Excitation of the extraocular muscles in decerebrate cats during the vestibulo-ocular reflex in three-dimensional space

J. F. Baker*, B. W. Peterson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

(1) Vestibulo-ocular reflex excitation of the six extraocular muscles was studied by recording their electromyographic activity in decerebrate cats during oscillations about horizontal and vertical axes, at frequencies from 0.07 to 4 Hz. Animals were oriented in many different positions and rotated about axes that lay in the horizontal, frontal, or sagittal planes defined by our coordinate system. (2) The strengths of modulation (gains) of the responses of all extraocular muscles were a sinusoidal function of the orientation of the rotation axis within a coordinate plane, and this function was nearly independent of rotation frequency. (3) The responses were used to determine an axis of maximal excitation for each of the extraocular muscles by the vestibulo-ocular reflex. Antagonistic muscle pairs were found to have best axes in nearly opposite directions, confirming their operation as pairs. (4) Excitation of the medial and lateral rectus could be explained by input from the paired horizontal semicircular canals, with essentially no convergent input from vertical canals. (5) Excitation of the vertical rectus and oblique muscles could be explained by convergent inputs from the vertical canals with little or no horizontal canal input.

Original languageEnglish (US)
Pages (from-to)266-278
Number of pages13
JournalExperimental Brain Research
Volume84
Issue number2
DOIs
StatePublished - Apr 1991

Keywords

  • Brain connection matrix
  • Cat
  • Extraocular muscles
  • Spatial responsiveness
  • Three dimensional vestibulo
  • ocular reflex

ASJC Scopus subject areas

  • Neuroscience(all)

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