PHOSPHENES INDUCED BY MAGNETIC STIMULATION OVER THE OCCIPITAL BRAIN - DESCRIPTION AND PROBABLE SITE OF STIMULATION

被引：127

作者：

MARG, E

RUDIAK, D

机构：

[1] School of Optometry, University of California, Berkeley, CA

来源：

OPTOMETRY AND VISION SCIENCE | 1994年 / 71卷 / 05期

关键词：

PHOSPHENE; MAGNETIC STIMULATION; OCCIPITAL; OPTIC RADIATION; VENTRICLE;

D O I：

10.1097/00006324-199405000-00001

中图分类号：

R77 [眼科学];

学科分类号：

100212 ;

摘要：

Phosphenes were elicited by brief, intense magnetic pulses directed to the occipital area of the brain with two different magnetic stimulators and various coils. The observed phosphenes were described or sketched by the subject. Phosphenes were usually wedge-shaped flashes of light in the midperiphery, although occasionally structured phosphenes were reported (stripes or grids). The depth of effective stimulation was measured by determining the phosphene threshold for two different size coils. Additional depth measurements were made at the cortical motor strip for threshold finger twitches. The visual stimulation site was clearly deeper (approximately 4 cm) than the site for motor stimulation (approximately 2 cm), and lay near the midline. Both foveal and peripheral phosphenes had identical stimulation depths, implying a subcortical stimulation site, possibly in the optic radiation fibers adjacent to the posterior tip of the lateral ventricles. Fibers closest to the ventricle, representing the horizontal meridian of the visual field, would be preferentially stimulated, in agreement with experimental results.

引用

页码：301 / 311

页数：11

共 32 条

[1]

Marg E., Magnetostimulation of vision: Direct noninvasive stimulation of the retina and visual brain, Optom Vis Sci, 68, pp. 427-440, (1991)

[2]

Marg E., Newman R., Comparison of retinal and cortical mag-netophosphene thresholds, Invest Ophthalmol Vis Sci, 31, (1990)

[3]

Epstein C.M., Schwartzberg D.G., Davey K.R., Sudderth D.B., Localizing the site of magnetic brain stimulation in humans, Neurology (NY), 40, pp. 666-670, (1990)

[4]

Schmid U.D., Moller A.R., Schmid J., Transcranial magnetic stimulation excites the labyrinthine segment of the facial nerve: An intraperative electrophysiological study in man, Neurosci Lett, 124, pp. 273-276, (1991)

[5]

Maccabee P.J., Amassian V.E., Cracco R.Q., Cracco J.B., Anziska B.J., Intracranial stimulation of facial nerve in humans with the magnetic coil, EEG Clin Neurophysiol, 70, pp. 350-354, (1988)

[6]

Amassian V.E., Maccabee P.J., Cracco R.Q., Focal stimulation of human peripheral nerve with the magnetic coil: A comparison with electrical stimulation, Exp Neurol, 103, pp. 282-289, (1989)

[7]

Maccabee P.J., Amassian V.E., Cracco R.Q., Eberle L., Rudell A.P., Effective anode and cathode are very close together when stimulating peripheral nerve with the magnetic coil, Neurosci Abstr, 16, (1990)

[8]

Maccabee P.J., Amassian V.E., Eberle L.P., Rudell A.P., Cracco R.Q., Lai K.S., Somasundaram M., Measurement of the electric field induced into homogeneous volume conductors by magnetic coils: Application to human spinal neurogeometry, EEG Clin Neurophysiol, 81, pp. 224-227, (1991)

[9]

Ugawa Y., Rothwell J.C., Day B.L., Thompson P.D., Marsden C.D., Magnetic stimulation over the spinal enlargements, J Neurol Neurosurg Psychiatry, 52, pp. 1025-1032, (1989)

[10]

Britton T.C., Meyer B.U., Herdmann J., Benecke R., Clinical use of the magnetic stimulator in the investigation of peripheral conduction time, Muscle Nerve, 13, pp. 396-406, (1990)

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