How we'll become cyborgs and extend human potential | Hugh Herr

Bionic Legs and NeuroEmbodied Design

Introduction to Bionic Technology

• The speaker, an MIT professor, specializes in building bionic legs that enhance human mobility after losing limbs due to a mountain-climbing accident in 1982.

• The bionic legs consist of advanced technology including 24 sensors, six microprocessors, and muscle-tendon-like actuators, allowing the speaker to perform activities like skipping and dancing.

Neural Communication with Bionic Limbs

• While the bionic legs respond to neural signals from the central nervous system, they lack the ability to send sensory feedback back into the nervous system.

• This absence of sensory feedback means that the speaker does not experience normal sensations of touch or movement in their synthetic limbs.

Concept of Cyborg Integration

• The idea of NeuroEmbodied Design is introduced as a methodology for creating cyborg functions by integrating biological bodies with synthetic enhancements.

• This design philosophy envisions a future where technology seamlessly merges with human biology, blurring lines between what is natural and artificial.

Future Implications of NeuroEmbodied Design

• The goal is to extend human capabilities beyond physiological limits through scientific advancements in prosthetics and augmentation technologies.

• By improving communication between biological bodies and synthetic designs, there is potential to eliminate disabilities in the 21st century.

Current Challenges in Amputation Paradigms

• The existing methods for amputations have not evolved significantly since the Civil War era despite advancements in technology.

• A major issue with current prosthetics is their inability to replicate dynamic muscle interactions necessary for proprioception—the sense of body position.

Understanding Proprioception

• Proprioception involves muscles working together during movements; this interaction sends vital information about limb positioning back to the brain.

• Standard artificial limbs fail to provide this feedback loop, leading users unable to sense their prosthetic's position without visual confirmation.

Innovations: Agonist-Antagonist Myoneural Interface (AMI)

• To address these challenges, MIT developed AMI—a method connecting nerves within residual limbs directly to external bionic devices.

• AMI utilizes two surgically connected muscles (agonist-antagonist), enabling natural muscle dynamics that facilitate proprioceptive feedback through nerve signals.

Functionality of AMI

• When activated electrically, agonist muscles contract while stretching antagonists; this interaction allows biological sensors within tendons to relay information about movement back to the brain.

• Multiple AMIs can be created for controlling various prosthetic joints; electrodes decode signals from these muscles for precise motor control on bionic limbs.

Jim's Journey: From Tragedy to Triumph

The Climbing Accident

• Jim experienced a severe climbing accident, falling 50 feet in the Cayman Islands due to a rope failure, resulting in multiple injuries including punctured lungs and broken bones.

• Following the accident, Jim aspired to return to mountain climbing, prompting the need for advanced medical intervention.

Team Cyborg and Surgical Innovations

• Team Cyborg was formed at MIT, comprising surgeons, scientists, and engineers dedicated to restoring Jim's climbing abilities.

• Dr. Matthew Carty performed an amputation of Jim's damaged leg using the AMI surgical procedure, which involved creating tendon pulleys attached to his tibia bone.

Neural Connections and Bionic Limbs

• The AMI procedure reestablished neural links between Jim’s ankle-foot muscles and his brain, allowing him to experience normal sensations related to limb movement.

• In the MIT lab, electrodes linked Jim’s AMI muscles with a bionic limb; he quickly learned how to control it in four distinct directions.

Remarkable Recovery and Natural Movement

• After standing up with the bionic limb, Jim exhibited natural biomechanics as reflexive actions emerged during stair ascent.

• His central nervous system received proprioceptive signals that enabled him to control the synthetic limb naturally without conscious effort.

Neurological Embodiment Experience

• An incident where Jim stepped on electrical tape demonstrated his instinctual response; he shook it off rather than awkwardly reaching down.

• Jim expressed that "the robot became part of me," indicating a deep neurological connection with his prosthetic limb.

Implications of NeuroEmbodied Design

• By achieving bidirectional neural connections with his synthetic limb, neurological embodiment allowed Jim to feel as if he had regained his leg rather than being a cyborg.

• Hugh Herr shared personal hesitations about becoming neurally linked again due to past academic struggles but acknowledged job security at MIT.

Future of Human Enhancement

• Herr envisioned that NeuroEmbodied Design would extend beyond limb replacement into powerful exoskeleton technology controlled by human thoughts.

• He predicted humans could evolve into beings capable of flight through non-anthropomorphic structures like wings by enhancing their physical capabilities.

Conclusion: A Return to Climbing