Abstract

Sorting is an efficient procedure for rank ordering stimuli along a subjective continuum; moreover, this efficiency leads to enhanced subject motivation and greater reliability. A sorting procedure for auditory stimuli was implemented on a laboratory computer with mope display, magnetic disk for random access to digitally recorded stimuli, and digital-to-analog playback. The procedure initially presents a subject with a “list” of two stimuli which he must order. Subsequent stimuli are added one at a time to the bottom of the already-ordered list. The subject must then insert the new stimulus into its proper order in the list. Ordering is done by rearranging a displayed list of labels that correspond to the auditory stimuli. Any stimulus can be heard at any time by pointing to its label in the display. The procedure was used to obtain preference, comprehensibility, and naturalness judgments of synthetic speech with independent pitch, formant, and timing manipulation.

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