Decoding information for grasping from the macaque dorsomedial visual stream

Filippini, Matteo, Breveglieri, Rossella, Akhras, M. Ali, Bosco, Annalisa, Chinellato, Eris and Fattori, Patrizia (2017) Decoding information for grasping from the macaque dorsomedial visual stream. The Journal of Neuroscience, 37 (16). pp. 4311-4322. ISSN 0270-6474 (doi:10.1523/JNEUROSCI.3077-16.2017)

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Abstract

Neurodecoders have been developed by researchers mostly to control neuroprosthetic devices, but also to shed new light on neural functions. In this study, we show that signals representing grip configurations can be reliably decoded from neural data acquired from area V6A of the monkey medial posterior parietal cortex. Two Macaca fascicularis monkeys were trained to perform an instructed-delay reach-to-grasp task in the dark and in the light toward objects of different shapes. Population neural activity was extracted at various time intervals on vision of the objects, the delay before movement, and grasp execution. This activity was used to train and validate a Bayes classifier used for decoding objects and grip types. Recognition rates were well over chance level for all the epochs analyzed in this study. Furthermore, we detected slightly different decoding accuracies, depending on the task's visual condition. Generalization analysis was performed by training and testing the system during different time intervals. This analysis demonstrated that a change of code occurred during the course of the task. Our classifier was able to discriminate grasp types fairly well in advance with respect to grasping onset. This feature might be important when the timing is critical to send signals to external devices before the movement start. Our results suggest that the neural signals from the dorsomedial visual pathway can be a good substrate to feed neural prostheses for prehensile actions.

Item Type: Article
Research Areas: A. > School of Science and Technology
Item ID: 23828
Notes on copyright: Copyright © 2017 the authors. Copyright of all material published in JNeurosci remains with the authors. The authors grant the Society for Neuroscience an exclusive license to publish their work for the first 6 months. After 6 months the work becomes available to the public to copy, distribute, or display under a Creative Commons Attribution 4.0 International (CC BY 4.0) license.
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Depositing User: Eris Chinellato
Date Deposited: 08 Mar 2018 15:59
Last Modified: 02 Apr 2019 13:40
URI: https://eprints.mdx.ac.uk/id/eprint/23828

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