6. Behaviorism: Classical Conditioning
Phenomena in Classical Conditioning
1. Acquisition
‐ Temporal relations in conditioning: Forward (Simultaneous, Delayed, Trace),
and Backward
‐ Pairing schedule: Continuous vs. intermittent
2. Extinction
3. Generalization
4. Discrimination
5. External Inhibition
6. Spontaneous recovery
7. Higher order conditioning
8. Counter‐conditioning – Response substitution
9. Blocking
10. Overshadowing
11. Configuring
What is learnt in classical conditioning?
‐ Association between the CS and US? … Sign learning
‐ Association between the CS and CR? … Stimulus substitution
12. Hull’s theory
D drive
SH R habit strength.
S ER reaction potential = SH R × D
IR reactive inhibition
SIR conditioned inhibition
SĒR effective reaction potential = SH R × D – (IR + SIR)
K incentive motivation
V stimulus intensity
SĒR = SH R × D × K × V – (IR + SIR)
13. Spence’s incentive motivation
For Spence, K was also the energizer of learned behavior. Unlike Hull,
who multiplied K to the basic equation, Spence added K to the equation
as follows:
SĒR = (D + K) × SH R – IN
The major implication of Spence’s revision is that the learned response
may be given in a situation if the incentive is present, even if no drive is
present. Thus, organisms sometimes eat when they are not hungry,
drink when they are not thirsty, simply because they have developed
strong tendencies to perform these acts under certain circumstances. A
person continues to work to accumulate money even though he or she
has more than enough to satisfy his or her basic needs. On the other
hand, the organism would go on making a learned response, even if
there is no incentive for doing so, as long as the drive is present. In fact,
as long as D or K have a value above 0, an organism would make a
learned response if SHR > 0
14. Spence’s theory of extinction
The Frustration‐Competition Theory of Extinction:
In his equations Hull’s symbols for inhibition were IR and SIR and Spence’s
symbol is IN. This reflects a major theoretical difference between Hull
and Spence – concerning the nature of inhibition.
Hull explained reinforcement by saying that when reinforcement is
removed from the situation (K=0), IR and SIR become the dominant
influences and thus the animal stops emitting the learned response. For
Spence non‐reinforcement causes frustration that elicits responses that
are incompatible with the learned response and therefore compete with
it. Eventually behavior stimulated by frustration and anticipation of
frustration becomes dominant, and we say that the learned response
has extinguished. Thus Hull explains extinction on the basis of fatigue (a
bodily process), whereas Spence explains it on the basis of frustration (a
mental process). Experimental tests reveal that Spence’s explanation
fares better.