Practice

Learning: classical, instrumental and observational

Question 1 of 12

A conditioning experiment with rats

A researcher runs three groups of rats. All groups receive the same number of shocks in Phase 2, and all are tested the same way: a tone is presented alone and the researcher measures how much the rats suppress lever pressing for food (greater suppression = more fear).

Group	Phase 1	Phase 2	Test: suppression to tone alone
A	Light → shock (16 trials)	Light + tone → shock (8 trials)	Low
B	No training	Light + tone → shock (8 trials)	High
C	Light alone, no shock (16 trials)	Light + tone → shock (8 trials)	High

The low suppression to the tone in Group A, compared with Group B, is an example of