Effect of crowding on long-term memory formation.

Number of average (± SEM) pneumostome openings in 30 min during training (TR) and the test for LTM 24 h later (test @ 24 h) in the CM (Chilton Moor) and TC1 (Trans Canada 1) populations following crowding (CR: 20 snails/100 ml) for 1 h immediately prior to training. There was no significant decline in pneumostome opening attempts between TR and the test at 24 h following crowding prior to TR.