This work was supported by NIMH grant R01 MH066034 to JBH.
Isolating the internal in endogenous attention
Article first published online: 8 FEB 2010
Copyright © 2010 Society for Psychophysiological Research
Volume 47, Issue 4, pages 739–747, July 2010
How to Cite
Hopfinger, J. B., Camblin, C. C. and Parks, E. L. (2010), Isolating the internal in endogenous attention. Psychophysiology, 47: 739–747. doi: 10.1111/j.1469-8986.2010.00981.x
- Issue published online: 9 JUN 2010
- Article first published online: 8 FEB 2010
- (Received March 6, 2009; Accepted August 19, 2009)
Neuroimaging studies have provided evidence that a bilateral frontal-parietal network is involved in voluntary attentional control. However, because those studies used instructive cue stimuli, some of the activity may have been due to interactions between cue processing and voluntary orienting. Here, we show that self-initiated voluntary orienting, in the absence of any cue stimulus, evokes activity in this frontal-parietal network. In contrast to the typical symmetric activity observed with cued attentional shifts, self-initiated shifts showed a hemispheric asymmetry consistent with studies of unilateral neglect patients. Specifically, the right hemisphere was equally involved in orienting to either visual field, whereas the left hemisphere was biased toward the contralateral field. Our data show that the asymmetry of attentional control can be revealed in neuroimaging of healthy subjects, when voluntary orienting is effectively isolated.