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Presentation rate (PR) represents the number of sound stimuli within the unit time.It is one of the essential indexes reflecting acoustical energy and information received by auditory system in a given time.Our recent investigations have shown that the temporal properties of inferior collicular (IC) neurons responding to the pure tone bursts are closely correlated to PR.The frequency modulated sweeps (FMs) share major dynamic parts in both human languages and animal communicating sounds.The modulation range (MR) and sweep directions of FMs, which are important temporal features of FMs, play key roles in speech distinguish in human.Although neuronal selectivity of MRs and sweep directions has been intensively studied in echolocating bats, whether the PR could modulate the neuronal selectivity of the FM remains unclear.In present study we addressed it in the mouse inferior colliculus (IC).