By V. B. Brooks (auth.), Prof. Dr. James R. Bloedel, Prof. Dr. Johannes Dichgans, Prof. Dr. Wolfgang Precht (eds.)
Over the prior few semesters a bunch of neurologists, neurophysiologists, and mind theorists in numerous departments of Tlibingen collage have accrued periodically with a view to evaluation rules and facts on cerebel lar features. from time to time, common recommendations appeared shut, whilst credits was once given to numerous theoretical proposals complex because the early days of cer ebellar body structure, despite the fact that, it grew to become transparent in each case that a huge a part of the on hand evidence refused to undergo the overall rules. As believers within the strength of medical dialogue, we felt that the time was once ripe for posing the matter of the cerebellum once again to a good articulated workforce of experts that might comprise proponents of each disparate viewpoint. The sponsorship of the Max Planck Society and of the Deutsche Forschungsgemeinschaft, to whom we exhibit our profound gratitude, made it attainable to arrange a world assembly in Septem ber, 1983. the purpose of constructing new, even extravagant principles palatable to one another was once good entire by way of the contributors. We belief that a few of the resulting pleasure has been carried over into the broadcast version.
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1. Calibrations: target - 12 deg; velocity - 200 deg/s; acceleration 4000 deg/s. Monkey Du. (Hore and Vilis 1984) presence of subsequent components. It is important to note that the perturbation, the initial movement trajectory, and thus the initial afferent drive is identical for both the expected and unexpected responses for the same pulse duration. The only factor that can account for the difference in the EMG responses in the monkey's different expectation of the forthcoming perturbation. When a step is expected preprogramming appears to direct activity to the agonist even though a pulse is actually received.
In: Towe AL, Luschei ES (eds) Motor coordination, Handbook of behavioral neurobiology, volS. Plenum Press, New York, pp 493-526 Georgopoulos AP, Kalaska JF, Massey JT (1981) Spatial trajectories and reaction times of aimed movements: effects of practice, uncertaintv. and change in target location. J Neurophysiol46: 725-743 Georgopoulos AP, Kalaska JF, Caminiti R, Massey JT (1982) On the relations between the direction of two-dimensional arm movements and cell discharge in primate motor cortex. J Neurosci 2: 1527-1537 Georgopoulos AP, Caminiti R, Kalaska JF, Massey JT (1983) Spatial coding of movement direction by motor cortical populations.
Scale = 200 ms. By applying extensor and flexor torque pulses to the wrist, 6 of 14 tremor-related interpositus neurons could be classified as excited by stretch of either the extensor or the flexor muscles. The tremor bursts of these interpositus neurons led the peaks in muscle stretch by an average of 51 deg (range 19-86). The interpositus tremor bursts therefore lagged the EMG bursts by an average of 12 s (range 4-22 ms) (before dropping into a pathological "cerebellar" range), but of sufficient amplitude to jeopardize performance during this demanding task.