NDLI: Humidity as an aversive stimulus in learning inDrosophila melanogaster

Content Provider	Springer Nature Link
Author	Bourg, Éric
Copyright Year	2005
Abstract	The learned suppression of photopositive tendencies was studied at the individual level in young flies of both sexes. In a T-maze, flies had to choose between an arm leading to a lighted vial associated with an aversive stimulus (i.e., a solution of quinine chlorhydrate deposited on a filter paper in the vial) and another arm leading to a darkened vial free of quinine. The present experiments were carried out to determine the roles of quinine and relative humidity in the maze. The flies avoided the lighted vial containing quinine even if they had no tarsal contact with quinine, and this result was not due to any odor of quinine. Subsequent experiments showed that relative humidity in the lighted vial, and probably in the arm leading to it, was an aversive stimulus, which partly explains why the flies avoided the lighted vial. However, in conditions in which the flies had tarsal contact with water or quinine it was confirmed that flies trained with quinine have higher avoidance scores than those trained with water only. Moreover, individual aversion to humidity was not correlated with the individual avoidance score: At similar levels of motivation (i.e., similar levels of aversion to humidity), some flies learn to avoid the lighted vial containing quinine whereas others do not. All these results show that, in addition to quinine, humidity is an unconditioned aversive stimulus in our paradigm and thus needs to be tightly controlled in experiments of conditioned avoidance.
Starting Page	265
Ending Page	276
Page Count	12
File Format	PDF
ISSN	15434494
Journal	Learning & Behavior
Volume Number	33
Issue Number	3
e-ISSN	15434508
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Psychology Neurosciences
Content Type	Text
Resource Type	Article
Subject	Experimental and Cognitive Psychology Cognitive Neuroscience Behavioral Neuroscience

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