Introductory Concepts
Elementary Relationships
Extensions of Verbal Behavior
Multiple Controlling Relationships
Building on the Elementary Relationships
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1.5 Definition of Discriminative Stimulus

The next term is discriminative stimulus, which is a stimulus in the presence of which a given response has a history of being reinforced. For example, if a hungry lab rat receives a pellet (reinforcement) for pressing a bar only when a red light is on, the red light is probably functioning as a discriminative stimulus.

TermDefinition
StimulusA physical energy change capable of affecting an organism through one of its receptors: photoreceptors, phonoreceptors, chemoreceptors (gustatory and olfactory), mechanoreceptors (touch), thermoreceptors, and free nerve endings. 
Discriminative StimulusA stimulus in the presence of which a given response has a history of being reinforced.      
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Reinforcement reinforces a behavior, while punishment aims to get rid of that behavior.

discriminative stimulus always has a history of being reinforced

It’s such an excellent way to caption this.

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