Look carefully at the graph provided: Strong
Acquisition
INSUS)
Spontaneous
recovery of CR
Extinction
Catone)
Strength
of CR
Extinction
Salon)
Weak
Pause
Time
Figure 26.6
Myers Dewall Myers' Asychology for the AP Course. Be 2018 Worth Publishers
In Pavlov's experiment, which part of the graph shows the initial effect of a repeated tone without the presentation of food?
Acquisition (NS + US)
O 1st Extinction (CS alone)
O Pause
Spontaneous recovery of CR
O 2nd Extinction (CS alone)

B) 1st Extinction (CS alone)

Explanation:

Unconditioned stimulus: food

Neutral/Conditional Stimulus: tone

Unconditioned Response: salivation

Conditioned response: salivation in response to tone

With the 1st Extinction, the conditional stimulus (CS), tone, is presented alone without the food for the first time. Many may choose A (Acquisition (NS + US), howver it is incorrect because the food is still present (US), which is not what the question is asking. Rather, we seek to determine the first instance in which the tone is repeated but food is not present. As such, B) 1st Extinction (CS alone) is the correct answer.