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Applying tiny amounts of electricity -- just a few hundred millivolts -- causes the devices to swell or shrink.

In addition, the silicon photoelectrode used 460 millivolts less electrical energy to produce a reaction than one would have using only electricity.

Notably, the electric field was low for all of these experiments, around 200 millivolts per millimeter.

Everything that goes on in there is a result of millivolts zipping from one neuron to another in particular patterns.

The two millivolts in question are those associated with P300, a fleeting electrical signal produced by a human brain which has just recognised an object it has been seeking.