Eye orientation during static tilts and its relationship to spontaneous head pitch in the laboratory mouse

Brain Research
Brian S Oommen, John S Stahl

Abstract

Both eye position and head orientation are influenced by the macular (otolith) organs, via the tilt maculo-ocular reflex (tiltMOR) and the vestibulo-collic reflexes, respectively. The mechanisms that control head position also influence the rest position of the eye because head orientation influences eye position through the tiltMOR. Despite the increasing popularity of mice for studies of vestibular and ocular motor functions, relatively little is known in this species about tiltMOR, spontaneous orientation of the head, and their interrelationship. We used 2D video oculography to determine in C57BL/6 mice the absolute horizontal and vertical positions of the eyes over body orientations spanning 360 degrees about the pitch and roll axes. We also determined head pitch during ambulation in the same animals. Eye elevation varied approximately sinusoidally as functions of pitch or roll angle. Over the central +/-30 degrees of pitch, sensitivity and gain in the light were 31.7 degrees/g and 0.53, respectively. The corresponding values for roll were 31.5 degrees/g and 0.52. Absolute positions adopted in light and darkness differed only slightly. During ambulation, mice carried the lambda-bregma plane at a downward pitch of 29 degrees...Continue Reading

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Citations

Dec 31, 2010·Experimental Brain Research·Americo A MigliaccioCharles C Della Santina
Aug 21, 2009·Journal of Neurophysiology·Sergei B YakushinTheodore Raphan
Aug 17, 2012·Journal of Neurophysiology·John S Stahl, Zachary C Thumser
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