Two studies which showed significant extra-maze pre-exposure effects are reported. In Exp. 1 hooded rats were exposed to one stimulus and then given a choice between that stimulus and a non-exposed stimulus. Exposure brightness and exposure time were varied and number of changes between the two stimulus areas and time spent in each area were measured. In Exp. 2 rats were exposed to a stimulus and then given a choice between the same area, an area with a similar stimulus and an area with a dissimilar stimulus. Both exposure brightness and exposure time affected choice latency and time in the dissimilar area.
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