Pavlov noticed that dogs began salivating at the mere sight of the person who regularly brought food to them. For the dogs,the sight of this person had become a(n)

A) primary reinforcer.
B) unconditional stimulus.
C) immediate reinforcer.
D) conditioned stimulus.

Salivating

The production and release of saliva in the mouth, often in response to the anticipation of food, through a reflex action.

Conditioned Stimulus

A previously neutral stimulus that, after becoming associated with an unconditioned stimulus, eventually triggers a conditioned response.

Sight of Person

The visual perception of another individual by an observer.