One way this was found out was by vibrating whole frogs while recording the electrical impulses from particular cells in their inner ears that were suspected of responding to seismic stimulation.

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The two researchers realized they could combine forces by creating a bundle of glass tubes, similar to what was being used for DNA analysis, for recording the electrical activity of individual neurons.

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The technology is made possible by commercially available sensors for recording electroencephalograms (EEGs), which are basically the electrical outputs your brain produces while it thinks.

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