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Associative olfactory learning in the moth Manduca sexta.

K C Daly1, B H Smith

  • 1Department of Entomology, Ohio State University, Columbus 43210-1220, USA. daly.40@osu.edu

The Journal of Experimental Biology
|June 14, 2000
PubMed
Summary
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Researchers studied olfactory learning in the moth Manduca sexta using a feeding reflex. They found that moths learn to associate odors with sucrose when presented together, demonstrating associative learning.

Area of Science:

  • Insect behavior
  • Neuroethology
  • Olfactory learning

Background:

  • The proboscis extension response (PER) is a common method for studying insect olfactory learning.
  • Alternative behavioral assays are needed to broaden the understanding of insect associative learning.

Purpose of the Study:

  • To investigate olfactory associative learning in the moth Manduca sexta using a cibarial pump reflex.
  • To compare learning acquisition and retention under different associative conditioning protocols.

Main Methods:

  • Moths (Manduca sexta) were subjected to Pavlovian conditioning with odor and sucrose pairings.
  • Different pairing orders (forward, backward, random) and control conditions were tested.
  • Discrimination learning was assessed using two odors, one paired with sucrose and the other presented alone.

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Main Results:

  • An excitatory cibarial pump response, indicating learning, was observed only when odor was forward-paired with sucrose.
  • This learned response persisted for at least 24 hours.
  • Backward and random pairings did not initially elicit a response, but forward pairing on a subsequent day did, with random pairing suggesting possible inhibition.

Conclusions:

  • The cibarial pump reflex in Manduca sexta serves as a valid measure of olfactory associative learning.
  • The findings support the importance of forward-odor-sucrose pairing for robust associative learning in insects.
  • This study contributes to a comparative understanding of learning mechanisms across insect species.