Trait "pessimism" is associated with increased sensitivity to negative feedback in rats

Area of Science:

• Neuroscience
• Cognitive Psychology
• Animal Models

Background:

• Cognitive theories link judgment bias to depression vulnerability.
• Previous research showed pessimistic bias correlates with stress-induced anhedonia and reduced motivation in rats.

Purpose of the Study:

• To investigate the impact of trait pessimism on cognitive processes related to depression.
• To compare the sensitivity of optimistic and pessimistic rats to positive and negative feedback.

Main Methods:

• Rats were trained on a probabilistic reversal-learning (PRL) task to assess feedback sensitivity.
• Ambiguous-cue interpretation (ACI) tests classified rats into optimistic and pessimistic groups.
• Behavioral responses to feedback were analyzed.

Main Results:

• Pessimistic rats exhibited significantly higher sensitivity to negative feedback compared to optimistic rats.
• This heightened sensitivity was evidenced by an increased proportion of lose-shift behaviors in pessimistic rats.
• The findings suggest an interrelation between cognitive biases and vulnerability to depressive disorders.

Conclusions:

• Cognitive biases, specifically judgment bias, are associated with vulnerability to depression.
• Pessimistic traits in rats are linked to increased sensitivity to negative feedback.
• These findings support the co-existence of cognitive biases that may predict depressive disorder vulnerability.