Use of a Sequential Strategy in Intelligibility Testing

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Abstract
In a recent experiment involving intelligibility testing, the response curve (intelligibility function) was found to flatten off sharply at moderately high intelligibilities. A sequential strategy of the up‐down‐transformed‐response (UDTR) type was used in order to concentrate observations in the symmetric region of the curve. The transformed‐response curve showed the departure from symmetry at a much higher intelligibility level. Precision of estimation for the 50% level was found to be higher than for the simple up‐and‐down procedure. The technique is designed for situations in which it is difficult or impossible to vary the step size.

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