A repeated sentence is more intelligible on second hearing

Evidence

The results, including 95 % within-subject confidence intervals, are shown in the left panel of Fig. 1 . Ratings increase near linearly as a function of ΔSNR, and are asymmetric: when the + ΔSNR interval preceded the reference, ratings were less than when the + ΔSNR interval followed the reference (e.g., when the second interval was the better SNR, ratings were greater than one increment at a ΔSNR of 4 dB, but when the second interval was the worse SNR, ratings were greater than one increment only when ΔSNR was 8 dB). This asymmetry was most likely due to an order effect; the second iteration of a sentence has been shown to be more intelligible (e.g., Thwing 1956 ), hence second-interval deficits would be deflated, and second-interval benefits inflated. Regarding the JMD, the ratings significantly increased only at 4 dB, regardless of order, lending support to the notion of detectability being a requisite for meaningfulness. SNR JNDs for these participants, however, were not well correlated with their individual mean responses at any ΔSNR. — Dijk, Pim van, Physiology, Psychoacoustics and…, 5688

Ratings increase near linearly as a function of ΔSNR, and are asymmetric: when the + ΔSNR interval preceded the reference, ratings were less than when the + ΔSNR interval followed the reference (e.g., when the second interval was the better SNR, ratings were greater than one increment at a ΔSNR of 4 dB, but when the second interval was the worse SNR, ratings were greater than one increment only when ΔSNR was 8 dB). This asymmetry was most likely due to an order effect; the second iteration of a sentence has been shown to be more intelligible (e.g., Thwing 1956 ), hence second-interval deficits would be deflated, and second-interval benefits inflated. Regarding the JMD, the ratings significantly increased only at 4 dB, regardless of order, lending support to the notion of detectability being a requisite for meaningfulness. — Dijk, Pim van, Physiology, Psychoacoustics and…, 5686

Categorization

• XREF: Connects to the chapter’s central thesis that detectability thresholds for SNR changes set the floor for meaningful intelligibility ratings.
• QUESTION: This order/learning effect on sentence intelligibility could interact with clinical speech testing. Worth chasing how large the second-presentation boost is.
• corroborated: 2 independent passages support this claim — Dijk, Pim van, Physiology, Psychoacoustics and…, 5688; Dijk, Pim van, Physiology, Psychoacoustics and…, 5686