Co-speech gesture production in an animation-narration task by bilinguals: A near-infrared spectroscopy study

► We examine the neural mechanism of co-speech gesture production using NIRS. ► Activation of the left IFG increased from before to after gesture production. ► Activation of the left pSTS decreased in line with an increase in the left IFG. ► The left IFG appears to be involved in the gesture production. ► The left pSTS appears to be modulated by the speech load.