Article: article from journal or magazin.
Absence of snapshot memory of the target view interferes with place navigation learning by rats in the water maze
Journal Article Research Support, Non-U.S. Gov't --- Old month value: Apr
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.
Animals *Attention *Cues Dark Adaptation Discrimination Learning *Escape Reaction Male *Memory, Short-Term *Orientation Rats Reaction Time Retention (Psychology) *Visual Perception
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