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Hemodynamic responses link individual differences in informational masking to the vicinity of superior temporal gyrus

Min Zhang, Nima Alamatsaz, View ORCID ProfileAntje Ihlefeld
doi: https://doi.org/10.1101/2020.08.21.261222
Min Zhang
1New Jersey Institute of Technology
2Rutgers University
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Nima Alamatsaz
1New Jersey Institute of Technology
2Rutgers University
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Antje Ihlefeld
1New Jersey Institute of Technology
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  • ORCID record for Antje Ihlefeld
  • For correspondence: ihlefeld@njit.edu
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Abstract

Suppressing unwanted background sound is crucial for aural communication. Public spaces often contain a particularly disruptive background sound, called informational masking (IM). At present, IM is identified operationally: when a target should be audible, based on suprathreshold target/masker energy ratios, yet cannot be heard because perceptually similar background sound interferes. Here, behavioral experiments combined with functional near infrared spectroscopy identify brain regions that predict individual vulnerability to IM. Results show that tasked-evoked blood oxygenation changes near the superior temporal gyrus (STG) and behavioral speech detection performance covary for same-ear IM background sound, suggesting that the STG is part of an IM-dependent network. Moreover, listeners who are more vulnerable to IM show an increased metabolic need for oxygen near STG. In contrast, task-evoked responses in a region of lateral frontal cortex, the caudal inferior frontal sulcus (cIFS), do not predict behavioral sensitivity, suggesting that the cIFS belongs to an IM-independent network.

Competing Interest Statement

The authors have declared no competing interest.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. All rights reserved. No reuse allowed without permission.
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Posted August 23, 2020.
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Hemodynamic responses link individual differences in informational masking to the vicinity of superior temporal gyrus
Min Zhang, Nima Alamatsaz, Antje Ihlefeld
bioRxiv 2020.08.21.261222; doi: https://doi.org/10.1101/2020.08.21.261222
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Hemodynamic responses link individual differences in informational masking to the vicinity of superior temporal gyrus
Min Zhang, Nima Alamatsaz, Antje Ihlefeld
bioRxiv 2020.08.21.261222; doi: https://doi.org/10.1101/2020.08.21.261222

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