One of his earlier brain studies showed that numerous regions, including the insula and orbital frontal cortex, jump into action when such discordance occurs, trying to make sense of it.

In this action bolt has two frontal lugs that engage the barrel extension, which is screwed onto the barrel.

CONCLUSION: Facial expression effect can occur in bilateral parietal-occipital area and frontal-partial area at early period, indicating that the action of cortical pathway may be not lagged.