Sensory stimulation enhances phantom limb perception and movement decoding

Area of Science:

• Neuroscience
• Biomedical Engineering
• Rehabilitation Medicine

Background:

• Prosthetic arm control is hindered by poor communication between the device and the user's phantom limb.
• Enhancing phantom limb perception is crucial for improving the dexterity and usability of prosthetic limbs.

Purpose of the Study:

• To investigate the impact of targeted transcutaneous electrical nerve stimulation (TENS) on phantom limb perception and prosthetic arm movement decoding.
• To assess the neural correlates of enhanced phantom limb perception using electroencephalogram (EEG).

Main Methods:

• Four participants with arm amputation underwent TENS to map phantom limb perception.
• Myoelectric signals and EEG data were recorded during phantom hand movements before and after sensory stimulation.
• Longitudinal tracking of sensory mapping and movement decoding performance was conducted in one participant.

Main Results:

• Sensory stimulation significantly improved phantom limb perception and hand movement decoding.
• EEG revealed cortical correlates of sensorimotor integration and increased motor-related neural activity.
• Sensory mapping remained stable over two years, and movement decoding performance was stable over one year.

Conclusions:

• Targeted nerve stimulation can enhance phantom limb perception, directly benefiting prosthetic arm control.
• Improved sensory feedback from the phantom limb leads to better prosthesis usability and function.
• This approach offers a promising strategy for developing more integrated and intuitive prosthetic devices.