الفهرس 
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Abstract
Headache is considered one of the major complaint in everyday life for
many people. Most people will suffer from headaches at some point or
another throughout their lives. Pain in the head or face is the main
symptom of a headache. Headaches come in a variety of forms, with
tension headaches being the most prevalent. While the majority of
headaches are not dangerous, some types may indicate a serious
underlying condition.
Many countries became aware that headache disorders represent an
important threat to public health. In spite of the discrepancies among
different studies, the overall picture resulting from evaluationof
thepatterns that we find in central electrophysiological maneuvers clearly
confirms that primary headache disorders can cause these patterns which
may help us not only in the diagnosis of different types of primary
headache disorders , but also in understanding the pathophysiology of
different headache disorders.
According to changes in visual evoked potentials in migraine, many
studies found that the SS-VEP frequently has a larger amplitude in both
types of migraine although some studies showed Reduction in SS-VEP
response. In conventional VEP, many studies showed higher VEP
amplitudes compared with controls. Deficient VEP habituation to
repeated stimuli was reported an most of studies.
As regard changes in VEP in Tension headache patients, most of the
results have found that there is No significant changes in P100 latency
and amplitude.
According to changes in BAEP in migraine, many results found that
latencies are greater and more asymmetric in migraineurs. In contrast
minority of studies found that there are no changes in BAEP in146
migraineurs as regard short, middle and long latencies as well as
habituation. In contrast, all of the results of BAEP in Tension headache
patients showing that there are no changes in BAEP.
Regarding changes in blink reflex in migraine, most of the results found
there is no changes in conventional BR in migraineurs, the same findings
were found in Nociception-specific blink reflex although some studies
found that R2 amplitude was noticed to increase and latency decreased on
the side of the pain in migraine patient during attacks. Lack of habituation
in migraine was the hallmark finding when studying habituation. In
contrast, some of the results of BR in Tension headache patients showing
that there are no changes in while some showed that ipsilateral and
contralateral R2 values are extended. in Nociception-specific blink reflex
ther were no changes again.
Changes in QEEG in migraine during headache attacks range from
slowing and reduced alpha rythm to decreased interictal EEG coherence.
In preectial phase, an increase in beta-ERD (Event Related
Desynchrinization) as well as increased alpha range flicker along with
sluggish and asymmetric background activity appeared. In tension
headache, Spikes, sharp waves, slow waves, and an increase in theta
activity are some examples of abnormalities.