BTW, in a later experiment, they tested the brains internal clock by training rats to push a button every 12 seconds.

All rats could repeatedly push the button, every 12 seconds spot on. They gave one cocaine, and the other marijuana. The cocaine rat pressed it every 8 seconds. The marijuana rat pressed it every 18 seconds. The control rat continued to press it every 12 seconds.

Later they gave the third rat crack. He escaped, took the scientist's car and credit cards and was found in a crack house a block away.

Ok I added the last part lol.