Scientists have long yearned for a neuron-by-neuron illustration of brain activity; get that and you can see exactly what drives an animals thoughts and reflexes. MIT may make those wishes come true, as it just revealed a system that produces a complete 3D neural activity map. The discovery revolves around a light field microscope (which refracts light to create a 3D image) thats optimized for looking at the electrical pulses of each neuron, right down to the millisecond time level.
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