MacDonald Christopher J, Cheng Ruey-Kuang, Williams Christina L, Meck Warren H
Department of Psychology and Neuroscience, Genome Sciences Research Building II, 3rd Floor, 572 Research Drive, Box 91050, Duke University, Durham, NC 27708, USA.
Behav Processes. 2007 Feb 22;74(2):226-33. doi: 10.1016/j.beproc.2006.08.001. Epub 2006 Aug 7.
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.
本研究考察了光周期对成年斯普拉格-道利大鼠空间和时间记忆的影响，这些大鼠在不同的日长条件下受孕并饲养，即短日照（SD - 8:16光/暗）和长日照（LD - 16:8光/暗）。与SD大鼠相比，在12臂放射状迷宫任务中，达到标准所需选择次数较少，这表明雄性和雌性LD大鼠的空间记忆能力均有所提高。SD大鼠还表现出时间记忆内容的扭曲，这体现在使用峰间隔程序训练的20秒和60秒时间标准中出现比例性右移，这与胆碱能功能降低一致。结论是，空间和时间记忆对实验大鼠的光周期变化敏感，其方式与先前观察到的生殖行为相似。
