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Updated: Feb 28, 2026
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An Olfactory Preference Test for Measuring Olfactory Hedonic Biases in Mouse Models of Depression
Published on: July 11, 2025
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Comparing affective bias modification by first- and second-generation antidepressants in male rats using a
Katie A Kamenish1, Emma N Cahill1, Emma S J Robinson2
1University of Bristol, School of Physiology, Pharmacology and Neuroscience, Bristol, UK.
Summary
Antidepressants like amitriptyline and sertraline positively bias learning and modulate negative memories in rats. Moclobemide only affected new learning, showing distinct antidepressant mechanisms for affective biases.
Area of Science:
- Neuroscience
- Psychopharmacology
- Behavioral Science
Background:
- Negative affective biases are linked to major depressive disorder.
- Antidepressant efficacy may involve direct modulation of these biases.
- Conventional antidepressants can positively influence emotional processing.
Purpose of the Study:
- Compare first-generation (amitriptyline) versus second-generation (moclobemide, sertraline) antidepressants.
- Investigate modulation of affective biases in new learning and past experiences.
- Utilize a validated rat model for affective bias assessment.
Main Methods:
- Dose-response experiments with amitriptyline, moclobemide, and sertraline in rats.
- Assessed affective biases in new associative learning and memory recall.
- Administered treatments acutely (1h) and sub-acutely (24h) before testing.
Main Results:
- All tested antidepressants (amitriptyline, moclobemide, sertraline) positively biased new learning.
- Amitriptyline and sertraline attenuated negatively biased memories at both 1h and 24h.
- Moclobemide did not affect modulation of past experiences; no drugs affected control reward learning.
Conclusions:
- Pharmacological profiles of antidepressants differ in their effects on affective biases.
- Distinct modulation of learning versus memory suggests varied mechanisms of action.
- Understanding these neuropsychological differences may enhance clinical antidepressant use and outcomes.
