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Spatial hearing processing: electrophysiological documentation at subcortical and cortical levels.
Int J Neurosci 2019; 129(11):1119-1132IJ

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 underpinning SRM are 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 13 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.

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 this study, at least at the level of the cortex in future investigation.

Authors+Show Affiliations

HEARing Cooperation Research Centre , Melbourne , Australia. Department of Audiology and Speech Pathology, School of Health Sciences, University of Melbourne , Melbourne , Australia. National Acoustic Laboratories, Australian Hearing Hub, Macquarie University , Sydney , Australia. Department of Audiology, School of Rehabilitation, Tehran University of Medical Sciences, Pich-e Shemiran , Tehran , Iran.The New York Academy of Sciences , New York , NY , USA.Department of Biomedical Science, Faculty of Medicine and Health, The University of Sydney , Sydney , Australia.Department of Audiology, School of Health and Rehabilitation Sciences, The University of Queensland , Queensland , Australia.Department of Audiology, School of Health and Rehabilitation Sciences, The University of Queensland , Queensland , Australia.

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, vol. 129, no. 11, 2019, pp. 1119-1132.
Rouhbakhsh N, Mahdi J, Hwo J, et al. Spatial hearing processing: electrophysiological documentation at subcortical and cortical levels. Int J Neurosci. 2019;129(11):1119-1132.
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, 129(11), pp. 1119-1132. doi:10.1080/00207454.2019.1635129.
Rouhbakhsh N, et al. Spatial Hearing Processing: Electrophysiological Documentation at Subcortical and Cortical Levels. Int J Neurosci. 2019;129(11):1119-1132. 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 - 2019/07/19/ PY - 2019/6/25/pubmed PY - 2019/6/25/medline PY - 2019/6/25/entrez KW - Spatial release from masking KW - auditory brainstem response KW - cortical auditory evoked potential KW - frequency-following response KW - signal-to-noise ratio KW - spatial processing SP - 1119 EP - 1132 JF - The International journal of neuroscience JO - Int. J. Neurosci. VL - 129 IS - 11 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 underpinning SRM are 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 13 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. 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 this 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 -