September 2015
Volume 15, Issue 12
Vision Sciences Society Annual Meeting Abstract  |   September 2015
Sensory-motor adaptation is (mostly) linear
Author Affiliations
  • Todd Hudson
    Psychology & Center for Neural Science, New York University
  • Jay Lee
    Phillips Exeter Academy
  • Michael Landy
    Psychology & Center for Neural Science, New York University
Journal of Vision September 2015, Vol.15, 184. doi:
  • Views
  • Share
  • Tools
    • Alerts
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      Todd Hudson, Jay Lee, Michael Landy; Sensory-motor adaptation is (mostly) linear. Journal of Vision 2015;15(12):184. doi:

      Download citation file:

      © ARVO (1962-2015); The Authors (2016-present)

  • Supplements

Sensory-motor adaptation is usually conceived as an automatic process that maintains the calibration between motor plans and movement outcomes. Viewed as a mechanism that monitors disturbances and produces compensatory motor outputs, sensory-motor adaptation can be thought of as a filter. The first question one normally asks regarding filter performance is whether it is linear. We test homogeneity and additivity using a sinusoidal sensory-motor perturbation of reach endpoints (Landy & Hudson, VSS 2012). Methods: Subjects made center-out reaches on a tabletop with fixed starting point, and with target direction and distance chosen to fall randomly within an annulus centered on the start position. Feedback was shown on a frontoparallel display. During each reach, only the target was shown. Fingertip endpoint was shown (shifted) on reach completion. The amount of shift was either a single or the sum of two sinewaves (over trials), with a peak shift of never more than 6 mm. Homogeneity was tested by measuring the response to sinewave-perturbed endpoints following a single sinusoidal disturbance with amplitude A and, in a separate session, 2A. As a test of additivity, the adaptive response to two sinewaves (A and B, of different frequencies) measured separately was compared to the response to perturbation using their sum. Results: The sensory-motor adaptive response to perturbations in (Cartesian) x- and y-dimensions are consistent with linearity, in that the response to A and B sinusoidal perturbations measured in isolation predict the adaptive response to the 2A and the A+B perturbations. By the same criteria, the polar gain dimension also displays linearity. However, the polar angle dimensions displays a small but statistically significant deviation from linearity in its phase response in the additivity condition: its response to the A+B perturbation lags differently than predicted by its response to the A and B perturbations applied separately.

Meeting abstract presented at VSS 2015


This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.