Neuronal coding of linear motion in the vestibular nuclei of the alert cat. III. Dynamic characteristics of visual-otolith interactions

Experimental Brain Research
C XerriM Lacour

Abstract

In the present study we have investigated in the awake cat the response dynamics of vestibular nuclei neurons to visual or/and otolith stimulation elicited by vertical linear motion. Of the 53 units tested during sinusoidal motion at 0.05 Hz (9.1 cm/s), 1 (1.9%) was responsive to the otolith input only, 13 (24.5%) were influenced by the visual input only and 23 (43.4%) responded to both modalities. Neurons were excited either during upward or downward animal or visual surround movement. Most units displayed a firing rate modulation very close to motion velocity. All the neurons receiving convergent visual and otolith inputs (0.05 Hz, 9.1 cm/s) exhibited synergistic patterns of response. Motion velocity coding was improved in terms of input-output phase relationship and response sensitivity when visual and otolith signals were combined. Depending on the units, visual-otolith interactions in single neurons could follow a linear or a nonlinear mode of summation. The dynamic characteristics of visual-otolith interactions were examined in the 0.05 Hz-0.50 Hz frequency bandwidth. Visual signals seemed to predominate over otolith signals at low stimulus frequencies (up to 0.25 Hz), while the contrary was found in the higher frequency ...Continue Reading

Citations

Jan 1, 1991·Acta Oto-laryngologica. Supplementum·S S MossmanJ D Hood
Jun 18, 1999·Annals of the New York Academy of Sciences·T LempertA M Bronstein
Jan 11, 2002·Journal of Neurophysiology·M Rohregger, N Dieringer
Jan 1, 1990·European Journal of Applied Physiology and Occupational Physiology·H SeidelP Ullsperger
Nov 26, 2008·Neurophysiologie clinique = Clinical neurophysiology·L BorelM Lacour

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