Recovery cycles of mass evoked potentials of different levels of the visual system following electrical stimulation of the optic nerve

1971 ◽  
Vol 2 (3) ◽  
pp. 189-195
Author(s):  
I. A. Shevelev ◽  
I. P. Levshina
Keyword(s):  
Electrical Stimulation ◽  
Optic Nerve ◽  
Visual System ◽  
Evoked Potentials ◽  
Recovery Cycles ◽  
Different Levels ◽  
Stimulation Of

Measurement of Evoked Potentials after Electrical Stimulation of the Human Optic Nerve

2010 ◽  
Vol 51 (10) ◽  
pp. 5351 ◽  
Author(s):  
Marten E. Brelén ◽  
Valerie Vince ◽  
Benoit Gérard ◽  
Claude Veraart ◽  
Jean Delbeke
Keyword(s):  
Electrical Stimulation ◽  
Optic Nerve ◽  
Evoked Potentials ◽  
Human Optic Nerve ◽  
Stimulation Of

scholarly journals Sensory and motor electrophysiological mapping of the cerebellum in humans

2020 ◽  
Author(s):  
Reiko Ashida ◽  
Peter Walsh ◽  
Jonathan C.W. Brooks ◽  
Richard J. Edwards ◽  
Nadia L. Cerminara ◽  
...  
Keyword(s):  
Electrical Stimulation ◽  
Evoked Potentials ◽  
Posterior Fossa ◽  
Posterior Lobe ◽  
Posterior Fossa Surgery ◽  
Motor Mapping ◽  
Human Cerebellum ◽  
Limb Muscles ◽  
The Right ◽  
Stimulation Of

AbstractDamage to the cerebellum during posterior fossa surgery can lead to ataxia and in paediatric cases, the risk of cerebellar mutism syndrome. Animal electrophysiological and human imaging studies have shown compartmentalisation of sensorimotor and cognitive functions within the cerebellum. In the present study, electrophysiological monitoring of sensory and motor pathways was carried out to assess the location of limb sensorimotor representation within the human cerebellum, as a potential approach for real time assessment of neurophysiological integrity to reduce the incidence of cerebellar surgical morbidities.Thirteen adult and paediatric patients undergoing posterior fossa surgery were recruited. For sensory mapping (n=8), electrical stimulation was applied to the median nerves, the posterior tibial nerves, or proximal and distal limb muscles and evoked field potential responses were sought on the cerebellar surface. For motor mapping (n=5), electrical stimulation was applied to the surface of the cerebellum and evoked EMG responses were sought in facial and limb muscles.Evoked potentials on the cerebellar surface were found in two patients (25% of cases). In one patient, the evoked response was located on the surface of the right inferior posterior cerebellum in response to stimulation of the right leg. In the second patient, stimulation of the extensor digitorum muscle in the left forearm evoked a response on the surface of the left inferior posterior lobe. In the motor mapping cases no evoked EMG responses could be found.Intraoperative electrophysiological mapping, therefore, indicates it is possible to record evoked potentials on the surface of the human cerebellum in response to peripheral stimulation.

Relation of Posttetanic Potentiation to Subnormality of Lateral Geniculate Potentials

1957 ◽  
Vol 188 (2) ◽  
pp. 238-244 ◽  
Author(s):  
Edward V. Evarts ◽  
John R. Hughes
Keyword(s):  
Electrical Stimulation ◽  
Optic Nerve ◽  
Posttetanic Potentiation ◽  
Postsynaptic Response ◽  
Lateral Geniculate ◽  
Decerebrate Cats ◽  
Stimulation Of

The lateral geniculate response to electrical stimulation of the optic nerve was recorded in decerebrate cats and in cats anesthetized with Nembutal. Tetanization of the optic nerve at 500/sec. for 20 seconds in nembutalized cats produced a prolonged second subnormality of the geniculate postsynaptic response. Further tetanization during tetanically-induced second subnormality produced posttetanic potentiation (PTP). The degree of PTP (expressed in percentage of the pretetanic level) of the postsynaptic response following a 20-second tetanus was proportional to the degree of second subnormality present at the time the tetanus was applied. PTP was also found to occur during the subnormality which followed a brief train of optic nerve shocks, and during LSD-induced subnormality. PTP of postsynaptic lateral geniculate potentials occurred only rarely in the absence of some form of intentionally induced subnormality.

Electrical Stimulation of the Cerebral Visual System in Man

1974 ◽  
Vol 36 (2) ◽  
pp. 113-124 ◽  
Author(s):  
S. Uematsu ◽  
N. Chapanis ◽  
G. Gucer ◽  
B. Konigsmark ◽  
A.E. Walker
Keyword(s):  
Electrical Stimulation ◽  
Visual System ◽  
Stimulation Of

Evoked potentials elicited on the cerebellar cortex by electrical stimulation of the rat spinocerebellar tract

2009 ◽  
Vol 72 (4) ◽  
pp. 395-400 ◽  
Author(s):  
Hiroyuki Muramatsu ◽  
Kyouichi Suzuki ◽  
Tatsuya Sasaki ◽  
Masato Matsumoto ◽  
Jun Sakuma ◽  
...  
Keyword(s):  
Electrical Stimulation ◽  
Evoked Potentials ◽  
Cerebellar Cortex ◽  
Spinocerebellar Tract ◽  
Stimulation Of

Efferent-mediated protection from acoustic overexposure: relation to slow effects of olivocochlear stimulation

1995 ◽  
Vol 73 (2) ◽  
pp. 506-514 ◽  
Author(s):  
E. R. Reiter ◽  
M. C. Liberman
Keyword(s):  
Electrical Stimulation ◽  
Inner Ear ◽  
Guinea Pigs ◽  
Threshold Shift ◽  
Exposure Condition ◽  
Protective Effects ◽  
Acoustic Overstimulation ◽  
Different Levels ◽  
Stimulation Of

1. The present study attempts to resolve discrepancies in the reported role of olivocochlear (OC) efferent activation in protecting the inner ear from acoustic overstimulation: in previous studies, activating the OC system in guinea pigs reduced the threshold shift caused by 1 min monaural exposure to a 10-kHz tone; whereas unilateral OC activation in cats had no effect on threshold shifts following binaural exposure to a 10 min 6-kHz tone. 2. In this study, anesthetized and curarized guinea pigs were exposed either monaurally or binaurally to tones of different duration (1-5 min), frequency (6 to 10 kHz) and intensity (105-118 dB SPL). For each exposure condition, threshold shifts were compared among ears with different levels of OC activation: in some cases, the OC bundle (OCB) was electrically stimulated during (and/or before) the acoustic overexposure; in others, the OCB was cut before the exposure; in control cases, the OCB was neither cut nor electrically stimulated. 3. Electrical stimulation of the OCB delivered simultaneously with acoustic overstimulation produced significant reductions in threshold shift only for acoustic exposures at higher frequencies (8 and 10 kHz) and shorter durations (1 and 2 min). The protective effects on 1-min exposures could be extinguished by prior stimulation of the OCB, i.e., if the OC stimulation was turned on 4 min before the acoustic overexposure.(ABSTRACT TRUNCATED AT 250 WORDS)

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