Compensation of postural reactions to free-fall in the vestibular neurectomized monkey. Role of the visual motions cues

Experimental Brain Research
M Lacour, C Xerri

Abstract

In previous studies a contribution of vision to vestibular-dependent muscle responses during free-fall was found in the intact monkey, and the role of remaining labyrinthine afferents in compensation of these postural reactions was studied in vestibular neurectomized monkeys. In the present investigation we have compared the role of visual motion cues in the recovery of muscle responses to fall in unilateral (U.N.) and bilateral vestibular neurectomized (B.N.) baboons. During free-fall, electromyographic (EMG) responses were recorded from splenius capitis, soleus and tibialis anterior muscles. EMG activities were recorded in two randomly presented conditions: with normal motion of the visual world (NV) and with the visual world stabilized with respect to the baboon's head (SV) until 6 weeks after surgery. In B.N. baboons, results showed that condition SV was accompanied by a very strong motor depression during the entire test period. A greater decrease was observed in the splenius and soleus muscles. In U.N. baboons, significantly depressed EMG responses were recorded in the SV condition during the first two stages of compensation only (0--2 weeks), in all tested muscles except the tibialis anterior muscle. On the other hand, t...Continue Reading

Citations

Oct 20, 2004·Journal of the Association for Research in Otolaryngology : JARO·J David Dickman, Insook Lim
Mar 23, 2004·Behavioural Brain Research·Liliane BorelMichel Lacour
Jan 1, 1981·Annals of the New York Academy of Sciences·M LacourC Xerri
Dec 1, 1991·The Annals of Otology, Rhinology, and Laryngology·P M Gagey, M Toupet
Aug 1, 1986·The Laryngoscope·S B Peppard
Sep 21, 2011·Integrative and Comparative Biology·Ardian JusufiRobert Dudley

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