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Investigating a mental effort explanation of the generation effect using pupillometry.
Ania M Grudzien1, Nash Unsworth2
1Department of Psychology, University of Oregon, Eugene, OR, 97403, USA. aniag@uoregon.edu.
Memory & Cognition
|September 4, 2025
Summary
Generating information requires more mental effort than reading it, which improves memory recall. Pupillometry data supports this "mental effort theory" of the generation effect, linking effort to better memory performance.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Human Memory
Background:
- The generation effect describes enhanced memory for self-generated information versus read information.
- The mental effort theory posits that generating information demands greater cognitive resources than passive processing.
- Previous research has explored various explanations for the generation effect, but direct physiological measures of effort have been limited.
Purpose of the Study:
- To investigate the role of mental effort in the generation effect using pupillometry.
- To examine whether increased pupillary response (an indicator of mental effort) correlates with the generation effect.
- To determine if effort allocation mediates the relationship between generation and memory performance.
Main Methods:
- Four paired-associates memory experiments were conducted.
- Pupillometry was employed as an objective measure of mental effort.
- Experiments included within-subjects and between-subjects designs, with manipulations of generation difficulty and a verbal component.
Main Results:
- Generated information consistently elicited a greater pupillary response (higher mental effort) compared to read information across all experiments.
- This increased mental effort was associated with improved memory performance in within-subjects conditions.
- Covariance analysis indicated that differential effort allocation partially explained the behavioral generation effect.
Conclusions:
- Pupillometry data provides physiological evidence supporting the mental effort theory of the generation effect.
- The findings suggest that the cognitive effort invested in generating information is a key factor contributing to its enhanced memorability.
- This research offers a deeper understanding of the mechanisms underlying memory formation and cognitive effort allocation.
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