Petter Moe Omland

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OBJECTIVE We intended to study the effect of check size on visual evoked potential habituation in interictal migraine, using the faster 3 per second reversal rate and an improved analytic procedure with block-number blinding. BACKGROUND Habituation in migraineurs has been extensively studied with visual evoked potentials. Despite discrepant results,(More)
OBJECTIVE Lack of habituation is considered a neurophysiological hallmark of migraine. However, the results of visual evoked potential (VEP) studies have been discrepant, possibly because of different stimulation parameters and lack of blinding. Hence, there is a need for independent confirmation of lack of VEP habituation in migraine. In this blinded study(More)
OBJECTIVE High-frequency repetitive transcranial magnetic stimulation (rTMS) modulates cortical excitability. We investigated its effect on visual evoked potentials (VEPs) in migraine. METHODS Thirty-two headache-free controls (CO), 25 interictal (MINT) and 7 preictal migraineurs (MPRE) remained after exclusions. VEPs to 8' and 65' checks were averaged in(More)
Objective Studies suggest that pain thresholds may be altered before and during migraine headaches, but it is still debated if a central or peripheral dysfunction is responsible for the onset of pain in migraine. The present blinded longitudinal study explores alterations in thermal pain thresholds and suprathreshold heat pain scores before, during, and(More)
OBJECTIVE Sleep restriction seems to change our experience of pain and reduce laser evoked potential (LEP) amplitudes. However, although LEP-habituation abnormalities have been described in painful conditions with comorbid sleep impairment, no study has previously measured the effect of sleep restriction on LEP-habituation, pain thresholds, and(More)
OBJECTIVE Results have varied between studies of pattern-reversal visual evoked potential (PR-VEP) habituation, possibly caused by differences in stimulation parameters. Our aim was to estimate the interaction between check size and reversal rate on PR-VEP-habituation in healthy subjects. METHODS Thirty-four healthy volunteers participated. Mid-occipital(More)
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