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Long-term memory of relative reward values
Francesca Soldati1, Oliver H P Burman1, Elizabeth A John1
1School of life Sciences, University of Lincoln, Lincoln LN6 7DL, UK.
Biology Letters
|February 3, 2017
Summary
Red-footed tortoises demonstrate long-term memory, retaining learned associations between visual cues and food rewards for at least 18 months. This adaptive memory influences foraging decisions and ecological interactions.
Area of Science:
- Animal Behavior
- Cognitive Ecology
- Neuroscience
Background:
- Long-term memory aids survival by retaining crucial information about resources.
- Assessing relative resource value is vital, but retention over time is poorly understood.
- Natural foraging involves complex choices, unlike simplified lab comparisons.
Purpose of the Study:
- To investigate if tortoises can retain learned associations of food reward values over an extended period.
- To determine the duration of memory for relative quantity and quality of food resources.
Main Methods:
- Captive red-footed tortoises (Chelonoidis carbonaria) were trained to link visual cues with specific food rewards.
- Initial preference tests established baseline reward value associations.
- Tortoises were retested after an 18-month interval to assess memory retention.
Main Results:
- Tortoises successfully retained learned information about visual cues as indicators of relative food reward values.
- Memory for relative quantity and quality of food was preserved over the 18-month period.
- This demonstrates a significant long-term memory capability in this species.
Conclusions:
- Red-footed tortoises possess long-term memory for learned resource values.
- This memory likely influences foraging strategies and resource exploitation.
- Findings have implications for understanding animal ecology, including herbivory and seed dispersal.
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