摘要The tactile P300 brain-computer interface (BCI) is related to the somatosensory perception and response of the human brain,and is different from visual or audio BCIs.Recently,several studies focused on the tactile stimuli delivered to different parts of the human body.Most of these stimuli were symmetrically bilateral.Only a few studies explored the influence of tactile stimuli laterality.In the current study,we extensively tested the performance of a vibrotactile BCI system using ipsilateral stimuli and bilateral stimuli.Two vibrotactile P300-based paradigms were tested.The target stimuli were located on the left and right forearms for the left forearm and right forearm (LFRF) paradigm,and on the left forearm and calf for the left forearm and left calf (LFLC)paradigm.Ten healthy subjects participated in this study.Our experiments and analysis showed that the bilateral paradigm (LFRF) elicited larger P300 amplitude and achieved significantly higher classification accuracy than the ipsilateral paradigm (LFLC).However,both paradigms achieved classification accuracies higher than 70％ after the completion of several trials on average,which was usually regarded as the minimum accuracy level required for BCI system to be deemed useful.