ERP probe technique without probe stimulus: Heartbeat-evoked potentials reflect physical attractiveness
Kohei Fuseda1, Jun'ichi Katayama1; 1Department of Psychological Science, Kwansei Gakuin University,
The ERP probe technique is useful method to evaluate the amount of interest in video clips. Although task-irrelevant probe stimuli do not require any action, it might become a distractor during a passive viewing of video clips. Then, the purpose of this study is to establish a new method without probe stimuli to evaluate the degree of physical attractiveness using a heartbeat-evoked brain potential (HEP). Twelve males and twelve females were received both probe and no-probe conditions during watching the 7 minutes video clips of attractive or unattractive models. In the no-probe condition, instead of the probe stimulus, R-waves of the electrocardiogram were used as a trigger, i.e., the HEP was measured. In the probe condition, the electrical stimuli as probe stimuli were presented in an oddball sequence: frequent (80%) and infrequent stimuli (20%) were presented at each wrist every 1000 ms. P2 amplitude to both the frequent and infrequent probe stimuli during watching attractive models was significantly smaller than watching unattractive ones. In contrast, HEP amplitude in the no-probe condition was larger for attractive models. Results in the probe condition indicated that attentional resource was more allocated to attractive models. Larger HEP for the attractive models in the no-probe condition shows that we can evaluate the degree of physical attractiveness without probe stimuli, i.e., without distraction for the watching video clips.
Topic Area: EMOTION & SOCIAL: Emotional responding