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Updated: Feb 26, 2026

An Electrophysiology Protocol to Measure Reward Anticipation and Processing in Children
Published on: October 4, 2018
Young children do not require perceptual-motor feedback to solve Aesop's Fable tasks
Rachael Miller1, Sarah A Jelbert1, Elsa Loissel1
1Department of Psychology, University of Cambridge, Cambridge, United Kingdom.
Children can understand water displacement without visual feedback. This study shows that even young children can solve water displacement problems by mentally simulating outcomes, not just through trial and error.
Area of Science:
- Cognitive Development
- Comparative Psychology
- Physics Education
Background:
- The Aesop's Fable task assesses causal understanding of water displacement.
- Previous studies suggest success may rely on perceptual-motor feedback.
- Alternative explanations for task success require further investigation.
Purpose of the Study:
- To investigate causal understanding of water displacement without perceptual-motor feedback.
- To assess if children can solve water displacement tasks when visual feedback is removed.
- To introduce a novel, forced-choice paradigm for studying water displacement understanding.
Main Methods:
- A forced-choice Aesop's Fable task was developed, concealing water level changes.
- Fifty-five children aged 5-9 years were tested in six conditions.
- Conditions varied object properties, water level, and tube size.
Main Results:
- Eight- and 9-year-old children solved most tasks on the first trial without feedback.
- Younger children (5-7 years) solved simpler conditions initially and learned others over trials.
- Performance patterns mirrored those in standard Aesop's Fable tasks, indicating no reliance on feedback.
Conclusions:
- Children do not require perceptual-motor feedback to understand water displacement.
- Mental simulation plays a key role in solving these tasks.
- The forced-choice paradigm is suitable for comparative studies, including non-human animals.
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