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Some onset units respond primarily to the onset of the SFM. An OI unit is shown here, with BF = 9.1 kHz, SR = 0.0 spikes/s, T = 45 dB SPL. A, Pure tone PSTH (50 dB above threshold). B, Receptive field. C, PSTHs in response to 55 dB SPL SFM presented at BF, at 5 modulation depths: 2, 4, 8, 16, and 32% (in columns) and 3 modulation rates: 2, 5, and 10 Hz (in rows). An ongoing response can be seen only at the highest modulation depths (16 and 32%).
