Flexible organic circuits that mimic biological neurons could increase processing speed and might someday hook right into your head.
Salleo and other researchers have created electronic devices using these soft organic materials that can act like transistors and memory cells and other basic electronic components.
Conventional digital computers work one step at a time, and their architecture creates a fundamental division between calculation and memory. This division means that ones and zeroes must be shuttled back and forth between locations on the computer processor, creating aThe brain does things differently. An individual neuron receives signals from many other neurons, and all these signals together add up to affect the electrical state of the receiving neuron.
A simple organic memristor, for example, might have two layers of electrically conducting materials. When a voltage is applied, electric current drives positively charged ions from one layer into the other, changing how easily the second layer will conduct electricity the next time it is exposed to an electric current. “It’s a way of letting the physics do the computing,” says, a computer engineer at Arizona State University in Tempe who researches neuromorphic computing.
The technique also liberates the computer from strictly binary values. “When you have classical computer memory, it’s either a zero or a one. We make a memory that could be any value between zero and one. So you can tune it in an analog fashion,” Salleo says.
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