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Journal of Neuroscience, Vol 14, 68-74, Copyright © 1994 by Society for Neuroscience
Memory through metamorphosis in normal and mutant Drosophila
T Tully, V Cambiazo and L Kruse
Department of Biology, Brandeis University, Waltham, Massachusetts 02254.
To establish that a stable, long-lasting form of memory exists in
Drosophila, we trained third-instar larvae by electroshocking them in the
presence of a specific odor using a Pavlovian conditioning procedure. We
show that conditioned odor avoidance produced in larvae still was present
in adults 8 d later. Such memory through metamorphosis was specific to the
temporal pairing of odor and shock; presentations of odors alone or shock
alone did not produce a change. Thus, the memory involved associative
processes. We also show that similar training of the single-gene memory
mutants dunce and amnesiac did not yield any detectable learning in larvae
or memory retention in adults, suggesting that these mutations interfere
with long-term memory (LTM) formation even if LTM is induced independently
of earlier memory retention processes.
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