Fig. 6. Test for savings of extinction memory during reinstatement in control and cocaine-exposed snails. After operant conditioning, animals were exposed to extinction training but no pneumostome stimulus was administered (shown by ovals E1, 2 and 3; no data indicated). Testing for extinction memory was conducted during the Test for Savings 2 h after the last extinction training session, and this Test for Savings session is shown for the same animals as those used for the data in Fig. 5. (A) Control and (B) 0.1 µmol l^-1 cocaine treated. Values are mean ± s.e.m. for number of pneumostome openings. Animals treated with 0.1 µmol l^-1 cocaine did not meet the requirements for extinction memory during reinstatement. Snails pretreated with 0.1 µmol l^-1 cocaine showed a significant reduction in the number of pneumostome openings on the Test for Savings compared with the Memory Test. Training session 1; 2, Training session 2; MT, Memory Test; TS^*P<0.05 compared with MT within the same treatment group.