Abstract
Establishing the circuitry underlying attentional and oculomotor control is a long-standing goal of systems neuroscience. The macaque lateral intraparietal area (LIP) has been implicated in both processes, but numerous studies have produced contradictory findings. Anatomically, LIP consists of a dorsal and ventral subdivision, but the functional importance of this division remains unclear. We injected muscimol, a GABAA agonist, and manganese, a magnetic resonance imaging lucent paramagnetic ion, into different portions of LIP, examined the effects of the resulting reversible inactivation on saccade planning and attention, and visualized each injection using anatomical magnetic resonance imaging. We found that dorsal LIP (LIPd) is primarily involved in oculomotor planning, whereas ventral LIP (LIPv) contributes to both attentional and oculomotor processes. Additional testing revealed that the two functions were dissociable, even in LIPv. Using our technique, we found a clear structure-function relationship that distinguishes LIPv from LIPd and found dissociable circuits for attention and eye movements in the posterior parietal cortex.
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07 March 2010
In the version of this article initially published online, the scale bar in Figure 2a was not the correct size. A scale bar and several arrows were missing from Figure 6. The error has been corrected for the print, PDF and HTML versions of this article.
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Acknowledgements
We thank J. Baker and G. Patel for assistance in developing the manganese-MRI technique, and T. Malone, J. Tucker and J. Vytlacil for technical assistance. This work was supported by National Eye Institute grant EY012135 and National Science Foundation (Integrative Graduate Education and Research Traineeship) grant 0548890.
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Y.L. performed all aspects of this study, including the experimental design, data collection of two monkeys, analysis and writing of the manuscript. E.A.Y. assisted in data collection and analysis. L.H.S. oversaw the experiments and assisted in data analysis and manuscript preparation.
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Liu, Y., Yttri, E. & Snyder, L. Intention and attention: different functional roles for LIPd and LIPv. Nat Neurosci 13, 495–500 (2010). https://doi.org/10.1038/nn.2496
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DOI: https://doi.org/10.1038/nn.2496
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