Reference frames for reaching when decoupling eye and target position in depth and direction

A. Bosco, R. Breveglieri, K. Hadjidimitrakis, C. Galletti, P. Fattori

Research output: Contribution to journalArticleResearchpeer-review

17 Citations (Scopus)

Abstract

Spatial representations in cortical areas involved in reaching movements were traditionally studied in a frontoparallel plane where the two-dimensional target location and the movement direction were the only variables to consider in neural computations. No studies so far have characterized the reference frames for reaching considering both depth and directional signals. Here we recorded from single neurons of the medial posterior parietal area V6A during a reaching task where fixation point and reaching targets were decoupled in direction and depth. We found a prevalent mixed encoding of target position, with eye-centered and spatiotopic representations differently balanced in the same neuron. Depth was stronger in defining the reference frame of eye-centered cells, while direction was stronger in defining that of spatiotopic cells. The predominant presence of various typologies of mixed encoding suggests that depth and direction signals are processed on the basis of flexible coordinate systems to ensure optimal motor response.
Original languageEnglish
Article number21646
Number of pages15
JournalScientific Reports
Volume6
DOIs
Publication statusPublished - 15 Feb 2016

Keywords

  • sensorimotor processing
  • somatosensory system

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