期刊
CEREBRAL CORTEX
卷 20, 期 3, 页码 583-590出版社
OXFORD UNIV PRESS INC
DOI: 10.1093/cercor/bhp124
关键词
attention; fMRI; pitch; space; speech
资金
- National Institutes of Health: National Institute on Deafness and other Communication Disorders [R01-DC8171, T32DC8072-01A2]
In realistic auditory environments, people rely on both attentional control and attentional selection to extract intelligible signals from a cluttered background. We used functional magnetic resonance imaging to examine auditory attention to natural speech under such high processing-load conditions. Participants attended to a single talker in a group of 3, identified by the target talker's pitch or spatial location. A catch-trial design allowed us to distinguish activity due to top-down control of attention versus attentional selection of bottom-up information in both the spatial and spectral (pitch) feature domains. For attentional control, we found a left-dominant fronto-parietal network with a bias toward spatial processing in dorsal precentral sulcus and superior parietal lobule, and a bias toward pitch in inferior frontal gyrus. During selection of the talker, attention modulated activity in left intraparietal sulcus when using talker location and in bilateral but right-dominant superior temporal sulcus when using talker pitch. We argue that these networks represent the sources and targets of selective attention in rich auditory environments.
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