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. 2009 Apr 13;4(4):e5183. doi: 10.1371/journal.pone.0005183

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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Plots show regions with significant activations coded by the frequency that produced maximal activation at that point. Red = 3600 Hz, Green = 900 Hz, Blue = 225 Hz. Averaged over subjects, continuous and sparse sampling, sound spatial position, and sound intensity. Activation maps are shown on the average gyral structure (white lines) of the left and right hemispheres. z-score threshold = 4.0. H1 and H2 identify posterior and anterior foci driven by high-frequency tones whereas L1 shows a central region driven by low-frequency tones.