Abstract
Measuring Speech-Reception Threshold (SRT) using adaptive procedures is popular, as testing yield results with desirable statistical properties. However, SRT measures have drawbacks related to the unbounded nature of the Signal-to-Noise Ratio (SNR) at which the SRT is achieved. Often the SRT will be a double-digit negative number, which compromises the ecological validity of the result. If testing involves hearing aids, it means that these devices and the signal-processing algorithms in them may be operating in conditions for which they were not intended. Further, the commonly observed large spread in SRT (both between- and within-group) has the possibility to cause SNR confounds that may lead to faulty conclusions. One way to address these issues is to provide the experimenter with SRT manipulators, to control the SNR at which testing takes place for the individual listener. The present work aims at developing a spatial speech-in-speech test with a selection of SRT manipulators for the experimenter to choose from. The manipulators investigated in this study are; the spatial separation between target and maskers, the number of spatially separated maskers, changing the masker gender, and scoring in words versus sentences. The magnitudes of the SRT manipulators were investigated using 20 hearing-aid users as listeners.
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