sone relationships to stimulus discrimination in noise.

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Abstract
Monkeys, trained to discriminate between human speech sounds presented at 70 dB SPL in 2400 Hz low-pass noise of different intensities, were found significantly impaired in their performance following surgical section of the OCB. There is absolutely no loss in the ability to discriminate between the signals when noise is absent or at low intensity levels. The deficit is related to "perceptual" (as opposed to physical) signal-to-noise ratio: high intensity noise per se is insufficient to cause performance decrement if its passband provides inadequate masking of the speech stimuli (e.g., 2400 Hz high-pass). The magnitude of the post-operative deficit is apparently related to the extent of destruction of the fibers of the OCB.

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