Interaural Time and Level Differences Contribute Differently to Source Segregation and Spatial Selection.
Interaural time and level differences are crucial in sound localization, yet their contributions to sound source segregation and spatial selection remain underspecified. Here, participants completed a spatial auditory selective attention task while we measured hemodynamic activity in the prefrontal...
| Publicado en: | Trends in Hearing Vol. 30; pp. 1 - 19 |
|---|---|
| Autores principales: | , , , , |
| Formato: | diagnostic images research tables/charts Journal Article |
| Publicado: |
Sage Publications Inc.
7/13/2026
|
| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=195361925&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 195361925 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 23312165 HCEJ jtl: Trends in Hearing issn: 23312165 maglogo: N pubinfo: dt: 7/13/2026 vid: 30 pid: 344 pub: Sage Publications Inc. place: Thousand Oaks, California artinfo: ui: 195361925 195361925 195361925 10.1177/23312165261464723 195361925 ppf: 1 ppct: 18 formats: tig: atl: Interaural Time and Level Differences Contribute Differently to Source Segregation and Spatial Selection. aug: au: Richardson, Benjamin N. Luthra, Sahil Kainerstorfer, Jana M. Shinn-Cunningham, Barbara G. Brown, Christopher A. affil: Neuroscience Institute, Carnegie Mellon University, Pittsburgh, PA, USA sug: subj: Auditory Perception Evaluation Sound Localization Evaluation Perceptual Distortion Evaluation Neurons Physiology Time Factors Task Performance and Analysis Selective Attention Evaluation Prefrontal Cortex Physiology Temporal Lobe Physiology Hemodynamics Evaluation Human Comparative Studies Neural Pathways Spectroscopy, Near-Infrared English Language Experimental Studies Male Female Adult Funding Source Dichotic Listening Tests Color Word Lists Acoustic Stimulation Descriptive Statistics Data Analysis Software Chi Square Test Post Hoc Analysis Paired T-Tests Adult: 19-44 years Male Female ab: Interaural time and level differences are crucial in sound localization, yet their contributions to sound source segregation and spatial selection remain underspecified. Here, participants completed a spatial auditory selective attention task while we measured hemodynamic activity in the prefrontal cortex and superior temporal gyrus using functional near-infrared spectroscopy. Participants listened to a target sound stream and a simultaneous spatially separated speech stream or white noise masker. Sound streams were spatialized with either 50 μs interaural time differences (ITDs), 500 μs ITDs, naturally occurring interaural level differences (ILDs) from a non-individualized head-related transfer function (HRTF), or broadband 10 dB ILDs. Behavioral results revealed a stronger effect of spatial cues when the masker was speech. Error patterns differed in the two difficult conditions, small ITDs and natural ILDs: Small ITDs produced lower hit rates, while naturally occurring ILDs produced higher false alarm rates. Small ITDs led to greater activity in prefrontal cortex and activity in superior temporal gyrus that was lateralized, greater in the hemisphere contralateral to attentional focus, consistent with previous reports. These results suggest that natural ILDs alone support source segregation even if they are insufficient to cause large shifts in perceived lateralization, explaining high false alarm rates (confusions between target and distractor words). In contrast, small ITDs alone may be insufficient to segregate competing sources, leading to low hit and false alarm rates. Together, these results reveal differences in how ITDs and ILDs contribute to auditory scene analysis and spatial attention. pubtype: Academic Journal doctype: diagnostic images research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
|---|