They inserted a small electrode in the brain of the rat. The rat had access to a lever that was connected to the electric supply of the electrode. Every time the rat pressed on the lever, there was a low voltage current that would stimulate the reward center and therefore the rat was reinforced to press the lever again and again. This is the way through which the researchers got to know more about the neuromechanics of reinforcement.

When neuromechanics were studied specifically with respect to the learning curves in animals, like monkeys, it was noted that at the beginning of learning the release of dopamine is greater. As the period of learning proceeds, the learning curve declines along with the decline in the production of dopamine. The researchers, during this experiment, also suggested that different reinforces should be given to the animals in which one wants to improve learning....
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