Identical comparison stimuli were induced to be recognized as schematic faces or the figures with three English letters ‘O’ (EngO) by verbal bias and two different contextual priming conditions. Our findings confirmed that there might be a coarse visual categorization around 40–100 ms at mid-parietal site. Larger P1 responses to schematic faces compared with EngO definitely revealed that P1 at occipito-temporal sites should be thought to represent an earlier face-specific processing stage, as early as around 100–120 ms after stimulus onset rather than simply reflect the low-level visual difference. A significant difference of N170/vertex positive potential between the identical comparison stimuli reinforced the evidence that they were early markers of face processing and corroborated the unequivocal influence of contextual effect.
Department of Psychology, School of Aerospace Medicine, Fourth Military Medical University, Xi'an, China
Correspondence to Professor Danmin Miao, Department of Psychology, School of Aerospace Medicine, Fourth Military Medical University, Chang Le Western Street, No. 17, Xi'an Shaanxi, CO.710032, The People's Republic of China
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*Jingjing Gong and Jing Lv contributed equally to this work.
Received 23 January 2008; accepted 3 February 2008