Fig. 3.

Cortical sites with categorical responses to Chinese lexical tones. (A) The grid electrode coverage for the six subjects. Categorical response sites are colored in red on each individual subject’s cortical surface. (B) Categorical responsive sites and the corresponding categorical values were interpolated and mapped onto the averaged inflated brain model. Categorical sites: bilateral superior temporal gyrus (STG, n = 16); bilateral middle temporal gyrus (MTG, n = 8); bilateral primary motor, somatosensory and premotor cortex (motor, n = 10). Comparison of (C) response peak power and (D) categorical value between STG of two hemisphere (mean ± SEM; Wilcoxon rank-sum test; *P < 0.05; right STG, n = 7; left STG, n = 9).