Making the lifetime connection between brain and machine for restoring and enhancing function

Area of Science:

• Neuroscience
• Biomedical Engineering
• Neural Engineering

Background:

• Developing long-lasting neural interfaces is key for neural prosthetics and brain function enhancement.
• Successful interfaces require secure electrode integration with surrounding neural tissue.

Purpose of the Study:

• To demonstrate a reliable, long-term neural interface for recording neural activity.
• To explore the use of recorded neural signals for speech and auditory tasks.

Main Methods:

• Implanted electrodes were used to record stable single and multiunit neural activity in three subjects.
• A paralyzed and mute subject used recorded single units to recognize phonemes and perform speech tasks.
• Decoding methods and auditory feedback were employed to train the subject in speech production.

Main Results:

• Single units were reliably recorded for over five years, showing an inverse relationship between firing rate and amplitude.
• Over half of English phonemes were recognized using single-unit activity in a speech motor cortex implant.
• The subject achieved an 80% success rate in producing four vowels with audio feedback.

Conclusions:

• Reliable, long-term neural recording is achievable through neural tissue integration.
• Single units are critical for precise neural decoding, particularly in speech tasks.
• Neural interfaces hold significant potential for neural prosthetics and cognitive enhancement.