Fig. 1.

Schematic representation of stimuli. Trials consisted of fixation, blank jitter, stimuli presentation and decision. All the auditory stimuli consisted with 12 syllables with each syllable lasts about 200 ms. The facial stimuli were presented with same duration as the auditory stimuli. ‘N’ and ‘A’ represents neural and angry vocal emotion respectively, while ‘n’ and ‘a’ represents neural and angry facial emotion respectively. By combinations of the two modalities, for types of stimuli (no-change, facial-change, vocal-change and bimodal-change) were established