Lateralization of function in auditory cortex has remained a persistent puzzle. Previous studies using signals with differing spectrotemporal characteristics support a model in which the left hemisphere is more sensitive to temporal and the right more sensitive to spectral stimulus attributes. Here we use single-trial sparse-acquisition fMRI and a stimulus with parametrically varying segmental structure affecting primarily temporal properties. We show that both left and right auditory cortices are remarkably sensitive to temporal structure. Crucially, beyond bilateral sensitivity to timing information, we uncover two functionally significant interactions. First, local spectrotemporal signal structure is differentially processed in the superior temporal gyrus. Second, lateralized responses emerge in the higher-order superior temporal sulcus, where more slowly modulated signals preferentially drive the right hemisphere. The data support a model in which sounds are analyzed on two distinct timescales, 25–50 ms and 200–300 ms.
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We thank P. Bandettini, J. Fritz, A.-L. Giraud, A. Martin and J. Rauschecker for insightful critical comments; F. Husain for help with experimental setup; and K.M. Boemio for her continued and continuous encouragement. A.B. and D.P. were supported by US National Institutes of Health R01 DC05660 to D.P. During the preparation of the manuscript, D.P. was a fellow at the Wissenschaftskolleg zu Berlin and the American Academy Berlin.
The authors declare no competing financial interests.
STS activation from single-subject ROI analysis. (PDF 102 kb)
Differential cortical connectivity model depicting hypothesized connectivity between areas STG and STS. (PDF 25 kb)
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