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    <title>Hierarchical Organization of Human Auditory Cortex Revealed by Functional Magnetic Resonance Imaging</title>
    <description>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.</description>
    <publisher>Journal of Cognitive Neuroscience</publisher>
    <contributor order="1">Wessinger CM</contributor>
    <contributor order="2">VanMeter J</contributor>
    <contributor order="3">Tian B</contributor>
    <contributor order="4">Van Lare J</contributor>
    <contributor order="5">Pekar J</contributor>
    <contributor order="6">Rauschecker JP</contributor>
    <date>January 1, 2001</date>
    <type>Journal</type>
    <identifier>PMID: 11224904</identifier>
    <identifier>J Cogn Neurosci. 2001 Jan 1;13(1):1-7.</identifier>
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   <description>Four participants underwent 12 functional runs, with each run consisting of four 32-second cycles divided into 16-second stimulus-ON and stimulus-OFF epochs (for a total time of 128 seconds per functional run). In order to minimize functional activation associated with the scanner sound, a sparsesampling technique was used that allowed for silence between volume acquisitions, that is, a repetition time (TR) of 8000 ms was used, with volume collection being accomplished during the first 2000 ms. Thus, two timepoints were collected during each 16-second epoch, resulting in 16 timepoints per functional run, resulting in a total of 192 timepoints being collected for each participant. Seven participants underwent six functional runs, with each run consisting of eight 32-second cycles divided into 16-second stimulus-ON and stimulus-OFF epochs (for a total time of 256 seconds per functional run). The same sparse sampling technique described above was used, resulting in 32 timepoints per functional run, resulting in a total of 192 timepoints being collected for each participant.</description>
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   <subjectRef>2-2001-111A4-01</subjectRef>
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   <species termID="birnOrgAnatomy_366">Homo sapiens</species>
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