Journal
JOURNAL OF NEUROPHYSIOLOGY
Volume 110, Issue 9, Pages 2019-2026Publisher
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/jn.00268.2013
Keywords
fMRI; natural addition; natural cognition; neural dynamics
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Funding
- Swartz Foundation
- Vrije Universiteit Amsterdam
- Okinawa Institute of Science and Technology
- National Institute of Mental Health [R01-MH-094480]
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We use functional magnetic resonance imaging (fMRI) to analyze neural responses to natural auditory stimuli. We characterize the fMRI time series through the shape of the voxel power spectrum and find that the timescales of neural dynamics vary along a spatial gradient, with faster dynamics in early auditory cortex and slower dynamics in higher order brain regions. The timescale gradient is observed through the unsupervised clustering of the power spectra of individual brains, both in the presence and absence of a stimulus, and is enhanced in the stimulus-locked component that is shared across listeners. Moreover, intrinsically faster dynamics occur in areas that respond preferentially to momentary stimulus features, while the intrinsically slower dynamics occur in areas that integrate stimulus information over longer timescales. These observations connect the timescales of intrinsic neural dynamics to the timescales of information processing, suggesting a temporal organizing principle for neural computation across the cerebral cortex.
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