FRACTIONATING THE NONSPATIAL PRETRAINING EFFECT IN THE WATER MAZE TASK

Nonspatial pretraining (NSP) enables rats to learn the general strateg ies of the water maze task (WMT; e.g., learning to swim away from the wall and to climb onto the hidden platform), reduces sensorimotor dist urbances, and eliminates acquisition impairments caused by scopolamine hydrobromide, a muscarinic antagonist. To evaluate the contributions of the components of NSP to these effects, NSP was fractionated so tha t different groups of male rats swam, were placed onto the hidden plat form, climbed onto the hidden platform, or were placed into an empty m aze before spatial training under scopolamine. No single component of the NSP procedure was sufficient to produce its full effects on sensor imotor disturbances and WMT acquisition. Experience with most or perha ps all of the specific behaviors required in the WMT appears to be imp ortant for NSP to produce its full effects.