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Enhanced segregation of concurrent sounds with similar spectral uncertainties in individuals with autism spectrum disorder.

Lin IF, Yamada T, Komine Y, Kato N, Kashino M - Sci Rep (2015)

Bottom Line: Their superior performance in this task indicates an enhanced discrimination between auditory streams with the same spectral uncertainties but different spectro-temporal details.The enhanced discrimination of acoustic components may be related to the absence of the automatic grouping of acoustic components with the same features, which results in difficulties in speech perception in a noisy environment.On the other hand, the ASD group and the control group had similar performance in hearing a target sequence among distractors that had different spatial cues defined by interaural intensity differences.

View Article: PubMed Central - PubMed

Affiliation: NTT Communication Science Laboratories, NTT Corporation, Atsugi, Kanagawa, Japan.

ABSTRACT
When acoustic signals from different sound sources are mixed upon arrival at the ears, the auditory system organizes these acoustic elements by their features. This study shows that individuals with autism spectrum disorder (ASD) performed better in terms of hearing a target sequence among distractors that had similar spectral uncertainties. Their superior performance in this task indicates an enhanced discrimination between auditory streams with the same spectral uncertainties but different spectro-temporal details. The enhanced discrimination of acoustic components may be related to the absence of the automatic grouping of acoustic components with the same features, which results in difficulties in speech perception in a noisy environment. On the other hand, the ASD group and the control group had similar performance in hearing a target sequence among distractors that had different spatial cues defined by interaural intensity differences.

No MeSH data available.


Related in: MedlinePlus

The auditory stimuli contained one target sequence (black lines) and eight masker sequences (gray lines). The target sequence always had jittered frequencies within a fixed protected region. (A) The masker sequences had jittered frequencies outside the protected region for the jittered conditions. (B) The masker sequencies had fixed frequencies outside the protected region for the non-jittered conditions.
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f1: The auditory stimuli contained one target sequence (black lines) and eight masker sequences (gray lines). The target sequence always had jittered frequencies within a fixed protected region. (A) The masker sequences had jittered frequencies outside the protected region for the jittered conditions. (B) The masker sequencies had fixed frequencies outside the protected region for the non-jittered conditions.

Mentions: In the experiment, the threshold for detecting the target among the maskers was measured by using an adaptive staircase procedure with a 3-down 1-up rule. The target sequence always had jittered frequencies and was sent only to the right ear. The masking sequences either had jittered frequencies (i.e., the jittered conditions shown in Fig. 1A) or had the same frequencies (i.e., the non-jittered conditions shown in Fig. 1B). For the monotic conditions, the maskers were sent to the right ear, and the target and maskers shared the same spatial cues. For the diotic conditions, the maskers were sent to both ears, and the target and maskers had different spatial cues. Listeners should perform better under the non-jittered conditions than under the jittered conditions if they can segregate acoustic signals carrying different spectral uncertainties, and they should perform better under the diotic conditions than under the monotic conditions if they can segregate acoustic signals carrying different spatial cues. On the other hand, if the participants with ASD did not group acoustic signals with similar spectral uncertainties automatically, their performance for the jittered condition should be better than that of the control group.


Enhanced segregation of concurrent sounds with similar spectral uncertainties in individuals with autism spectrum disorder.

Lin IF, Yamada T, Komine Y, Kato N, Kashino M - Sci Rep (2015)

The auditory stimuli contained one target sequence (black lines) and eight masker sequences (gray lines). The target sequence always had jittered frequencies within a fixed protected region. (A) The masker sequences had jittered frequencies outside the protected region for the jittered conditions. (B) The masker sequencies had fixed frequencies outside the protected region for the non-jittered conditions.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4441195&req=5

f1: The auditory stimuli contained one target sequence (black lines) and eight masker sequences (gray lines). The target sequence always had jittered frequencies within a fixed protected region. (A) The masker sequences had jittered frequencies outside the protected region for the jittered conditions. (B) The masker sequencies had fixed frequencies outside the protected region for the non-jittered conditions.
Mentions: In the experiment, the threshold for detecting the target among the maskers was measured by using an adaptive staircase procedure with a 3-down 1-up rule. The target sequence always had jittered frequencies and was sent only to the right ear. The masking sequences either had jittered frequencies (i.e., the jittered conditions shown in Fig. 1A) or had the same frequencies (i.e., the non-jittered conditions shown in Fig. 1B). For the monotic conditions, the maskers were sent to the right ear, and the target and maskers shared the same spatial cues. For the diotic conditions, the maskers were sent to both ears, and the target and maskers had different spatial cues. Listeners should perform better under the non-jittered conditions than under the jittered conditions if they can segregate acoustic signals carrying different spectral uncertainties, and they should perform better under the diotic conditions than under the monotic conditions if they can segregate acoustic signals carrying different spatial cues. On the other hand, if the participants with ASD did not group acoustic signals with similar spectral uncertainties automatically, their performance for the jittered condition should be better than that of the control group.

Bottom Line: Their superior performance in this task indicates an enhanced discrimination between auditory streams with the same spectral uncertainties but different spectro-temporal details.The enhanced discrimination of acoustic components may be related to the absence of the automatic grouping of acoustic components with the same features, which results in difficulties in speech perception in a noisy environment.On the other hand, the ASD group and the control group had similar performance in hearing a target sequence among distractors that had different spatial cues defined by interaural intensity differences.

View Article: PubMed Central - PubMed

Affiliation: NTT Communication Science Laboratories, NTT Corporation, Atsugi, Kanagawa, Japan.

ABSTRACT
When acoustic signals from different sound sources are mixed upon arrival at the ears, the auditory system organizes these acoustic elements by their features. This study shows that individuals with autism spectrum disorder (ASD) performed better in terms of hearing a target sequence among distractors that had similar spectral uncertainties. Their superior performance in this task indicates an enhanced discrimination between auditory streams with the same spectral uncertainties but different spectro-temporal details. The enhanced discrimination of acoustic components may be related to the absence of the automatic grouping of acoustic components with the same features, which results in difficulties in speech perception in a noisy environment. On the other hand, the ASD group and the control group had similar performance in hearing a target sequence among distractors that had different spatial cues defined by interaural intensity differences.

No MeSH data available.


Related in: MedlinePlus