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Working memory is essential to learning and performing sensory-motor behaviors that in many situations require the integration of stimuli of one modality with stimuli of another.In the present study, we focused on the neural mechanisms underlying crossmodal working memory.Our previous studies revealed that in performance of the tactile crossmodaI working memory task, there would be sequentially discrete task-correlated neural activities representing the processes of crossmodal working memory.In this study, participants performed the visual and auditory crossmodal working memory tasks while the EEG signals were recorded.Two positive event-related potential peaks LPC-1 and LPC-2 were observed during the delay of the task.The sLORETA analysis revealed that in the visual-tactile crossmodal task, LPC located in superior parietal cortex, while in the auditory-tactile crossmodal task, LPC located in supermarginal gyrus.The present study shows the sources of the late components which involved in crossmodal working memory.Combined with our former results of SI affected by crossmodal influence, this study revealed a potential processing flow from primary sensory cortices to association cortices.