2009 Special Issue: Prediction of arm trajectory from the neural activities of the primary motor cortex with modular connectionist architecture

  • Authors:

  • Kyuwan Choi;Hideaki Hirose;Yoshio Sakurai;Toshio Iijima;Yasuharu Koike

  • Affiliations:

  • ATR Computational Neuroscience Laboratories, Japan and JST CREST, Japan;R&D Department, AISIN Cosmos R&D Co., Ltd., Japan and JST CREST, Japan;Graduate School of Letters, Kyoto University, Japan and JST CREST, Japan;Graduate School of Life Sciences, Tohoku University, Japan and JST CREST, Japan;Precision and Intelligence Laboratory, Tokyo Institute of Technology, Japan and JST CREST, Japan

  • Venue:
  • Neural Networks
  • Year:
  • 2009

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Abstract

In our previous study [Koike, Y., Hirose, H., Sakurai, Y., Iijima T., (2006). Prediction of arm trajectory from a small number of neuron activities in the primary motor cortex. Neuroscience Research, 55, 146-153], we succeeded in reconstructing muscle activities from the offline combination of single neuron activities recorded in a serial manner in the primary motor cortex of a monkey and in reconstructing the joint angles from the reconstructed muscle activities during a movement condition using an artificial neural network. However, the joint angles during a static condition were not reconstructed. The difficulties of reconstruction under both static and movement conditions mainly arise due to muscle properties such as the velocity-tension relationship and the length-tension relationship. In this study, in order to overcome the limitations due to these muscle properties, we divided an artificial neural network into two networks: one for movement control and the other for posture control. We also trained the gating network to switch between the two neural networks. As a result, the gating network switched the modules properly, and the accuracy of the estimated angles improved compared to the case of using only one artificial neural network.