Abstract
Effect of ECS on memory retention was studied in Octopus vulgaris. Two methods of training were used. 1. Animals trained in a shuttle-box to swim from a dark to a light compartment and to remain there during 25 sec to avoid electroshock, were given 20 learning trials on Day 1 and 10 retention trials 3 days later. No improvement in the performance occurred concerning anticipatory runs to the light compartment but a significant decrease in the number of returns to the dark compartment (incorrect crossings) during Day 1 was recorded. ECS within 1 min after trial 20 caused significant deficits in retention. 2. Animals that previously had been learnt to attack a vertical rectangle moved up and down, were given 30 trials during which if octopuses attacked the shape they would now receive a shock. 15 retention trials were run 2 days later. ECS within 1 min after trial 30 caused significant deficit in retention.
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