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Long-term memory for categories and concepts in horses (Equus caballus)
Evelyn B Hanggi1, Jerry F Ingersoll
1Equine Research Foundation, Aptos, CA 95001, USA. EquiResF@aol.com
Animal Cognition
|January 17, 2009
Summary
Horses demonstrate remarkable long-term memory (LTM), retaining cognitive skills like categorization and concept use for up to 10 years. This study highlights their adaptive learning abilities and capacity for generalization.
Area of Science:
- Animal Cognition
- Equine Behavior
- Neuroscience
Background:
- Horses (Equus caballus) possess cognitive abilities including discrimination learning, categorization, and concept use.
- Previous research suggests horses may remember events for extended periods.
Purpose of the Study:
- To evaluate long-term memory (LTM) in horses for cognitive tasks.
- To introduce LCD multi-displays for stimulus presentation in equine cognition research.
Main Methods:
- Three experiments assessed LTM for discrimination learning (6 years), categorization (10 years), and relative size concept (7+ years).
- LCD multi-displays were utilized for stimulus presentation.
- Horses were tested without further training on familiar and novel stimuli.
Main Results:
- Horses showed no significant performance decrement in LTM for discrimination learning on most tasks.
- One horse consistently applied a learned categorization rule to novel stimuli after a 10-year interval.
- Another horse reliably applied a relative size concept after 7+ years.
Conclusions:
- This study provides the first evidence of long-term categorical and conceptual memory in horses.
- Findings support observations of horses remembering ecological events over long durations.
- Horses exhibit adaptive learning and generalization capabilities across diverse conditions.
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