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Oscilloscope traces (left) and computer averaged (right) LGN and EMG responses to a 115 dB click (S) with and without a preceding 80 dB click prestimulus (P) in quiet waking. The interval between the prestimulus and the startle-eliciting stimulus was 100 msec. The total durations of the oscilloscope and computer-averaged traces were both 500 ms.
