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The Journal of Neuroscience, September 3, 2008, 28(36):8968-8972; doi:10.1523/JNEUROSCI.1513-08.2008

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Brief Communications
Eye Position Representation in Human Anterior Parietal Cortex

Daniela Balslev1,2 and R. Chris Miall1

1School of Psychology, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom, and 2Danish Research Centre for Magnetic Resonance, Copenhagen University Hospital, DK-2650 Hvidovre, Denmark

Correspondence should be addressed to Daniela Balslev, School of Psychology, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK. Email: d.balslev{at}bham.ac.uk

Eye position helps locate visual targets relative to one's own body and modulates the distribution of attention in visual space. Whereas in the monkey, proprioceptive eye position signals have been recorded in the somatosensory cortex, in humans, no brain site has yet been associated with eye position. We aimed to disrupt the proprioceptive representation of the right eye in the left somatosensory cortex, presumably located near the representation of the right hand, using repetitive transcranial magnetic stimulation (rTMS). Head-fixed subjects reported their perceived visual straight-ahead position using both left and right eye monocular vision, before and after 15 min of 1 Hz rTMS. rTMS over left somatosensory but not over left motor cortex shifted the perceived visual straight ahead to the left, whereas nonvisual detection of body midline was unchanged for either brain area. These results can be explained by the underestimation of the angle of gaze of the right eye when fixating the target. To link this effect more tightly to an altered ocular proprioception, we applied a passive deviation to the right eye before the visual straight-ahead task. Passive eye displacement modulated the shift in the perceived straight ahead induced by somatosensory rTMS, without affecting the perceived straight ahead at baseline or after motor cortex rTMS. We conclude that the anterior parietal cortex in humans encodes eye position and that this signal has a proprioceptive component.

Key words: eye; proprioception; visual; somatosensory; TMS; parietal cortex

Received April 8, 2008; revised July 2, 2008; accepted July 23, 2008.

Correspondence should be addressed to Daniela Balslev, School of Psychology, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK. Email: d.balslev{at}bham.ac.uk






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