Poster A94, Saturday, March 24, 1:30–3:30 pm, Exhibit Hall C
Role of Facial Expression Conflict in Motor Inhibition
Cheng-I Lam1, Trung Nguyen1, Che-Yi Hsu1, Chi-Hung Juan1; 1Institute of Cognitive Neuroscience, National Central University, No.300, Jhongda Road., Jhongli county, Taoyuan City - 32001, Taiwan
Emotional facial expression discrimination plays an important role in our social interaction and communication. Present study aims to investigate the interaction between conflicting facial expression and motor inhibition with a conditional stop signal task with gripping force. The task introduced a continue Go signal, which requires the same motor response as in a go trial but share similar properties with stop signal. Two experimental conditions were manipulated to elucidate the relationships: 1) Subjects are required to stop or continue with action according to signal which is in specific facial expression (i.e. Facial Expression Discrimination Condition). 2) The stop signal and continue signals are only in simple feature difference and no facial expression discrimination required (i.e. No Facial Expression Discrimination Condition). Current results found that the reaction time of unsuccessfully inhibiting response is longer in facial expression discrimination condition than condition without discrimination. Interestingly, the result shows pattern of decreasing non-cancelled reaction time along with stop signal delay. Current result suggests that when facial expression conflict is involved, the interference on early controlled stage in unsuccessfully inhibit response process and ongoing response is getting stronger than condition without discrimination involved, and result in later end point of the race. In summary, the result supports the hypothesis that facial expression conflict interacts with motor inhibition. Therefore, we think that this study may provide us with a better picture on how the motor control behavior is modulated within the social related context.
Topic Area: PERCEPTION & ACTION: Motor control