A theoretically based model of rat personality with implications for welfare

Area of Science:

• Animal Behavior
• Animal Personality
• Animal Welfare

Background:

• Animal personality research is growing, requiring theoretical frameworks for its causes and consequences.
• Regulatory Focus Theory (RFT) models human behavior using promotion (gain approach) and prevention (safety approach) motivations.
• RFT shows promise for explaining nonhuman animal behavior and welfare.

Purpose of the Study:

• To test the applicability of RFT to animal personality and welfare in rats.
• To investigate the relationship between promotion/prevention motivations and chronic stress indicators.
• To explore how manageable threat exposure affects prevention motivation.

Main Methods:

• 60 rats (Rattus norvegicus) navigated an automated maze measuring darkness (prevention) and food reward (promotion) seeking.
• Individual differences in motivation were assessed.
• Physiological stress indicators were measured.
• Half the rats experienced a manageable threat before re-testing.

Main Results:

• Stable individual differences in promotion and prevention behaviors were observed (Ps <0.01).
• Both behaviors were inversely correlated with chronic stress indicators (Ps <0.05), suggesting better welfare.
• Threat exposure increased time spent in darkness (P<0.05), enhancing prevention motivation.

Conclusions:

• RFT provides a viable framework for understanding animal personality and its link to welfare.
• Individual differences in motivation are stable and related to stress levels in rats.
• Manageable threats can enhance prevention motivation, offering insights into adaptive responses.