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Prevalence of facilitation and suppression by FM sweeps in the preferred (left) and nonpreferred (right) directions as a function of modulation rate/stimulus duration. Facilitation and suppression were defined as an increase or decrease in response relative to BEF tone burst control by ≥20%. Suppression dominated for both preferred, and especially, nonpreferred sweeps. Facilitation for preferred sweeps was seen in 1/5 to 1/3 of the units, depending on modulation rate.
