Adaptive control of saccades via internal feedback

Haiyin Chen-Harris, Wilsaan Joiner, Vincent Ethier, David S. Zee, Reza Shadmehr

Research output: Contribution to journalArticle

147 Citations (Scopus)

Abstract

Ballistic movements like saccades require the brain to generate motor commands without the benefit of sensory feedback. Despite this, saccades are remarkably accurate. Theory suggests that this accuracy arises because the brain relies on an internal forward model that monitors the motor commands, predicts their sensory consequences, and corrects eye trajectory midflight. If control of saccades relies on a forward model, then the forward model should adapt whenever its predictions fail to match sensory feedback at the end of the movement. Using optimal feedback control theory, we predicted how this adaptation should alter saccade trajectories. We trained subjects on a paradigm in which the horizontal target jumped vertically during the saccade. With training, the final position of the saccade moved toward the second target. However, saccades became increasingly curved, i.e., suboptimal, as oculomotor commands were corrected on-line to steer the eye toward the second target. The adaptive response had two components: (1) the motor commands that initiated the saccades changed slowly, aiming the saccade closer to the jumped target. The adaptation of these earliest motor commands displayed little forgetting during the rest periods. (2) Late in saccade trajectory, another adaptive response steered it still closer to the jumped target, producing curvature. Adaptation of these late motor commands showed near-complete forgetting during the rest periods. The two components adapted at different timescales, with the late-acting component displaying much faster rates. It appears that in controlling saccades, the brain relies on an internal feedback that has the characteristics of a fast-adapting forward model.

Original languageEnglish (US)
Pages (from-to)2804-2813
Number of pages10
JournalJournal of Neuroscience
Volume28
Issue number11
DOIs
StatePublished - Mar 12 2008
Externally publishedYes

Fingerprint

Saccades
Sensory Feedback
Brain

Keywords

  • Curved saccades
  • Fatigue
  • Forward model
  • Internal feedback
  • Optimal control
  • Saccade adaptation

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Adaptive control of saccades via internal feedback. / Chen-Harris, Haiyin; Joiner, Wilsaan; Ethier, Vincent; Zee, David S.; Shadmehr, Reza.

In: Journal of Neuroscience, Vol. 28, No. 11, 12.03.2008, p. 2804-2813.

Research output: Contribution to journalArticle

Chen-Harris, H, Joiner, W, Ethier, V, Zee, DS & Shadmehr, R 2008, 'Adaptive control of saccades via internal feedback', Journal of Neuroscience, vol. 28, no. 11, pp. 2804-2813. https://doi.org/10.1523/JNEUROSCI.5300-07.2008
Chen-Harris, Haiyin ; Joiner, Wilsaan ; Ethier, Vincent ; Zee, David S. ; Shadmehr, Reza. / Adaptive control of saccades via internal feedback. In: Journal of Neuroscience. 2008 ; Vol. 28, No. 11. pp. 2804-2813.
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