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J Neurophysiol 94: 764-774, 2005. First published March 2, 2005; doi:10.1152/jn.01052.2004
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Frontoparietal Control of Spatial Attention and Motor Intention in Human EEG

Peter Praamstra1,2, Luc Boutsen1 and Glyn W. Humphreys1

1Behavioural Brain Sciences Centre and 2Department of Clinical Neurology, Queen Elizabeth Hospital, University of Birmingham, Birmingham, United Kingdom

Submitted 6 October 2004; accepted in final form 22 February 2005

Relations between spatial attention and motor intention were investigated by means of an EEG potential elicited by shifting attention to a location in space as well as by the selection of a hand for responding. High-density recordings traced this potential to a common frontoparietal network activated by attentional orienting and by response selection. Within this network, parietal and frontal cortex were activated sequentially, followed by an anterior-to-posterior migration of activity culminating in the lateral occipital cortex. Based on temporal and polarity information provided by EEG, we hypothesize that the frontoparietal activation, evoked by directional information, updates a task-defined preparatory state by deselecting or inhibiting the behavioral option competing with the cued response side or the cued direction of attention. These results from human EEG demonstrate a direct EEG manifestation of the frontoparietal attention network previously identified in functional imaging. EEG reveals the time-course of activation within this network and elucidates the generation and function of associated directing-attention EEG potentials. The results emphasize transient activation and a decision-related function of the frontoparietal attention network, contrasting with the sustained preparatory activation that is commonly inferred from neuroimaging.

Address for reprint requests and other correspondence: P. Praamstra, Behavioural Brain Sciences Ctr., School of Psychology, Univ. of Birmingham, Birmingham B15 2TT, UK (E-mail: p.praamstra{at}bham.ac.uk)




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