i'm trying to translate an english article in french. This article explains some scientific experiments. I have the following sentence:
At the top of our human reward list are food, sex, love, friendship, and novelty. These are called ‘natural reinforcers,’ as contrasted with addictive chemicals.
I understand the second sentence as "These are a natural help, unlike addictive chemical products".
Am i right? I'm not sure how to translate "reinforcers". And, in this case, does "chemicals" refer to articial addictive products (drugs, ...) or does it refer even to chemical substances in the brain, like dopamine?