Two procedures for estimating internal noise

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Abstract
Internal noise was measured in 2 paradigms simultaneously. In one method the listener''s agreement in choosing the same masker as the one in a pair that sounds most signal-like was used to estimate internal noise. In the other the increment in detection performance on those trials having identical as opposed to different maskers was used to estimate internal noise. Most results place the estimate of additive internal noise as nearly equal to the external noise variability. The estimates from the agreement method can be adversely affected by uncertainty regarding the observation interval and interval biases, whereas the estimates obtained with the detection method are highly sensitive to measurement errors.

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