Final cortical stimulation map from a representative patient (P1). One syntactic encoding site was observed in this patient, localized to the pars triangularis of the inferior frontal gyrus (label G, yellow circle). Six other language sites were documented: stimulation of A, B, C, D and F resulted in speech arrest, while stimulation of site E interfered with comprehension. Sites 1 through 5 were sensorimotor sites. Abbreviations: cs = central sulcus; ifs = inferior frontal sulcus; prcs = precentral sulcus; arsf = ascending ramus of Sylvian fissure; hrsf = horizontal ramus of Sylvian fissure; op = pars opercularis of the inferior frontal gyrus; tri = pars triangularis of the inferior frontal gyrus; sf = Sylvian fissure; pstg = posterior superior temporal gyrus.