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The EEG signature of IGE is bisynchronous, symmetric, and generalized spike\u2010wave complex; although focal, irregular, and so called \u201cfragments\u201d of discharges are not uncommon. Other characteristic EEG features include polyspikes, polyspike\u2010wave discharges, occipital intermittent rhythmic delta activity, and photoparoxysmal response. Both human and animal data suggest involvement of the thalamus and the cortex in the generation of spike\u2010wave discharges in IGE. Circadian variations of generalized epileptiform discharges are well described, and these can be useful in diagnostic confirmation. Those discharges tend to occur more often after awakening and during cyclic alternating pattern phase\u2010A of non\u2013rapid eye movement sleep. Activation procedures such as hyperventilation, intermittent photic stimulation, eye closure, and fixation\u2010off are useful techniques to increase the yield of both interictal and ictal EEG abnormalities. Although not in routine use, specific triggers such as pattern stimulation and cognitive tasks may also be of value in eliciting rare reflex seizure\u2010related EEG abnormalities. Variations of EEG abnormalities are evident between different electroclinical syndromes. EEG is also affected by certain external as well as internal factors, which should be borne in mind when interpreting EEG studies in IGE.<\/jats:p>","DOI":"10.1111\/j.1528-1167.2011.03344.x","type":"journal-article","created":{"date-parts":[[2011,12,9]],"date-time":"2011-12-09T14:25:46Z","timestamp":1323440746000},"page":"234-248","source":"Crossref","is-referenced-by-count":125,"title":["The electroencephalogram of idiopathic generalized epilepsy"],"prefix":"10.1111","volume":"53","author":[{"given":"Udaya","family":"Seneviratne","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mark","family":"Cook","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wendyl","family":"D\u2019Souza","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2011,12,9]]},"reference":[{"key":"e_1_2_23_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1528-1157.1998.tb01419.x"},{"key":"e_1_2_23_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/0014-4886(82)90252-7"},{"key":"e_1_2_23_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/0013-4694(74)90031-5"},{"key":"e_1_2_23_5_1","doi-asserted-by":"publisher","DOI":"10.1159\/000117429"},{"key":"e_1_2_23_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1528-1157.1985.tb05704.x"},{"key":"e_1_2_23_7_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1528-1167.2005.00311.x"},{"key":"e_1_2_23_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0079-6123(05)50020-7"},{"key":"e_1_2_23_9_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1528-1167.2009.02110.x"},{"key":"e_1_2_23_10_1","doi-asserted-by":"publisher","DOI":"10.1212\/WNL.30.1.42"},{"key":"e_1_2_23_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.braindev.2004.01.008"},{"key":"e_1_2_23_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/0306-4522(91)90332-I"},{"key":"e_1_2_23_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/0013-4694(74)90099-6"},{"key":"e_1_2_23_14_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1528-1157.1989.tb05316.x"},{"key":"e_1_2_23_15_1","first-page":"3","article-title":"Epilepsy and 3 per second spike and wave rhythms. 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