Avtor/Urednik		Prevec, Tine S; Berič, Aleksandar
Naslov		Latency of somatosensory evoked potentials and temporal summation in the medial lemniscus
Tip		članek
Vir		In: Hashimoto I, Kakigi R, editors. Recent advances in human neurophysiology. Proceedings of the 6th international evoked potentials symposium; 1998 Mar 21-25; Okazaki, Japan. Amsterdam: Elsevier science,
Leto izdaje		1998
Obseg		str. 98-103
Jezik		eng
Abstrakt		Exactly controlled displacement and time course of the displacement of the stimulating surface makes it possible to use well standardised submaximal natural mechanical stimuli of different intenstities to evoke somatosensory cerebral potentials (SEP). The SEP latency to mechanical stimulation of the thumb ball by 800-micro m displacement is longer and has smaller amplitude than to electrical stimulation. Smaller displacement (500, 250, 125, 50 and 25 micro m) produce even longer latencies and smaller amplitudes of all SsCEP peaks. It is our understanding that the mechanisms of the synpatic transmission of the nucleus cuneatus and of the ventro-basal complex of thalamus modify the long-lasting afferent discharge of the peripheral nerve produced by mechanical stimuli resulting in such a synchronisation of the cortical activity that the SEP similar to the electrical one can be recorded. It seems that the summation time of the medial lemniscus system does not depend on the duration of the afferent discharge, but on the intensity of the discharge. The larger the central excitation, the shorter the summation time is. This results in a better central synchronisation of the long-lasting afferent discharge produced by a mechanical stimulus.
Deskriptorji		EVOKED POTENTIALS, SOMATOSENSORY MEDIAN NERVE THUMB ELECTRIC STIMULATION PHYSICAL STIMULATION ADULT SYNAPTIC TRANSMISSION NEURAL CONDUCTION CEREBRAL CORTEX