How artificial retinas could cure blindness | Dante Muratore | TEDxRoma

Artificial Retina and the Future of Brain-Computer Interfaces

Key Concepts:

• Artificial Retina: A brain-computer interface designed to restore vision by electrically stimulating the retina.
• Neural Code: The pattern of electrical signals neurons use to communicate information.
• On-type and Off-type Neurons: Two types of retinal neurons that respond to increases and decreases in light, respectively.
• Brain-Computer Interface (BCI): A technology that allows direct communication between the brain and an external device.
• Microelectronics: The design and fabrication of miniature electronic circuits and components.

The Problem: Vision Loss and the Retina

• Vision loss due to diseases like macular degeneration and retinitis pigmentosa disconnects patients from their surroundings and creates an economic burden.
• These diseases damage the retina, the neural tissue at the back of the eye that converts light into electrical signals the brain can understand.
• The damaged retina can no longer communicate with the brain, leading to blindness.

The Solution: Artificial Retina

• The artificial retina aims to electrically stimulate the retina to generate an artificial neural code and restore vision.
• The challenge is to reproduce the natural neural code as closely as possible.
• Scientists have studied the retina for decades and understand how it works, providing knowledge of the natural neural code for various images.

The Complexity: Replicating the Retina's Functionality

• The retina is a complex, layered structure with different neuron types performing various functions.
• Example: On-type neurons signal when light increases, while off-type neurons signal when light decreases.
• Artificial stimulation must respect this specificity to avoid sending confusing signals to the brain (e.g., stimulating on-type and off-type neurons simultaneously).
• The speaker uses the analogy of an orchestra, where each neuron is a musician and each neuron type is a different instrument. To create music (vision), each instrument (neuron) must play the correct note (signal) at the right time.

The Technology: Microelectronics as the Orchestra Director

• Microelectronics is the "orchestra director," providing the technology to tell the retina which "note" to play and when.
• The speaker's team at Delft University of Technology has been developing an artificial retina device for the past 10 years.
• The device is a few millimeters square and contains thousands of electrodes, each thinner than a strand of hair, and a powerful control chip.
• It communicates wirelessly with a computer and camera mounted on glasses.

The Process: Calibration and Runtime

• Calibration: The device learns which neuron types and individual neurons are near the electrodes and how to stimulate each neuron. This step is about learning how to tell the retina to play all the different notes that are needed.
• Runtime: The device uses the learned information to take an image with the camera and determine how much current to pass through each electrode to activate specific neurons. This recreates the natural neural code with high fidelity, sending the correct information to the brain.

The Challenge: Miniaturization

• Neuroscientist collaborators at Stanford University can already achieve similar results using a room full of equipment.
• The challenge is to reduce the size of this experimental setup by a factor of 10 to the power of 9 (a billion times) to fit it inside the human eye.
• Microelectronics enables packing all the necessary functionality into a tiny chip.

The Future: Potential and Risks

• Successful high-fidelity artificial vision could improve the quality of life for millions of people worldwide.
• Reproducing the natural neural code could create a representation of the outside world that matches reality.
• Risk: The technology could be misused to create fake representations of reality, making deep fakes seem insignificant.
• Example: The speaker references a "Black Mirror" episode where the military implanted chips in soldiers to make them see enemies as monsters.

Beyond Vision: Broader Applications of BCIs

• The speaker is optimistic that technology will be used for good.
• Reproducing the natural neural code in the brain could help patients with neurological disorders like Parkinson's disease, epilepsy, and dementia.

Conclusion: The Transformative Power of BCIs

• Technology has been getting closer to us, and brain-computer interfaces will be even closer, blurring the line between humans and robots.
• Brain-computer interfaces will be even bigger than artificial intelligence because they will change what it means to be humans.
• The speaker poses the question: "How should we use our most transformative technology?"
• The speaker encourages everyone to be aware of the use we want to make of technology and to influence its future developments to ensure a positive impact on our lives.