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Spatial Hearing processing: Electrophysiological documentation at subcortical and cortical levels.

Abstract

Objective:

Recognition of target signal improves when the target and distracted sources are spatially separated; an effect defined as 'spatial release from masking' (SRM). The neural mechanisms underpin SRM is complicated and still need to be identified. The aim of this study was to identify whether objective correlates of SRM can be recorded in either the brainstem or cortex (or both). Materials and

Methods:

In response to 200 target stimulus blocks, auditory brainstem responses (ABRs), frequency-following responses (FFRs), and cortical auditory evoked potentials (CAEPs) were recorded concurrently from thirteen normally hearing adults utilizing two stimulus patterns, flat and staircase, in the presence of randomized distractors at -5, 0, 5, 10 and 15 dB SNR, and in co-located and separated spatial locations(1).

Results:

FFR F0 amplitude increased for the flat stimuli at -5 dB SNR, ABR wave V latency decreased for both flat and staircase stimuli in all SNRs and for P1 and N1 latencies due to the noisy CAEPs, drawing any significant conclusion could be subject to further investigation.

Conclusion:

These findings suggest that SRM can be objectively recorded concurrently in both the brainstem and auditory cortex, it is speculated that the central auditory system can suppress background noise based on spatial information commencing from the brainstem and that this capability is remarkable in more difficulty listing situations. This study may pave the way to evaluate spatial processing electrophysiologically utilizing FFR amplitude, ABR and CAEPs latencies condition to confirmation of the results of current study, at least at the level of the cortex in future investigation.

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  • Authors+Show Affiliations

    ,

    a HEARing Cooperation Research Centre , Melbourne , Victoria , Australia. b University of Melbourne , Melbourne , Victoria , Australia. c National Acoustic Laboratories, Australian Hearing Hub , 16 University Avenue , Macquarie University , NSW 2109 , Sydney , Australia . d Department of Audiology, School of Rehabilitation , Tehran University of Medical Sciences, Pich-e Shemiran , Enghelab Ave., Tehran , Iran .

    ,

    e The New York Academy of Sciences , 7 World Trade Center, 250 Greenwich Street, 40th floor , New York , USA .

    ,

    f Department of Biomedical Science, Faculty of Medicine and Health , The University of Sydney , Sydney , Australia .

    ,

    g Department of Audiology, School of Health and Rehabilitation Sciences , The University of Queensland , Queensland , Australia .

    g Department of Audiology, School of Health and Rehabilitation Sciences , The University of Queensland , Queensland , Australia .

    Source

    Pub Type(s)

    Journal Article

    Language

    eng

    PubMed ID

    31232638

    Citation

    Rouhbakhsh, Nematollah, et al. "Spatial Hearing Processing: Electrophysiological Documentation at Subcortical and Cortical Levels." The International Journal of Neuroscience, 2019, pp. 1-17.
    Rouhbakhsh N, Mahdi J, Hwo J, et al. Spatial Hearing processing: Electrophysiological documentation at subcortical and cortical levels. Int J Neurosci. 2019.
    Rouhbakhsh, N., Mahdi, J., Hwo, J., Nobel, B., & Mousave, F. (2019). Spatial Hearing processing: Electrophysiological documentation at subcortical and cortical levels. The International Journal of Neuroscience, pp. 1-17. doi:10.1080/00207454.2019.1635129.
    Rouhbakhsh N, et al. Spatial Hearing Processing: Electrophysiological Documentation at Subcortical and Cortical Levels. Int J Neurosci. 2019 Jun 24;1-17. PubMed PMID: 31232638.
    * Article titles in AMA citation format should be in sentence-case
    TY - JOUR T1 - Spatial Hearing processing: Electrophysiological documentation at subcortical and cortical levels. AU - Rouhbakhsh,Nematollah, AU - Mahdi,John, AU - Hwo,Jacob, AU - Nobel,Baran, AU - Mousave,Fati, Y1 - 2019/06/24/ PY - 2019/6/25/entrez KW - Spatial release from masking (SRM) KW - auditory brainstem response (ABR) KW - cortical auditory evoked potential (CAEP) KW - frequency-following response (FFR) KW - signal-to-noise ratio (SNR) KW - spatial processing SP - 1 EP - 17 JF - The International journal of neuroscience JO - Int. J. Neurosci. N2 - Objective: Recognition of target signal improves when the target and distracted sources are spatially separated; an effect defined as 'spatial release from masking' (SRM). The neural mechanisms underpin SRM is complicated and still need to be identified. The aim of this study was to identify whether objective correlates of SRM can be recorded in either the brainstem or cortex (or both). Materials and Methods: In response to 200 target stimulus blocks, auditory brainstem responses (ABRs), frequency-following responses (FFRs), and cortical auditory evoked potentials (CAEPs) were recorded concurrently from thirteen normally hearing adults utilizing two stimulus patterns, flat and staircase, in the presence of randomized distractors at -5, 0, 5, 10 and 15 dB SNR, and in co-located and separated spatial locations(1). Results: FFR F0 amplitude increased for the flat stimuli at -5 dB SNR, ABR wave V latency decreased for both flat and staircase stimuli in all SNRs and for P1 and N1 latencies due to the noisy CAEPs, drawing any significant conclusion could be subject to further investigation. Conclusion: These findings suggest that SRM can be objectively recorded concurrently in both the brainstem and auditory cortex, it is speculated that the central auditory system can suppress background noise based on spatial information commencing from the brainstem and that this capability is remarkable in more difficulty listing situations. This study may pave the way to evaluate spatial processing electrophysiologically utilizing FFR amplitude, ABR and CAEPs latencies condition to confirmation of the results of current study, at least at the level of the cortex in future investigation. SN - 1563-5279 UR - https://www.unboundmedicine.com/medline/citation/31232638/Spatial_Hearing_processing:_Electrophysiological_documentation_at_subcortical_and_cortical_levels L2 - http://www.tandfonline.com/doi/full/10.1080/00207454.2019.1635129 DB - PRIME DP - Unbound Medicine ER -