Higher Cortical Dysfunction

Non-dominant

Dominant

visual and spatial perception visual (non language-dependent) memory language language-dependent memory

Hemisphere dominance may be demonstrated by the injection of sodium amytal into the internal carotid artery. On the dominant side this will produce an arrest of speech for up to 30 seconds - the WADA TEST. Such a test may be important before temporal lobectomy for epilepsy when handedness/hemisphere dominance is in doubt.

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