What term describes a stimulus that naturally triggers an automatic response without prior learning?

What term describes a stimulus that naturally triggers an automatic response without prior learning?

• A. Unconditioned Stimulus
• B. Unconditioned Response
• C. Stimulus Control
• D. Shaping

Answer: (A)

A natural trigger that causes an automatic response without learning is the unconditioned stimulus. It elicits an unconditioned response—the reflexive reaction that happens without prior training. For example, in Pavlov’s classic study, the meat powder is the unconditioned stimulus because it reliably causes the dog to salivate on its own. If a neutral cue, like a bell, is paired with the food repeatedly, that cue can become a conditioned stimulus that later elicits salivation even without food. The unconditioned response is the salivation itself, not the trigger. Stimulus control refers to how stimuli influence behaviors through reinforcement, and shaping is a procedure for gradually guiding behavior toward a goal, not a type of trigger.

A natural trigger that causes an automatic response without learning is the unconditioned stimulus. It elicits an unconditioned response—the reflexive reaction that happens without prior training. For example, in Pavlov’s classic study, the meat powder is the unconditioned stimulus because it reliably causes the dog to salivate on its own. If a neutral cue, like a bell, is paired with the food repeatedly, that cue can become a conditioned stimulus that later elicits salivation even without food. The unconditioned response is the salivation itself, not the trigger. Stimulus control refers to how stimuli influence behaviors through reinforcement, and shaping is a procedure for gradually guiding behavior toward a goal, not a type of trigger.