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Upper-extremity amputees who use myoelectric prostheses currently lack thehaptic sensory information needed to perform dexterous activities of dailyliving. While considerable research has focused on restoring this hapticinformation, these approaches often rely on single-modality feedback schemeswhich are necessary but insufficient for the feedforward and feedback controlstrategies employed by the central nervous system. Multi-modality feedbackapproaches have been gaining attention in several application domains, however,the utility for myoelectric prosthesis use remains unclear. In this study, weinvestigated the utility of dual-modality haptic feedback in a virtualEMG-controlled grasp-and-hold task with a brittle object and variable loadforce. We recruited N=20 non-amputee participants to perform the task in fourconditions: no feedback, vibration feedback of incipient slip, squeezingfeedback of grip force, and dual (vibration + squeezing) feedback of incipientslip and grip force. Results suggest that receiving any feedback is better thanreceiving none, however, dual-modality feedback is far superior to eithersingle-modality feedback approach in terms of preventing the object frombreaking or dropping, even after it started slipping. Control withdual-modality feedback was also seen as more intuitive than with either of thesingle-modality feedback approaches.

Dual-Modality Haptic Feedback Improves Dexterous Task Execution with Virtual EMG-Controlled Gripper