title: [Frequency analysis of motor reactions induced by stimulation of the motor cortex in unanaesthetized cats].
abstract: Frequency properties of muscle contraction evoked by macrostimulation of motor cortex were studied in chronic cats. Frequency- and amplitude-modulated stimulation pulse trains were used, alternating component of the induced muscle contraction was considered as output signal. Analysis of signal transformations in the system under study was performed with application of the method of harmonical linearization. Phase lag of the output signal was minimal at 0.2 Hz and ranged from 40 degrees to 90 degrees in various experiments. Phase lag and amplitude decrement were substantially increased at frequencies above 1-2 Hz. The mean value of the phase lag at a frequency of 5 Hz was about 180 degrees, the mean slope of amplitude characteristics in a 2-10 Hz range was equal to -12 dB/decade. It is supposed that certain correction of dynamic properties of the studied system could result from adaptation properties of neuronal firing.
mesh_terms: D000222:Adaptation, Physiological; D000818:Animals; D001696:Biomechanical Phenomena; D001931:Brain Mapping; D002415:Cats; D004525:Efferent Pathways / Q000502:physiology; D004558:Electric Stimulation; D009044:Motor Cortex / Q000502:physiology*; D009119:Muscle Contraction
vernacular_title: Chastotnyĭ analiz dvigatel'nykh reaktsiĭ, vyzyvaemykh u nenarkotizirovannykh koshek stimuliatsieĭ motornoĭ kory.