- Can medical prostheses advance further, and what are their potential risks?
- How do doctors detect cancer in the human body?
- Why do I have to take some medications every four hours but others only once a day?
- Why does our hair turn gray — as opposed to green or some other color — as we age?
- Why can’t machines — or humans — sniff out drugs or explosives as well as dogs?
- Why do our bodies make boogers?
- Must all organisms age and die?
- Can hearts, livers, and kidneys be grown in the lab for human transplants?
- How did life on Earth begin?
- Why do we sweat more in high humidity?
Could I put a computer chip in my brain to make me smarter?
If you feel like your brain could use some assistance with all the thinking, remembering, sensory processing, and bodily function controlling it does, help is on the way…By Peter Dunn
People are already getting assistance from cochlear implants, which convert sound into signals that a deaf person’s brain can understand, and deep brain stimulators, implanted electrodes which offer relief from pain and depression to neurological patients. First-generation on-brain chips, now in advanced development, are expected to add capabilities like seizure prevention and the ability to control wheelchairs or other assistive equipment using brain waves.
Even more remarkable, though less mature, is the prospect of bi-directional interfaces between neurons and computer chips—in essence, adding a “co-processor” to the brain to create new orders of intelligence. “The goal for the next century will be to discover the principles of controlling neural circuits, and to invent new technologies to support these control algorithms,” explains Edward Boyden, Benesse Career Development Professor at the MIT Media Lab and leader of MIT’s Synthetic Neurobiology Group.
There are, of course, numerous practical challenges. An on-brain chip or interface has to be small and bio-compatible, and must not radiate excessive heat or require battery replacement or other maintenance. And they must interact with the brain’s natural “circuitry,” electronically, chemically, or (as in the case of Boyden’s prospective co-processor) optically.
Several MIT groups are addressing aspects of the ongoing engineering effort; Boyden’s team is conducting a worldwide survey of plant, bacteria, and fungus species, seeking natural genes that sensitize neurons to being activated or shut down by light. In this way, using optical fiber arrays, they can control neural computations done by specific cells in the brain, a first step towards being able to close the loop to make functional brain co-processors.
Posted: January 5, 2010