Table 1.
Sample demographics.
Table 2.
Multitalker speech perception thresholds (TMR in dB) and WASI-II Full Scale IQ (FSIQ-4) by FASD diagnoses for participants in the FASD group [24,26].
Fig 1.
Schematic diagram of trial configuration and response panel.
A) Participants heard three simultaneous sentences, with the target talker in front at 0° azimuth presented with two spatially separated simultaneous competing talkers, “maskers”, on each side at ±45° azimuth. B) Participants were asked to identify via mouse click the color and number spoken by the target talker on a computer screen.
Fig 2.
Speech perception thresholds (TMR at 50%) as a function of group.
The Autism group is in blue (left), the Comparison group is in red (middle), and the FASD group is in orange (right).
Fig 3.
Speech perception performance improves with higher intellectual ability.
A) Individual speech perception thresholds (TMR at 50% correct) as a function of intellectual ability (WASI-II FSIQ-4), with Autism group in blue, Comparison group in red, and FASD group in orange. Negative TMRs reflect better speech perception performance. Intellectual ability was correlated with TMR in the overall sample. B-D) Speech perception thresholds as a function of intellectual ability for the Autism (B), Comparison (C), and FASD (D) groups. Individual data points shown with solid circles. FSIQ-4 was correlated with TMR in Autism, Comparison, and FASD groups.
Fig 4.
Speech perception performance correlated with both verbal and nonverbal abilities.
Individual data points shown with solid circles. A) Verbal comprehension as a function of multitalker speech perception performance. WASI-II VCI was significantly correlated with TMR. B) Perceptual reasoning ability as a function of multitalker speech perception performance. WASI-II PRI was significantly correlated with TMR.
Table 3.
Mean WASI-II subtest T scores by group with standard deviation shown in parenthesis.
Fig 5.
Speech perception performance correlated with performance on all subtests of the WASI-II.
Individual data points shown with solid circles. A) Block Design subtest T Score as a function of TMR. B) Similarities subtest T Score as a function of TMR. C) Matrix reasoning subtest T Score as a function of TMR. D) Vocabulary subtest T Score as a function of TMR.