Acoustically Enriched Environment during the Critical Period of Postnatal Development Positively Modulates Gap Detection and Frequency Discrimination Abilities in Adult Rats.

When tone pulses were used as startling stimuli, the magnitude of ASR exhibited a decreasing trend with increasing stimulus frequency in both the enriched and control rats: the 16 kHz tones evoked considerably weaker ASR than the 6 kHz tones, particularly in the range between 100 and 120 dB SPL; the amplitude-intensity curves for these frequencies were significantly different within each experimental group ( Figure 2(b) vs.

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