Variable that is manipulated, changed, or controlled in an experiment.

Variable that is manipulated, changed, or controlled in an experiment.

• A. Independent Variable
• B. Negative Reinforcer
• C. Discriminative Stimulus (SD)
• D. Positive Reinforcer

Answer: (A)

The key idea is the variable that researchers deliberately change to see if it causes a difference in the outcome. This is the independent variable. By varying this factor while keeping everything else constant, any observed change in the dependent variable—the behavior or outcome you measure—can be attributed to that manipulation. In behavior analysis, you might manipulate things like the amount of reinforcement or the presence of a stimulus to see how behavior changes. The other terms refer to specific consequences or cues in conditioning, not the thing you actively change to test its effect. A negative reinforcer is something that is removed or avoided to increase a behavior; a positive reinforcer is something added to increase a behavior; a discriminative stimulus is a cue signaling when reinforcement is available. They describe how reinforcement or signals influence behavior, rather than what you modify as the experimental variable.

The key idea is the variable that researchers deliberately change to see if it causes a difference in the outcome. This is the independent variable. By varying this factor while keeping everything else constant, any observed change in the dependent variable—the behavior or outcome you measure—can be attributed to that manipulation. In behavior analysis, you might manipulate things like the amount of reinforcement or the presence of a stimulus to see how behavior changes.

The other terms refer to specific consequences or cues in conditioning, not the thing you actively change to test its effect. A negative reinforcer is something that is removed or avoided to increase a behavior; a positive reinforcer is something added to increase a behavior; a discriminative stimulus is a cue signaling when reinforcement is available. They describe how reinforcement or signals influence behavior, rather than what you modify as the experimental variable.