Off-centric rotation axes in natural head movements: implications for vestibular reafference and kinematic redundancy

Journal of Neurophysiology
W P MedendorpJ A Gisbergen

Abstract

Until now, most studies concerning active head movements in three dimensions have used the classical rotation vector description. Although this description yields both the orientation of the head rotation axis and the amount of rotation, it is incomplete because it cannot specify the location of this rotation axis in space. The latter is of importance for a proper picture of the vestibular consequences of active head movements and has relevance for the problem of how the brain deals with the inherent kinematic redundancy of the multijoint head-neck system. With this in mind, we have extended the rotation vector description by applying the helical axes approach, which yields both the classical rotation vector as well as the location of the rotation axis in space. Subjects (n = 7), whose head movements were recorded optically, were instructed to shift gaze naturally to targets in 12 different directions at an eccentricity of 40 degrees. The results demonstrate that the axes for these head movements occupy consistently different spatial locations. For purely horizontal movements, the rotation axis is located near a point midway between the two ear canals. For gaze shifts in other directions, the rotation axes are located below the...Continue Reading

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Citations

May 17, 2006·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Shay OhayonEhud Rivlin
Jan 1, 2014·Traffic Injury Prevention·F J Lopez-ValdesR Kent
Nov 9, 2000·Journal of Neurophysiology·W P MedendorpC C Gielen
May 13, 2003·Journal of Neurophysiology·Eliana M KlierJ Douglas Crawford
Dec 9, 2000·Journal of Neurophysiology·W P MedendorpC C Gielen
Jan 11, 2002·Journal of Neurophysiology·W P MedendorpC C A M Gielen
Nov 24, 1999·Journal of Neurophysiology·W P MedendorpC C Gielen
Sep 28, 2007·Journal of Neurophysiology·Mikhail KuninTheodore Raphan
Mar 4, 2003·Journal of Neurophysiology·Julio C Martinez-TrujilloJ Douglas Crawford
Jun 18, 1999·Annals of the New York Academy of Sciences·W P MedendorpC C Gielen
Jan 19, 2007·Journal of Neurophysiology·Farshad FarshadmaneshJ Douglas Crawford
Sep 5, 2002·Vision Research·Agnes M F WongDouglas Tweed

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