Speech tests are presented at levels where listeners perform worst
Evidence
The CAPT is a four-alternative-forced-choice monosyllabic word-discrimination test spoken by a female British English speaker. It contained ten sets of four minimally-contrastive real words; eight sets with a contrastive consonant, e.g. fat, bat, cat, mat and two sets with a contrastive vowel, e.g. cat, cot, cut, cart. The participant selected from four pictures on a computer screen. The d’ score was calculated. Stimuli were presented at 50 dBA in quiet; a level selected in pilot work because it resulted in performance falling on the slope of the psychometric function. — Dijk, Pim van, Physiology, Psychoacoustics and…, 2080
Categorization
Category: Definitional Content
- DEFINE: Explains the CAPT test structure and why 50 dBA was chosen.
Related
- Word discrimination testing uses minimal pair contrasts to reveal spectral resolution (similarity 0.84)
- Word-discrimination tests use minimal pairs to isolate consonant and vowel contrasts. (similarity 0.81)
- Word discrimination can be measured with a picture-pointing forced-choice test using minimally contrastive pairs. (similarity 0.78)
Broader Connections
- A higher required signal-to-noise ratio indicates worse speech-in-noise performance.
#expands(0.80) — Dijk, Pim van, Physiology, Psychoacoustics and…, 4172 - Level differences at typical MAAs stay below just-noticeable-differences for hearing-impaired listeners
#complicates(0.72) — Dijk, Pim van, Physiology, Psychoacoustics and…, 3052