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Lateralization of Frequency-Specific Networks for Covert Spatial Attention to Auditory Stimuli

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Abstract

We conducted a cued spatial attention experiment to investigate the time–frequency structure of human EEG induced by attentional orientation of an observer in external auditory space. Seven subjects participated in a task in which attention was cued to one of two spatial locations at left and right. Subjects were instructed to report the speech stimulus at the cued location and to ignore a simultaneous speech stream originating from the uncued location. EEG was recorded from the onset of the directional cue through the offset of the inter-stimulus interval (ISI), during which attention was directed toward the cued location. Using a wavelet spectrum, each frequency band was then normalized by the mean level of power observed in the early part of the cue interval to obtain a measure of induced power related to the deployment of attention. Topographies of band specific induced power during the cue and inter-stimulus intervals showed peaks over symmetric bilateral scalp areas. We used a bootstrap analysis of a lateralization measure defined for symmetric groups of channels in each band to identify specific lateralization events throughout the ISI. Our results suggest that the deployment and maintenance of spatially oriented attention throughout a period of 1,100 ms is marked by distinct episodes of reliable hemispheric lateralization ipsilateral to the direction in which attention is oriented. An early theta lateralization was evident over posterior parietal electrodes and was sustained throughout the ISI. In the alpha and mu bands punctuated episodes of parietal power lateralization were observed roughly 500 ms after attentional deployment, consistent with previous studies of visual attention. In the beta band these episodes show similar patterns of lateralization over frontal motor areas. These results indicate that spatial attention involves similar mechanisms in the auditory and visual modalities.

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Acknowledgments

We thank Tom Lappas, Siyi Deng, Cort Horton, and Bill Winter for their contributions to this work. This work was supported by ARO 54228-LS-MUR, and R01-MH68004.

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  1. UCI Department of Cognitive Sciences, Institute for Mathematical Behavioral Sciences, University of California, Irvine, SSPA 3151, Irvine, CA, 92697-5100, USA

    Samuel Thorpe, Michael D’Zmura & Ramesh Srinivasan

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  1. Samuel Thorpe
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Correspondence to Ramesh Srinivasan.

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Thorpe, S., D’Zmura, M. & Srinivasan, R. Lateralization of Frequency-Specific Networks for Covert Spatial Attention to Auditory Stimuli. Brain Topogr 25, 39–54 (2012). https://doi.org/10.1007/s10548-011-0186-x

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