Superior frontal gyrus

The superior frontal gyrus (SFG) also marginal gyrus, makes up about one third of the frontal lobe of the human brain. It is bounded laterally by the superior frontal sulcus.Position of superior frontal gyrus (shown in red)Left cerebral hemisphere seen from aboveLateral surface of left cerebral hemisphereMedial surface of left cerebral hemisphereCerebrum. Lateral view. Deep dissection. Superior frontal gyrus labelled at top-left. The superior frontal gyrus (SFG) also marginal gyrus, makes up about one third of the frontal lobe of the human brain. It is bounded laterally by the superior frontal sulcus. The superior frontal gyrus is one of the frontal gyri. In fMRI experiments, Goldberg et al. have found evidence that the superior frontal gyrus is involved in self-awareness, in coordination with the action of the sensory system. In 1998, neurosurgeon Itzhak Fried described a 16-year-old female patient (referred to as 'patient AK') who laughed when her SFG was stimulated with electric current during treatment for epilepsy. Electrical stimulation was applied to the cortical surface of AK's left frontal lobe while an attempt was made to locate the focus of her epileptic seizures (which were never accompanied by laughter).