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Brain, Vol. 116, No. 6, 1565-1574, 1993
© 1993 Guarantors of Brain

research-article

Pathological left-handedness

Left-handedness correlatives in adult epileptics

Georges Dellatolas1, Sylvia Luciani1, Angela Castresana2, Claude Rémy5, Pierre Jallon6, Dominique Laplane3 and Jean Bancaud4

1Unit 169 of INSERM, Epidemiological Research Villejuif 2Department of Neurophysiology, Hôpital Cochin Paris 3Department of Neurology Hôpital Pitié-Salpêtrière 4Unit 97 of INSERM, Research in Epileptology Paris 5Etablissement Médical La Teppe, Tain l'Hermitage France 6Department of Neurophysiology, Hôpital Cantonal Universitaire Geneva, Switzerland

Correspondence to: Correspondence to: Dr G. Dellatolas, INSERM U169, 16 avenue Paul Vaillant-Couturier, 94807 Villejuif, France.

Factors associated with left-handedness were examined in a large sample of adults who suffered with epileptic seizures (n = 446) in an attempt to delineate the concept of pathological left-handedness. Three main pathological factors were found associated with left-handedness: (i) right-hemiparesis of early onset; (ii) cognitive deficit; (iii) evidence of left-hemisphere disease on clinical examination. Familial sinistrality was also associated with left-handedness, independently of the above-mentioned pathological factors. Results support a clear-cut distinction between normal and pathological left-handedness. This distinction seems presently important for the evaluation of the great number of anomalies proposed to be associated with left-handedness.

Received July 16, 1992. Revised February 23, 1993. Accepted July 9, 1993.


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