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Experimental Brain Research

, Volume 143, Issue 3, pp 350–358 | Cite as

The perception of body orientation after neck-proprioceptive stimulation

Effects of time and of visual cueing
  • H. -O. KarnathEmail author
  • E. Reich
  • C. Rorden
  • M. Fetter
  • J. Driver
Research Article

Abstract

Different sensory systems (e.g. proprioception and vision) have a combined influence on the perception of body orientation, but the timescale over which they can be integrated remains unknown. Here we examined how visual information and neck proprioception interact in perception of the “subjective straight ahead” (SSA), as a function of time since initial stimulation. In complete darkness, healthy subjects directed a laser spot to the point felt subjectively to be exactly straight ahead of the trunk. As previously observed, left neck muscle vibration led to a disparity between subjective perception and objective position of the body midline, with SSA misplaced to the left. We found that this displacement was sustained throughout 28 min of continuous proprioceptive stimulation, provided there was no visual input. Moreover, prolonged vibration of neck muscles leads to a continuing disparity between subjective and objective body orientation even after offset of the vibration; the longer the preceding vibration, the more persistent the illusory deviation of body orientation. To examine the role of vision, one group of subjects fixated a central visual target at the start of each block of continuous neck vibration, with SSA then measured at successive intervals in darkness. The illusory deviation of SSA was eliminated whenever visual input was provided, but returned as a linear function of time when visual information was eliminated. These results reveal: the persistent effects of neck proprioception on the SSA, both during and after vibration; the influence of vision; and integration between incoming proprioceptive information and working memory traces of visual information.

Keywords

Straight-ahead perception Visual memory Neck muscle vibration Human 

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Copyright information

© Springer-Verlag 2002

Authors and Affiliations

  • H. -O. Karnath
    • 1
    Email author
  • E. Reich
    • 1
  • C. Rorden
    • 2
  • M. Fetter
    • 1
  • J. Driver
    • 3
  1. 1.Departments of Cognitive and General NeurologyUniversity of TübingenTübingenGermany
  2. 2.School of PsychologyUniversity of NottinghamNottinghamUK
  3. 3.Institute of Cognitive NeuroscienceUniversity College LondonLondonUK

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