Hierarchical Organization of the Human Auditory Cortex Revealed by Functional Magnetic Resonance Imaging

Authors:
C. M. Wessinger;J. Vanmeter;B. Tian;J. Van Lare;J. Pekar;J. P. Rauschecker
Affiliations:
Georgetown Institute for Cognitive and Computational Sciences, Georgetown University Medical Center, Dartmouth College and Medical School;Georgetown Institute for Cognitive and Computational Sciences, Georgetown University Medical Center;Georgetown Institute for Cognitive and Computational Sciences, Georgetown University Medical Center;Georgetown Institute for Cognitive and Computational Sciences, Georgetown University Medical Center;Georgetown Institute for Cognitive and Computational Sciences, Georgetown University Medical Center, Johns Hopkins University and Kennedy Krieger Institute;Georgetown Institute for Cognitive and Computational Sciences, Georgetown University Medical Center
Venue:
Journal of Cognitive Neuroscience
Year:
2001

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Abstract

The concept of hierarchical processing - that the sensory world is broken down into basic features later integrated into more complex stimulus preferences - originated from investigations of the visual cortex. Recent studies of the auditory cortex in nonhuman primates revealed a comparable architecture, in which core areas, receiving direct input from the thalamus, in turn, provide input to a surrounding belt. Here functional magnetic resonance imaging (fMRI) shows that the human auditory cortex displays a similar hierarchical organization: pure tones (PTs) activate primarily the core, whereas belt areas prefer complex sounds, such as narrow-band noise bursts.