Duration Discrimination in the Rat after Early Auditory Restriction

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To test the hypothesis that cumulative early exposure to patterned auditory stimulation is necessary for the development of auditory duration perception in the rat, 40 hooded rats from the Long-Evans strain were raised from birth to 60 days in sound resistant lockers with ear plugs introduced into their external auditory canals. The remaining 20 Ss were raised with the auditory input of the laboratory colony. Although auditorily restricted Ss learned an intensity discrimination as readily as did normally reared Ss, experimental Ss took significantly more trials than normals to learn a duration discrimination problem.

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