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Human auditory cortex activity shows additive effects of spectral and spatial cues during speech segregation

Human auditory cortex activity shows additive effects of spe...

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中国神经科学学会第九届全国学术会议暨第五次会员代表大会

作者： bernhard ross Tim BARDOUILLE Claude ALAIN Department of Psychology University of TorontoOntarioM8V2S4Canada

Introduction In noisy social gatherings,listeners perceptually integrate sounds originating from one person’s voice(e.g.,fundamental frequency(f) and harmonics) at a particular location and segregate these from concurrent sounds of other *** increasing either the spectral(e.g.,f) or the spatial distance between talkers promotes speech segregation,the synergetic effect of having more than one cue available is less well *** We studied how spectral and/or spatial distances between 2 simultaneously presented steadystate vowels contribute to participants’ perception(accuracy of both vowels) and activation in auditory cortex using magnetoencephalography(MEG).Results Participants were more accurate in identifying both vowels when they differed in f and location than when they differed in a single cue only or when they shared the same f and location. The combined effect of f and location differences closely matched the sum of single *** improvement in concurrent vowel identification coincided with an object-related negativity(ORN) that peaked at about 140 ms after vowel *** combined effect of f and location on dipole source waveforms closely matched the sum of single effects even though vowels with different f,location,or both,generated different time courses of neuromagnetic *** model-free beamforming analysis provided converging evidence for summation of f and location cues in auditory cortices during speech *** We propose that during auditory scene analysis,acoustic differences among the various sources are combined linearly to increase the perceptual distance between the cooccurring sound objects.

关键词： MEG speech attention scene analysis streaming

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