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The Journal of Experimental Biology 205, 1171-1178 (2002)
© 2002 The Company of Biologists Limited

The effects of continuous versus partial reinforcement schedules on associative learning, memory and extinction in Lymnaea stagnalis

Susan Sangha^*, Chloe McComb^*, Andi Scheibenstock, Christine Johannes and Ken Lukowiak

Department of Physiology and Biophysics, University of Calgary, Faculty of Medicine, 3330 Hospital Drive NW, Calgary, Alberta, Canada T2N 4N1
^* Contributed equally to this study

Author for correspondence (e-mail: lukowiak{at}acs.ucalgary.ca )

Accepted 1 February 2002

A continuous schedule of reinforcement (CR) in an operant conditioning procedure results in the acquisition of associative learning and the formation of long-term memory. A 50 % partial reinforcement (PR) schedule does not result in learning. The sequence of PR—CR training has different and significant effects on memory retention and resistance to extinction. A CR/PR schedule results in a longer-lasting memory than a PR/CR schedule. Moreover, the memory produced by the CR/PR schedule is resistant to extinction training. In contrast, extinction occurs following the PR/CR schedule.

Key words: operant conditioning, partial reinforcement, extinction, long-term memory, Lymnaea stagnalis

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