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Atypical delayed auditory feedback effect and Lombard effect on speech production in high-functioning adults with autism spectrum disorder.

Lin IF, Mochida T, Asada K, Ayaya S, Kumagaya S, Kato M - Front Hum Neurosci (2015)

Bottom Line: We also examined feedforward control by adding loud pink noise to the auditory feedback, which led to increased vocal effort in producing speech.The results of Japanese speakers show that, compared with neurotypical (NT) individuals, high-functioning adults with ASD (including Asperger's disorder, autistic disorder, and pervasive developmental disorder not otherwise specified) were more affected by delayed auditory feedback but less affected by external noise.These findings indicate that, in contrast to NT individuals, those with ASD relied more on feedback control than on feedforward control in speech production, which is consistent with the hypothesis that this population exhibits attenuated Bayesian priors.

View Article: PubMed Central - PubMed

Affiliation: Human and Information Science Laboratory, NTT Communication Science Laboratories Atsugi, Japan.

ABSTRACT
Individuals with autism spectrum disorder (ASD) show impaired social interaction and communication, which may be related to their difficulties in speech production. To investigate the mechanisms of atypical speech production in this population, we examined feedback control by delaying the auditory feedback of their own speech, which degraded speech fluency. We also examined feedforward control by adding loud pink noise to the auditory feedback, which led to increased vocal effort in producing speech. The results of Japanese speakers show that, compared with neurotypical (NT) individuals, high-functioning adults with ASD (including Asperger's disorder, autistic disorder, and pervasive developmental disorder not otherwise specified) were more affected by delayed auditory feedback but less affected by external noise. These findings indicate that, in contrast to NT individuals, those with ASD relied more on feedback control than on feedforward control in speech production, which is consistent with the hypothesis that this population exhibits attenuated Bayesian priors.

No MeSH data available.


Related in: MedlinePlus

The effect of the delay of auditory feedback on syllable number (above) and duration ratio (below) in two groups in the voiced delayed auditory feedback (DAF) experiment (A,C) and in the whispered DAF experiment (B,D). While the delay increased up to 200 ms, the syllable number and the duration ratio increased in both groups, indicated as mean ± standard error. For the voiced DAF experiment, the syllable number and the duration ratio increased more in the ASD group (black dashed lines) than in the control group (gray solid lines), but there was no such difference for the whispered DAF experiment.
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Figure 1: The effect of the delay of auditory feedback on syllable number (above) and duration ratio (below) in two groups in the voiced delayed auditory feedback (DAF) experiment (A,C) and in the whispered DAF experiment (B,D). While the delay increased up to 200 ms, the syllable number and the duration ratio increased in both groups, indicated as mean ± standard error. For the voiced DAF experiment, the syllable number and the duration ratio increased more in the ASD group (black dashed lines) than in the control group (gray solid lines), but there was no such difference for the whispered DAF experiment.

Mentions: Figures 1A,C shows that the syllable number and the duration ratio increased in both groups and peaked at 200-ms delay. In addition, the responses to DAF were larger in the ASD group (the black dash lines) than in the control group (the gray solid lines).


Atypical delayed auditory feedback effect and Lombard effect on speech production in high-functioning adults with autism spectrum disorder.

Lin IF, Mochida T, Asada K, Ayaya S, Kumagaya S, Kato M - Front Hum Neurosci (2015)

The effect of the delay of auditory feedback on syllable number (above) and duration ratio (below) in two groups in the voiced delayed auditory feedback (DAF) experiment (A,C) and in the whispered DAF experiment (B,D). While the delay increased up to 200 ms, the syllable number and the duration ratio increased in both groups, indicated as mean ± standard error. For the voiced DAF experiment, the syllable number and the duration ratio increased more in the ASD group (black dashed lines) than in the control group (gray solid lines), but there was no such difference for the whispered DAF experiment.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4585204&req=5

Figure 1: The effect of the delay of auditory feedback on syllable number (above) and duration ratio (below) in two groups in the voiced delayed auditory feedback (DAF) experiment (A,C) and in the whispered DAF experiment (B,D). While the delay increased up to 200 ms, the syllable number and the duration ratio increased in both groups, indicated as mean ± standard error. For the voiced DAF experiment, the syllable number and the duration ratio increased more in the ASD group (black dashed lines) than in the control group (gray solid lines), but there was no such difference for the whispered DAF experiment.
Mentions: Figures 1A,C shows that the syllable number and the duration ratio increased in both groups and peaked at 200-ms delay. In addition, the responses to DAF were larger in the ASD group (the black dash lines) than in the control group (the gray solid lines).

Bottom Line: We also examined feedforward control by adding loud pink noise to the auditory feedback, which led to increased vocal effort in producing speech.The results of Japanese speakers show that, compared with neurotypical (NT) individuals, high-functioning adults with ASD (including Asperger's disorder, autistic disorder, and pervasive developmental disorder not otherwise specified) were more affected by delayed auditory feedback but less affected by external noise.These findings indicate that, in contrast to NT individuals, those with ASD relied more on feedback control than on feedforward control in speech production, which is consistent with the hypothesis that this population exhibits attenuated Bayesian priors.

View Article: PubMed Central - PubMed

Affiliation: Human and Information Science Laboratory, NTT Communication Science Laboratories Atsugi, Japan.

ABSTRACT
Individuals with autism spectrum disorder (ASD) show impaired social interaction and communication, which may be related to their difficulties in speech production. To investigate the mechanisms of atypical speech production in this population, we examined feedback control by delaying the auditory feedback of their own speech, which degraded speech fluency. We also examined feedforward control by adding loud pink noise to the auditory feedback, which led to increased vocal effort in producing speech. The results of Japanese speakers show that, compared with neurotypical (NT) individuals, high-functioning adults with ASD (including Asperger's disorder, autistic disorder, and pervasive developmental disorder not otherwise specified) were more affected by delayed auditory feedback but less affected by external noise. These findings indicate that, in contrast to NT individuals, those with ASD relied more on feedback control than on feedforward control in speech production, which is consistent with the hypothesis that this population exhibits attenuated Bayesian priors.

No MeSH data available.


Related in: MedlinePlus