Direction-dependent arm kinematics reveal optimal integration of gravity cues

Jeremie Gaveau, Bastien Berret, Dora E. Angelaki, Charalambos Papaxanthis

Research output: Contribution to journalArticlepeer-review


The brain has evolved an internal model of gravity to cope with life in the Earth’s gravitational environment. How this internal model benefits the implementation of skilled movement has remained unsolved. One prevailing theory has assumed that this internal model is used to compensate for gravity’s mechanical effects on the body, such as to maintain invariant motor trajectories. Alternatively, gravity force could be used purposely and efficiently for the planning and execution of voluntary movements, thereby resulting in direction-depending kinematics. Here we experimentally interrogate these two hypotheses by measuring arm kinematics while varying movement direction in normal and zero-G gravity conditions. By comparing experimental results with model predictions, we show that the brain uses the internal model to implement control policies that take advantage of gravity to minimize movement effort.

Original languageEnglish (US)
Article numbere16394
Issue numberNOVEMBER2016
StatePublished - Nov 2 2016

ASJC Scopus subject areas

  • General Neuroscience
  • General Biochemistry, Genetics and Molecular Biology
  • General Immunology and Microbiology


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