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- W4214509554 abstract "SUMMARY After having demonstrated that blood-sucking bugs are able to associate a behaviourally neutral odour (l-lactic acid) with positive reinforcement (i.e. appetitive conditioning) in the first part of this study, we tested whether these insects were also able to associate the same odour with a negative reinforcement (i.e. aversive conditioning). Learned aversion to host odours has been repeatedly suggested as a determinant for the distribution of disease vectors among host populations. Nevertheless, no experimental evidence has been obtained so far. Adapting a classical conditioning approach to our haematophagous model, we trained larvae of Rhodnius prolixus to associate l-lactic acid, an odour perceived by bugs but behaviourally neutral when presented alone, with a mechanical perturbation (i.e. negative reinforcement). Naive bugs and bugs exposed to CS, punishment, or CS and punishment without contingency remained indifferent to the presence of an air stream loaded with l-lactic acid (random orientation on a locomotion compensator), whereas the groups previously exposed to the contingency CS–punishment were significantly repelled by l-lactic acid. In a companion paper, the opposite, i.e. attraction, was induced in bugs exposed to the contingency of the same odour with a positive reinforcement. These constitute the first pieces of evidence of olfactory conditioning in triatomine bugs and the first demonstration that the same host odour can be used by insects that are disease vectors to learn to recognize either a host to feed on or a potentially defensive one. The orientation mechanism during repulsion is also discussed in light of our results." @default.
- W4214509554 created "2022-03-02" @default.
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- W4214509554 date "2011-09-15" @default.
- W4214509554 modified "2023-09-30" @default.
- W4214509554 title "Learning the way to blood: first evidence of dual olfactory conditioning in a blood-sucking insect, <i>Rhodnius prolixus</i>. II. Aversive learning" @default.
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- W4214509554 doi "https://doi.org/10.1242/jeb.057075" @default.
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