Note that with an US of food, you can think of the UR is several ways. It could be salivation, insulin release, gastric changes , etc. associated with the body getting ready to eat. These responses can also cause hunger, which facilitates eating as much as you can. So the UR could also be hunger . On the other hand, food and any other appetitive stimuli can produce approach behaviour . This goes along with a behaviour systems approach, where stimuli release a subset of behaviours. In general…
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