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Temporal Analysis of Reference Frames in Parietal Cortex Area 5d during Reach Planning

Bremner, Lindsay R. and Andersen, Richard A. (2014) Temporal Analysis of Reference Frames in Parietal Cortex Area 5d during Reach Planning. Journal of Neuroscience, 34 (15). pp. 5273-5284. ISSN 0270-6474. PMCID PMC3983803. doi:10.1523/JNEUROSCI.2068-13.2014.

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The neural encoding of spatial and postural reference frames in posterior parietal cortex has traditionally been studied during fixed epochs, but the temporal evolution of these representations (or lack thereof) can provide insight into the underlying computations and functions of this region. Here we present single-unit data recorded from two rhesus macaques during a reach planning task. We found that area 5d coded the position of the hand relative to gaze before presentation of the reach target, but switched to coding the target location relative to hand position soon after target presentation. In the pretarget period the most relevant information for success in the task is the position of the hand relative to gaze; however, after target onset, the most task-relevant spatial relationship is the location of the target relative to the hand. The switch in coding suggests that population activity in area 5d may represent postural and spatial information in the reference frame that is most pertinent at each stage of the task. Moreover, although target−hand coding was dominant from soon after the reach target onset, this representation was not static but built in strength as movement onset approached, which we speculate could reflect a role for this region in building an accurate state estimate for the limb. We conclude that representations in area 5d are more flexible and dynamic than previously reported.

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Andersen, Richard A.0000-0002-7947-0472
Additional Information:© 2014 the authors. Received May 15, 2013; revised Feb. 26, 2014; accepted Feb. 28, 2014. This work was supported by National Institutes of Health Grant EY005522. We thank Tessa Yao for editorial assistance, Kelsie Pejsa and Viktor Shcherbatyuk for technical assistance, and Igor Kagan for magnetic resonance imaging. Author contributions: L.R.B. and R.A.A. designed research; L.R.B. performed research; L.R.B. analyzed data; L.R.B. and R.A.A. wrote the paper.
Funding AgencyGrant Number
Subject Keywords:monkey; neurophysiology; parietal; reaching; reference frames
Issue or Number:15
PubMed Central ID:PMC3983803
Record Number:CaltechAUTHORS:20140515-140959241
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45774
Deposited By: Tony Diaz
Deposited On:15 May 2014 21:20
Last Modified:10 Nov 2021 17:16

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