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Face identification relies on the use of horizontally-oriented facial structure. The degree of horizontal bias (HB) is correlated with overall face identification accuracy, as well as the size of the inversion effect, and HB to inverted faces increases after practice with identifying inverted faces. In addition, faces elicit an EEG response sensitive to horizontal structure: When the horizontal structure of upright faces is removed, the N170 is delayed and reduced in amplitude, and the N250 also is reduced in amplitude. Furthermore, the N250 amplitude difference to horizontal vs. vertical structure is correlated with upright face identification accuracy. Here, we asked if the sensitivity of the N170 and N250 to horizontal structure in inverted faces changes with practice. Eleven participants completed a one-of-six inverted face identification task. Over the course of 2 sessions, identification accuracy improved from 56% to 78 …