These procedures include hyperventilation, photic stimulation ( with a strobe light ), eye closure, mental activity, sleep and sleep deprivation.
2.
More precise investigation can be carried out by combining an EEG with a device producing " Intermittent Photic Stimulation " ( IPS ).
3.
This approach has been proposed as an alternative to the BOLD fMRI technique and used to detect visual response to photic stimulation, motor activation by finger tapping and activations in language areas during speech processing.
4.
Here the ability of fMRS to measure chemical processes in the brain over time proved crucial for confirming that repetitive photic stimulation causes higher increase of the lactate level and higher decrease of the N-acetylaspartate ( NAA ) level in the visual cortex of MwA patients compared to migraine without aura ( MwoA ) patients and healthy individuals.
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