Journal
SCIENCE CHINA-LIFE SCIENCES
Volume 56, Issue 9, Pages 835-847Publisher
SCIENCE PRESS
DOI: 10.1007/s11427-013-4527-8
Keywords
facial expression; single trial; event-related potential (ERP); three stages
Categories
Funding
- National Natural Science Foundation of China [31170984, 31000503, 91132704]
- National Basic Research Program of China [2011CB711000]
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Using a rapid serial visual presentation paradigm, we previously showed that the average amplitudes of six event-related potential (ERP) components were affected by different categories of emotional faces. In the current study, we investigated the six discriminating components on a single-trial level to clarify whether the amplitude difference between experimental conditions results from a difference in the real variability of single-trial amplitudes or from latency jitter across trials. It is found that there were consistent amplitude differences in the single-trial P1, N170, VPP, N3, and P3 components, demonstrating that a substantial proportion of the average amplitude differences can be explained by the pure variability in amplitudes on a single-trial basis between experimental conditions. These single-trial results verified the three-stage scheme of facial expression processing beyond multitrial ERP averaging, and showed the three processing stages of fear popup, emotional/unemotional discrimination, and complete separation based on the single-trial ERP dynamics.
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