COGNITIVE NEUROSCIENCE AND NEUROPSYCHOLOGYAn earlier component of face perception detected by seeing-as-face taskKato, Yutaka1 2 CA; Muramatsu, Taro1; Kato, Motoichiro1; Shintani, Masuro2; Yoshino, Fumihiro3; Shimono, Masaki2; Ishikawa, Tatsuya2Author Information 1Department of Neuropsychiatry, School of Medicine, Keio University, Shinanomachi, Shinjuku-ku, Tokyo 160-8582 2Laboratory of Brain Research, Oral Health Science Center, Tokyo Dental College, Chiba 261-8502 3Department of Neuropsychiatry, Tokyo Dental College Ichikawa General Hospital, Chiba 272-8513, Japan 1,CACorresponding Author and Address: firstname.lastname@example.org Received 29 August 2003; accepted 13 October 2003 NeuroReport: February 9th, 2004 - Volume 15 - Issue 2 - p 225-229 Buy SDC Abstract To investigate the time sequence of the neural processes underlying face perception, magnetoencephalography was performed using a seeing-as-face task, in which visual inputs were identical across two conditions, but subject perceptions differed: one being a non-specific pattern of geographical shapes, the other being a percept of a face. Subtraction between the two conditions revealed a response occurring 120 ms after stimulus onset in right occipital, ∼50 ms earlier than previously reported response at a latency of 170 ms at the right fusiform gyrus. As our novel task completely excluded differences in low-level properties of visual stimuli between control and face conditions, these two responses were considered specific to face perception. The result supported the two-stage theory of face processing. © 2004 Lippincott Williams & Wilkins, Inc.