This person is either David Hubel or Torsten Wiesel and has an anesthetized cat with it's eyes pointed toward this screen. An electrode is placed in the occipital cortex in the first part of the neocortex that receives visual information from the eyes via the thalamus. This electrode picks up the electrical signal of an action potential, which signifies the information that a particular neuron in this area is passing on to other neurons.
Here are more cool videos: http://www.youtube.com/watch?v=VPQAtkxn3tY&feature=related
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