Neurotransmitters are just chemical signals sent between neurons. There’s nothing inherent about any of them that gives them particular properties – it all depends on the neural systems that use a particular neurotransmitter to signal.
Example: pushing down on the gas pedal of a car makes it go faster, pushing down on the brake pedal makes it go slower. Pushing down on a pedal is just a signal, it’s what the pedal is connected to that really matters.
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