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Behavioral Approaches to Studying Innate Stress in Zebrafish
Published on: May 1, 2019
Flies cope with uncontrollable stress by learned helplessness
Zhenghong Yang1, Franco Bertolucci, Reinhard Wolf
1Rudolf-Virchow-Center, Joseph-Schneider-Strasse 2, 97080 Würzburg, Germany.
Current Biology : CB
|April 23, 2013
Summary
Researchers studied learned helplessness in fruit flies, finding it has cognitive and mood-like components. Flies stop responding when their actions have no effect, exhibiting "depressed" behaviors like slower walking and more rests.
Area of Science:
- Behavioral Neuroscience
- Animal Behavior
- Neurobiology
Background:
- Learned helplessness is a condition induced by uncontrollable stress in animals.
- In mammals, it's linked to depression symptoms and brain serotonin changes.
- It serves as a key animal model for human depression.
Purpose of the Study:
- Investigate learned helplessness in Drosophila (fruit flies).
- Determine if this state has cognitive and modulatory (mood-like) components.
- Analyze the behavioral organization based on expected consequences.
Main Methods:
- Exposing Drosophila to a heat stimulus contingent on their walking behavior.
- Manipulating the control flies had over the heat stimulus.
- Observing and quantifying changes in walking speed, rest duration, and frequency.
Main Results:
- Flies develop learned helplessness when their behavior fails to control the heat stimulus.
- This state is characterized by slower walking and increased resting, resembling "depressive" behaviors.
- Behavioral downregulation was more pronounced in female flies compared to males.
Conclusions:
- Drosophila exhibits a two-component learned helplessness: cognitive and modulatory.
- This insect model provides insights into the neurobiological underpinnings of learned helplessness.
- Behavioral responses are organized by the organism's expectation of consequences.
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