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The vast majority of cases of mental retardation were considered to be caused by genotype but some exogenous causes were observed in discordant monozygotic twins.<\/jats:p>\n                  <jats:p>Paroxysmal discharges in the EEG especially those of centrencephalic type were suspected to be bio-electrical expressions of a transmissible cerebral susceptibility which may easily lead to intellectual deterioration by brain damage or epilepsy.<\/jats:p>","DOI":"10.3109\/00048677609159494","type":"journal-article","created":{"date-parts":[[2008,10,22]],"date-time":"2008-10-22T12:39:07Z","timestamp":1224679147000},"page":"157-162","source":"Crossref","is-referenced-by-count":0,"title":["Electroencephalographic Study of Mentally Retarded Twins"],"prefix":"10.1177","volume":"10","author":[{"given":"Takao","family":"Hattori","sequence":"first","affiliation":[{"name":"Psychiatric Department, Koritsu-Tosei Hospital, Seto, Aichi, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[1976,6,1]]},"reference":[{"key":"bibr1-00048677609159494","volume-title":"Etiology of Mental Subnormality in Twins.","author":"Allen G.","year":"1962"},{"key":"bibr2-00048677609159494","doi-asserted-by":"publisher","DOI":"10.1136\/bmj.1.5190.1911"},{"key":"bibr3-00048677609159494","doi-asserted-by":"publisher","DOI":"10.1001\/archneur.1965.00470030003001"},{"key":"bibr4-00048677609159494","doi-asserted-by":"publisher","DOI":"10.1055\/s-0028-1091777"},{"key":"bibr5-00048677609159494","doi-asserted-by":"publisher","DOI":"10.1111\/j.1528-1157.1973.tb03942.x"},{"key":"bibr6-00048677609159494","volume-title":"Mental Deficiency.","author":"Hilliard L. 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