Arolfo M P, Nerad L, Schenk F, Bures J
Department of Pharmacology, Faculty of Chemical Sciences, National University of Cordoba, Argentina.
Behav Neurosci. 1994 Apr;108(2):308-16. doi: 10.1037//0735-7044.108.2.308.
Contribution of visual and nonvisual mechanisms to spatial behavior of rats in the Morris water maze was studied with a computerized infrared tracking system, which switched off the room lights when the subject entered the inner circular area of the pool with an escape platform. Naive rats trained under light-dark conditions (L-D) found the escape platform more slowly than rats trained in permanent light (L). After group members were swapped, the L-pretrained rats found under L-D conditions the same target faster and eventually approached latencies attained during L navigation. Performance of L-D-trained rats deteriorated in permanent darkness (D) but improved with continued D training. Thus L-D navigation improves gradually by procedural learning (extrapolation of the start-target azimuth into the zero-visibility zone) but remains impaired by lack of immediate visual feedback rather than by absence of the snapshot memory of the target view.
利用计算机化红外跟踪系统研究了视觉和非视觉机制对大鼠在莫里斯水迷宫中空间行为的贡献，当实验对象进入带有逃生平台的水池内圆形区域时，该系统会关闭房间灯光。在明暗条件（L-D）下训练的未受过训练的大鼠找到逃生平台的速度比在持续光照（L）下训练的大鼠慢。在组成员交换后，预先在L条件下训练的大鼠在L-D条件下更快地找到相同目标，最终接近在L导航期间达到的潜伏期。在L-D条件下训练的大鼠在完全黑暗（D）环境中的表现变差，但随着持续的D训练而改善。因此，L-D导航通过程序学习（将起始目标方位外推到零能见度区域）逐渐改善，但仍然受到缺乏即时视觉反馈的影响，而不是缺乏目标视图的快照记忆。
