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Abnormal visual processing in migraine with aura: a study of steady-state visual evoked potentials.

Abstract：

BACKGROUND:Although a number of studies reported different interictal findings between migraine with aura (MA) and migraine without aura (MO), the pathophysiology of the visual aura in migraine remains unclear. OBJECTIVE:To investigate the visual processing in patients who experience MA between attacks using steady-state visual evoked potentials (SSVEPs). METHODS:SSVEPs to high (98%) and low (29%) contrast black and white checkerboard gratings with two spatial frequencies (0.5 and 2.0 cpd) at 5 and 10 Hz (10 and 20 reversal/s) were recorded binocularly from 10 patients with MA, 10 patients with MO between attacks and 20 healthy controls (HC). The SSVEPs were Fourier analyzed to obtain the amplitude and phase of the second (2F) and fourth (4F) harmonic response. RESULTS:In the amplitude of 2F, at 0.5 cpd, there was significant increased amplitude in both MA and MO in comparison to HC at 5 Hz in high and low contrast. However, no significant differences were detected at 2.0 cpd in both 5 and 10 Hz in high and low contrast. In the amplitude of 4F, at 2.0 cpd, there was significant increased amplitude in MA in comparison to MO and HC at 10 Hz in high contrast. However, there were no significant differences at 0.5 cpd at both 5 and 10 Hz in high and low contrast. There were no significant phase differences between MA, MO, and HC. CONCLUSION:The high amplitude of the SSVEPs suggests that interictally migraine patients have abnormal excitability in the primary visual cortex, and this change in excitability may exist, at least partially, in the visual association cortex in MA.

journal_name

J Neurol Sci

journal_title

Journal of the neurological sciences

authors

Shibata K,Yamane K,Otuka K,Iwata M

doi

10.1016/j.jns.2008.04.004

subject

Has Abstract

pub_date

2008-08-15 00:00:00

pages

119-26

issue

1-2

eissn

0022-510X

issn

1878-5883

pii

S0022-510X(08)00161-5

journal_volume

271

pub_type

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