Abstract
Functional MRI (fMRI) is an indirect depiction of the functionality of brain neurons using local changes of circulation. The continuous evolution of MRI led to pulse sequences which could display the circulation of the brain at rest, with or without exogenous contrast agents. fMRI seems capable of determining the dominant hemisphere and the language centers. This is important for the pre-operational evaluation of patients with lesions in the frontal or temporal lobes (tumors or epilepsy resistive to medication), which might have extended centers in these lobes.
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