By Wolfgang Precht (auth.)
The unique motive of the sequence reviews of mind functionality was once to provide a discussion board to neurobiologists operating in numerous fields to offer a few of their fresh ends up in a extra vast means. What can have been or will be released in numerous papers showing in several journals will therefore be com bined in a single monograph, hence making the knowledge extra simply to be had to a much broader medical group. it's also believed that such an test will supply a extra finished perception into one specific box of neurobiol ogy. Admittedly, the monograph will characterize a extra subjective view than that supplied through a classical evaluate article. during this monograph i will describe an important point of my study, i.e., the imperative processing of data bobbing up from the receptors within the semicircular canals and otoliths of the internal ear. I shall limit this report back to these platforms which are keen on the vestibuloocular transmission, for the reason that they provide specific chance to review sensory-motor integration.
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Additional info for Neuronal Operations in the Vestibular System
Lobyrmth opened 050 IF E -y-'-'-'-' + 10 10 sec 10 10 30 TIME (sec) 50 Fig. 19 A -F. Responses of lagena afferents to constant velocity changes in head position. (A, C, E) instantaneous frequency plots of a tonic (A), phasic-tonic (B) and phasic unit (E) to constant velocity roll (± 20°). 6° /sec)in roll; ordinate: normalized gain; abscissa: time in seconds. The line below (F) gives head position and applies also for (B) and (D). 7% showed phase-lag (see Fig. 20A). 6% phase-lag) was found when the labyrinthine cavity was opened (Fig.
J a.. J (j') = a.. ~ ~ C + 12 40 30 20 10 '. :..... , ...... -', . :. ':.. :,- . ---r----r----,--,---,-, + -17 ~ 10 / l:-:':'-,m>,'-:':'-,':-,--"",i'::": 10 20 30 40 50 60 70 80 90 TIME (sec) Fig. 16 A-D. Responses of afferent otolithic and canal neurons to constant velocity changes in head position. Typical responses of a tonic (A), phasic-tonic (B), phasic (C) otolithic neuron, and a posterior canal neuron (D) to constant velocity head rotation in roll. The stimulus in (A-D) is head position in roll in degrees; ipsilateral ear down is positive (+), contralateral ear down is negative (-).
These neurons belonged to the three otolithic organs (sacculus, utriculus, lagena) and were recorded in both anterior and posterior branches of the nerve. Vibration did not af- Primary Vestibular Neurons 30 fect the units analyzed here. However, other units in the VIIIth nerve could show very sensitive vibration responses. , 1975). The behavior of each group can be seen in Figure 16 A -C. In Figure 16A, the discharge rate of a tonic otolithic neuron was modulated as a function of head position (gravity); remarkably nonadapting upon arriving at a new head position and relatively independent of the speed with which a new head position was achieved (no dynamics).
Neuronal Operations in the Vestibular System by Wolfgang Precht (auth.)