circadian rhythms Interval timing Time perception Radial-arm maze Spatial navigation |
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