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The Journal of Neuroscience, March 29, 2006, 26(13):3615-3620; doi:10.1523/JNEUROSCI.3468-05.2006

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Behavioral/Systems/Cognitive
Movement Intention Is Better Predicted than Attention in the Posterior Parietal Cortex

Rodrigo Quian Quiroga,¹ Lawrence H. Snyder,² Aaron P. Batista,³ He Cui,¹ and Richard A. Andersen¹

¹Division of Biology, California Institute of Technology, Pasadena, California 91125, ²Department of Anatomy and Neurobiology, Washington University, St. Louis, Missouri 63130, and ³Department of Electrical Engineering, Stanford University, Stanford, California 94305

Correspondence should be addressed to Richard A. Andersen., Division of Biology, California Institute of Technology, MC 216-76, Pasadena, CA 91125. Email: andersen{at}vis.caltech.edu

We decoded on a trial-by-trial basis the location of visual targets, as a marker of the locus of attention, and intentions to reach and to saccade in different directions using the activity of neurons in the posterior parietal cortex of two monkeys. Predictions of target locations were significantly worse than predictions of movement plans for the same target locations. Moreover, neural signals in the parietal reach region (PRR) gave better predictions of reaches than saccades, whereas signals in the lateral intraparietal area (LIP) gave better predictions of saccades than reaches. Taking together the activity of both areas, the prediction of either movement in all directions became nearly perfect. These results cannot be explained in terms of an attention effect and support the idea of two segregated populations in the posterior parietal cortex, PRR and LIP, that are involved in different movement plans.

Key words: attention; motor intention; single-trial analysis; population coding; vision; parietal

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Received Aug. 16, 2005; revised Feb. 12, 2006; accepted Feb. 13, 2006.

Correspondence should be addressed to Richard A. Andersen., Division of Biology, California Institute of Technology, MC 216-76, Pasadena, CA 91125. Email: andersen{at}vis.caltech.edu

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