Mr. Koch
AP Psychology
Forest Lake High School

Ivan Pavlov
1849-1936
• Russian physician/ neurophysiologist
• Studied digestive secretion
– Accidentally discovered
Classical Conditioning

Classical Conditioning
• Unconditioned Stimulus (UCS)
– Stimulus which causes an automatic unlearned response
• The food
• Unconditioned Response (UCR)
– Unlearned behavior of an organism which occurs naturally as a result of stimulation
• Salivation when food is in mouth

Classical Conditioning
• Acquisition
– The initial stage of learning
• In classical conditioning, the phase associating a neutral stimulus with an unconditioned stimulus

Classical Conditioning
• Conditioned Stimulus (CS)
– Being paired with a stimulus that causes a response this will eventually cause a similar response
– Starts as a Neutral Stimulus (NS) before pairing
• Tone of a bell/tuning fork
• Conditioned Response (CR)
– The behavior of an organism when a conditioned stimulus is presented after the CS has been paired with a UCS
• Salivation

Classical Conditioning

Classical Conditioning
• Classical Conditioning
– Learning situation in which a response is caused by a certain stimulus because the stimulus was combined for a number of trials with a stimulus which normally causes the response
• Also called respondent conditioning

Classical Conditioning
UCS
(passionate kiss) UCR
(sexual arousal)
CS
(onion breath)
UCS
(passionate
Kiss)
CS
(onion breath)
UCR
(sexual arousal)
CR
(sexual arousal)

Classical Conditioning
UCS
(drug)
UCR
(nausea)
CS
(waiting room)
UCS
(drug)
UCR
(nausea)
CS
(waiting room) CR
(nausea)

Classical Conditioning
What would happen if UCS stopped being paired with CS? (i.e. rang bell and gave dog no food?)
• Extinction
– The elimination of the conditioned response by presenting the CS without the UCS

Classical Conditioning
What if you then allowed time to pass before presenting the CS again?
• Spontaneous Recovery
– The recovery of the response to a particular stimulus after extinction and the passage of time

Strength of CR
Acquisition
(CS+UCS)
Extinction
(CS alone)
Spontaneous recovery of
CR
Extinction
(CS alone)
Pause

Behaviorism
• John B. Watson
– Viewed psychology as objective science
– Recommended study of behavior without reference to unobservable mental processes

“Give me a dozen healthy infants, well-formed, and my own specified world to bring them up in and I’ll guarantee to take any one at random and train him to become any type of specialist I might select – doctor, lawyer, artist, merchantchief, and, yes, even beggarman and thief, regardless of his talents, penchants, tendencies, abilities, vocations, and race of his ancestors.”
- John B. Watson

Classical Conditioning
• Generalization
– Subject reacts to a class of stimuli similar to the original CS
“Little Albert” experiment
(Watson and Rosalie Rayner)

Classical Conditioning
• Discrimination
– Subject learns to respond to a particular stimulus
(ability to distinguish between a CS and other stimuli)

Classical Conditioning
• Taste Aversion
• John Garcia
– Can learn association between taste and nausea even hours after eating
• Adaptive for survival
• Challenged idea that pairing must be immediate
– Examples:
» Problems for chemotherapy patients
» Mr. Koch’s dad & chocolate milk
» Binge drinkers and tequila
» Nausea-inducing drugs & alcohol