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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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Stimuli were presented in blocks lasting 23.2 s. Auditory stimuli were three-tone patterns varying in intensity (90 or 70 dB SPL), location (left ear, right ear or binaural) and frequency (center frequency = 225 Hz, 900 Hz, or 3600 Hz) in different blocks. Visual stimuli were pictures of faces or words. Subjects focused attention on the modality cued by the letter at fixation (e.g., “A” top) and performed difficult one-back matching task matching repeated tone patterns during auditory attention ( target = asterisk). Auditory and visual stimuli were presented with randomized asynchronous onsets to minimize multimodal integration. Attend-auditory (red) and attend-visual (blue) blocks occurred in constrained random order. UV = unimodal visual. UA = unimodal auditory. BV = bimodal, visual attention. BA = bimodal, auditory attention.