Differential coding of head rotation by lateral-vertical canal convergent central vestibular neurons

Progress in Brain Research
Julia N EronSergei B Yakushin

Abstract

Convergent inputs from the lateral and vertical semicircular canals (LC and VC) to 31 central vestibular-only (VO) and vestibular-plus-saccade (VPS) neurons were determined by oscillating monkeys about a spatial vertical axis while the head was tilted forward and backward up to 90 degrees. Activity of each neuron varied as a function of head tilt. Seven neurons had maximal activation when the head was tilted approximately 30 degrees forward (spatial phase), indicating convergent inputs from the LC, while peak activation of 10 units occurred with the head tilted back approximately 50 degrees, indicating VC input. Fourteen neurons had spatial phases that deviated more that 15 degrees from the LC and VC planes, indicating convergent inputs from LC and VC. Seven of these neurons had a spatial phase less than 15 degrees forward and 35 degrees back, indicating canal inputs from both sides. Seven other neurons had spatial phases more that 45 degrees forward and 65 degrees back, indicating inputs from canals located on the same side. Thus, there are two groups of central vestibular neurons: one group responds maximally when the head is rotated about a spatial vertical axis in an upright position, declining as the head is tilted away fr...Continue Reading

Citations

Sep 5, 2018·Physiological Reports·Julia N EronSergei B Yakushin
Sep 2, 2017·Frontiers in Neurology·Sergei B YakushinBernard Cohen

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