Brain oscillations evoked during spatial selective attention and their neural correlates: an EEG study
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1
Eemagine Medical Imaging Solutions, Germany
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2
ANT B.V. Advanced NeuroTechnology, Netherlands
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3
Technische Universität Ilmenau, Germany
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4
University of California, United States
We investigated evoked brain oscillations associated with the P1 and N1 attention effects observed during visual spatial attention paradigms. We also estimated the neural generators of those attention-dependent oscillations. We presented checkerboards either to the left or to the right visual hemifield while subjects (n=12) fixated their gaze on a centered arrow (Fig 1). This arrow indicated to which hemifield subjects had to direct their attention. The task consisted in identifiying a slight luminance change in the white checks of the attended checkerboard that appearead in 20 % of the trials. After demonstrating that the paradigm produced the prototypical P1 and N1 amplitude increases in response to attended versus unattended standard stimuli (Fig 1), we performed spectral analysis using Morlet wavelets and determined which oscillations presented statistically significant power changes when attended and unattended conditions were compared. The neural generators of those oscillations were determined using the source reconstruction technique swLORETA in the frequency domain. This technique allows us to map the parametric increase in a given frequency to the brain anatomy while preserving both the frequency and the time domain information. Our results revealed that during P1 and N1 latency windows theta (3-7Hz) oscillations significantly increased in power in the attended conditions for electrodes contralateral to the presentation hemifield (Fig 1). Beta (18-28Hz) also tended to be higher during the P1 latency window, especially on the contralateral electrodes but the comparison only reached statiscal significance for left hemifield stimulation. The neural generators of both theta and beta oscillations during the P1 attention effect were localized in the contralateral middle occipital gyrus, next to BA 19 (Fig 2 left presents these results for theleft hemifield stimulation ). The generators of theta oscillations during the N1 attention effect were similarly localized in the contralateral middle occipital gyrus, and in the occipitotemporal gyrus of the right hemisphere irrespective of the presentation hemifield (Fig 2 right). These results suggest that directing attention to a particular spatial location produces an enhancement of theta, and to some extent beta oscillations, which may underlie the observed ERP spatial attention effects.
Conference:
10th International Conference on Cognitive Neuroscience, Bodrum, Türkiye, 1 Sep - 5 Sep, 2008.
Presentation Type:
Poster Presentation
Topic:
Attention
Citation:
Alanso-Prieto
E,
Palmero-Soler
E,
Zanow
F,
Haueisen
J and
Martinez
A
(2008). Brain oscillations evoked during spatial selective attention and their neural correlates: an EEG study.
Conference Abstract:
10th International Conference on Cognitive Neuroscience.
doi: 10.3389/conf.neuro.09.2009.01.094
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Received:
02 Dec 2008;
Published Online:
02 Dec 2008.
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Correspondence:
Esther Alanso-Prieto, Eemagine Medical Imaging Solutions, 82152 Planegg-Martinsried, Germany, esther.alonso@eemagine.com