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In the 1910s and 1920s, his chief focus was on the psychological mechanisms of epilepsy and on the personality of those with idiopathic epilepsy which he interpreted from a psychoanalytical perspective. He also described the epileptic voice sign, wrote psychobiographies of among others Abraham Lincoln and Napoleon Bonaparte, and published a book of poetry. He held many important positions in American professional societies and yet was embroiled in controversy.<\/jats:p>","DOI":"10.1002\/epi4.12589","type":"journal-article","created":{"date-parts":[[2022,3,5]],"date-time":"2022-03-05T12:28:12Z","timestamp":1646483292000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["The enigmatic figure of Leon Pierce Clark and his contribution to epilepsy"],"prefix":"10.1002","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0313-2001","authenticated-orcid":false,"given":"Simon D.","family":"Shorvon","sequence":"first","affiliation":[{"name":"UCL Queen Square Institute of Neurology University College London  London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2022,3,13]]},"reference":[{"key":"e_1_2_7_2_1","first-page":"369","article-title":"Leon Dennis Pierce Clark","volume":"79","author":"Jelliffe SE","year":"1934","journal-title":"J Nerv Ment Dis"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1176\/ajp.51.2.205"},{"key":"e_1_2_7_4_1","volume-title":"On epilepsy: anatomo\u2010pathological and clinical notes","author":"Echeverria MC","year":"1870"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1097\/00000441-190412000-00015"},{"key":"e_1_2_7_6_1","first-page":"291","article-title":"\u2018Status epilepticus: a clinical and pathological study in epilepsy\u2019 [article in three parts]","volume":"60","author":"Clark LP","year":"1903","journal-title":"Am J Insanity"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1017\/CBO9780511526930"},{"key":"e_1_2_7_8_1","volume-title":"Epilepsy and other chronic convulsive disorders: their causes, symptoms, & treatment","author":"Gowers WR","year":"1881"},{"key":"e_1_2_7_9_1","volume-title":"Epilepsy and other chronic convulsive diseases: their causes, symptoms, and treatment","author":"Gowers WR","year":"1881"},{"key":"e_1_2_7_10_1","volume-title":"Etudes cliniques et thermom\u00e9triques sur les maladies du syst\u00e8me nerveux","author":"Bourneville DM","year":"1873"},{"key":"e_1_2_7_11_1","volume-title":"Recherches cliniques et therapeutiques sur l\u2019epilepsie & l\u2019hysterie: compte\u2010rendu des observations recueillies \u00e0 la Salp\u00eatri\u00e8re de 1872 \u00e0 1875","author":"Bourneville DM","year":"1876"},{"key":"e_1_2_7_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/S1474-4422(06)70374-X"},{"key":"e_1_2_7_13_1","volume-title":"Epilepsy: a study of the idiopathic disease","author":"Turner WA","year":"1907"},{"key":"e_1_2_7_14_1","first-page":"195","volume-title":"Epilepsy and its treatment","author":"Clark LP","year":"1904"},{"key":"e_1_2_7_15_1","doi-asserted-by":"publisher","DOI":"10.1037\/13871-000"},{"key":"e_1_2_7_16_1","doi-asserted-by":"publisher","DOI":"10.1097\/00000441-191411000-00011"},{"key":"e_1_2_7_17_1","first-page":"385","article-title":"The nature and pathogenesis of epilepsy","volume":"101","author":"Clark LP","year":"1915","journal-title":"N Y Med J"},{"key":"e_1_2_7_18_1","first-page":"969","article-title":"A study of certain aspects of epilepsy compared with the emotional life and impulsive movements of the infant","volume":"22","author":"Clark LP","year":"1915","journal-title":"Int Med J"},{"key":"e_1_2_7_19_1","doi-asserted-by":"publisher","DOI":"10.1097\/00005053-191605000-00019"},{"key":"e_1_2_7_20_1","doi-asserted-by":"crossref","unstructured":"ClarkLP.Some therapeutic suggestions derived from the newer psychological studies upon the nature of essential epilepsy. Medical Record March 4 1916.","DOI":"10.1097\/00005053-191605000-00019"},{"key":"e_1_2_7_21_1","unstructured":"ClarkLP.The psychological and therapeutic value of studying mental content during and following epileptic attacks. New York Medical Journal. Oct. 13 1917."},{"key":"e_1_2_7_22_1","unstructured":"ClarkLP.A further study of mental content in epilepsy. Psychiatric Bulletin Oct 13 1917."},{"key":"e_1_2_7_23_1","volume-title":"Clinical studies in epilepsy","author":"Clark L","year":"1917"},{"key":"e_1_2_7_24_1","unstructured":"ClarkLP.The true epileptic. New York Medical Journal. 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