Dopamine is a neurotransmitter that when released in the brain tends to make a person feel happy. Certain drugs stop the synapses from removing neurotransmitters. When these drugs cause an increase in the amount of neurotransmitters in the synapses, which response would be increased?

Dopamine tends to make a person feel happy when it is released in the brain. If a drug stops synapses from removing neurotransmitters, more dopamine can remain in the synapses, increasing the response associated with it: happiness. So the correct choice is happiness.

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