Journal
JOURNAL OF NEUROSCIENCE
Volume 26, Issue 13, Pages 3615-3620Publisher
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.3468-05.2006
Keywords
attention; motor intention; single-trial analysis; population coding; vision; parietal
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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.
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