Now, if you stick an electrode in a nucleus called RA, which is a descending motor nucleus which projects to the nuclei that controls the syrinx, the vocal organ what you're gonna record when the animal sings, are action potentials from a given neuron that are very stereotyped, so if the animal sings a hundred times, this neuron will fire always for the first syilable with three bursts, and then will be silent for the second syilable then is gonna fire bursts here at the beggining of third syilable and then again and again so there's a signature, each neuron has a particular pattern of activation, a specific moment with regards to what's going on in terms of behavior now what is really cool, and this is a work done in Chicago, in Margoulish's lab is what happens when the animal is asleep, this is what happens so you can see here, with no mathematical tricks, that the pattern that the neuron had the firing pattern that relates to singing reoccurs with very small changes during sleep so you could almost say, well I can now confirm that the animal was somehow dreaming of this very important behavior which is the birds own song, OK? 