Neural evidence for functional roles of tactile and visual feedback in the application of myoelectric prosthesis.

EEG results showed that VF played a predominant role in GFC and BABC tasks. It was reflected by a significantly lower somatosensory alpha event-related desynchronization (ERD) in TVF than in TF and no significant difference in visual alpha ERD between TVF and VF. In PFPC task, there was no significant difference in somatosensory alpha ERD between TF and TVF, while a significantly lower visual alpha ERD was found in TVF than in VF, indicating that TF was essential in situations related to proprioceptive position perception. Tactile-visual integration was found when TF and VF were congruently implemented, showing an obvious activation over the premotor cortex in the three tasks. Behavioral and psychophysical results were consistent with EEG evaluations. Signi cance. Our findings could provide neural evidence for multi-sensory integration and functional roles of tactile and visual feedback in a practical setting of prosthesis control, shedding a multi-dimensional insight into the functional mechanisms of sensory feedback.