- 1 MCG : Basic MCG 3 - 1 - 1 : Magnetocardiography

than 40 or less than -40 was defined as left or right hemisphere language dominancy, respectively. Otherwise, language dominancy was not determined (ambiguous). The relationship between the side of epileptogenic focus and language-dominant hemisphere was investigated.Results: Language dominancy was identified in the left hemisphere in 75% (9/12) of the cases with right hemisphere epilepsy, in 52% (12/23) of left hemisphere epilepsy, and in 25% (1/4) of epilepsy with unknown focus. Results were not interpretable for technical reasons in 4 patients. Conclusion: The right-side or ambiguous language dominancy is relatively frequent in patients with intractable focal epilepsy, especially in those with epileptogenic focus in the left hemisphere, implying that the presence of epileptogenic lesion could re-distribute language function in the brain. This finding should be taken into consideration in planning epilepsy surgery and estimating risks in post-operative language deficits.