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Updated: Jun 17, 2026
08:06
Eye Movement Monitoring of Memory
Published on: August 15, 2010
14.7K
Pupil size tracks cue-trace interactions during episodic memory retrieval.
Elizabeth M Siefert1,2, Mingjian He1,3, Elena K Festa1
1Cognitive, Linguistic, and Psychological Sciences, Brown University, Providence, Rhode Island, USA.
Psychophysiology
|August 12, 2023
Summary
Pupil dilation during memory retrieval may reflect how well cues interact with stored memories, not just memory strength. This suggests the locus coeruleus-noradrenergic system aids recognition memory.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Memory Research
Background:
- Episodic memory retrieval involves reactivating stored traces via cues (ecphory).
- The pupillary old/new effect (greater pupil dilation for recognized items) is linked to memory retrieval but its cause is debated.
- Current theories suggest the effect reflects memory trace strength.
Purpose of the Study:
- To test the hypothesis that the pupillary old/new effect reflects cue-trace interaction facilitation during retrieval.
- To investigate the role of the locus coeruleus-noradrenergic (LC-NA) system in this process.
Main Methods:
- Examined the relationship between pupil dilation and cue-trace overlap during recognition memory tasks.
- Assessed how pupil dilation correlates with the reinstatement of study context during retrieval.
Main Results:
- Pupil dilation magnitude was influenced by the degree of overlap between retrieval cues and memory traces.
- Pupil dilation reflected the amount of study contextual information that was reinstated during retrieval.
Conclusions:
- The pupillary old/new effect may not solely indicate memory strength but also the efficiency of cue-trace interactions.
- The LC-NA arousal system might play a crucial role in supporting these interactions during episodic memory retrieval.
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