Vestibular control of the head: Possible functions of the vestibulocollic reflex

Jay M. Goldberg, Kathleen Cullen

Research output: Contribution to journalArticle

Abstract

Here, we review the angular vestibulocollic reflex (VCR) focusing on its function during unexpected and voluntary head movements. Theoretically, the VCR could (1) stabilize the head in space during body movements and/or (2) dampen head oscillations that could occur as a result of the head's underdamped mechanics. The reflex appears unaffected when the simplest, trisynaptic VCR pathways are severed. The VCR's efficacy varies across species; in humans and monkeys, head stabilization is ineffective during low-frequency body movements in the yaw plan. While the appearance of head oscillations after the attenuation of semicircular canal function suggests a role in damping, this interpretation is complicated by defects in the vestibular input to other descending motor pathways such as gaze premotor circuits. Since the VCR should oppose head movements, it has been proposed that the reflex is suppressed during voluntary head motion. Consistent with this idea, vestibular-only (VO) neurons, which are possible vestibulocollic neurons, respond vigorously to passive, but not active, head rotations. Although VO neurons project to the spinal cord, their contribution to the VCR remains to be established. VCR cancelation during active head movements could be accomplished by an efference copy signal negating afferent activity related to active motion. Oscillations occurring during active motion could be eliminated by some combination of reflex actions and voluntary motor commands that take into account the head's biomechanics. A direct demonstration of the status of the VCR during active head movements is required to clarify the function of the reflex.

Original languageEnglish (US)
Pages (from-to)331-345
Number of pages15
JournalExperimental Brain Research
Volume210
Issue number3-4
DOIs
StatePublished - May 2011
Externally publishedYes

Fingerprint

Reflex
Head
Head Movements
Neurons
Yaws
Efferent Pathways
Semicircular Canals
Mechanics
Biomechanical Phenomena
Haplorhini
Spinal Cord

Keywords

  • Control systems
  • Damping
  • Efference copy
  • Head stabilization
  • Vestibulocollic reflex

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Vestibular control of the head : Possible functions of the vestibulocollic reflex. / Goldberg, Jay M.; Cullen, Kathleen.

In: Experimental Brain Research, Vol. 210, No. 3-4, 05.2011, p. 331-345.

Research output: Contribution to journalArticle

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