What does US stand for?

Via imaging technique, researchers could see that some neurons were activated by the saccharine, or the conditioned stimulus, and the lithium chloride or the unconditioned stimulus activated others.

bell), previously paired with an unconditioned stimulus (e.

Underlying Process The mechanism of action in alarm treatment was initially described as classical conditioning, with the alarm as the unconditioned stimulus, bladder distention as the conditioned stimulus, and waking as the conditioned response (Mowrer & Mowrer, 1938).

Rather than refer to this interference procedure as extinction-like, which implies both a conditioned stimulus (CS) and an unconditioned stimulus (US) and a traditional Pavlovian paradigm--features clearly absent in this type of learning--we use the term elemental interference instead.

The odor, as the conditioned stimulus, then becomes associated with the irritative symptoms of glutaraldehyde, the unconditioned stimulus.

Many studies have shown that exposure to foot shock results in flight or fleeing reactions (Bolles & Fanselow, 1980), whereas rats typically engage in fear-motivated freezing as a defensive conditioned response when a discrete stimulus or the experimental context has been paired with shock as an unconditioned stimulus (Fanselow & Baackes, 1982; Fanselow, Sigmundi, & Williams, 1987).

Acquisition of Pavlovian conditioned responding is deterred when the unconditioned stimulus (US) is presented in both the presence and absence of the conditioned stimulus (CS), compared with conditions in which each US is preceded by the CS.

nonsense syllables) in various sequences, whereas a typical respondent conditioning experiment presents one or two conditioned stimuli and an unconditioned stimulus.