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Related Experiment Video

Updated: Feb 11, 2026

Novel Object Recognition Test for the Investigation of Learning and Memory in Mice

Novel Object Recognition Test for the Investigation of Learning and Memory in Mice

Published on: August 30, 2017

Association between pupil dilation and implicit processing prior to object recognition via insight.

Yuta Suzuki¹, Tetsuto Minami^2,3, Shigeki Nakauchi¹

¹Department of Computer Science and Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka Tempaku, Toyohashi, Aichi, 441-8580, Japan.

Scientific Reports

|May 4, 2018

Summary

Pupil dilation reflects unconscious processing during insight recognition, linking visual processing and memory integration. This may involve the locus coeruleus-noradrenergic (LC-NA) system, even without conscious awareness.

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Last Updated: Feb 11, 2026

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Area of Science:

Cognitive Neuroscience
Neuroimaging
Visual Perception

Background:

Insight involves sudden understanding after unconscious processing.
Understanding the neural basis of insight recognition is crucial.
Pupil dilation is a physiological measure linked to cognitive processes.

Purpose of the Study:

Investigate implicit neural mechanisms of insight-based recognition.
Determine the association between these mechanisms and pupil dilation.
Explore the role of the locus coeruleus-noradrenergic (LC-NA) system.

Main Methods:

Participants viewed ambiguous, transforming dot images.
Assessed object recognition and confidence levels.
Monitored changes in pupil dilation.

Main Results:

Pupil dilation correlated with recognition of ambiguous objects.
Pupil dilation was associated with prior awareness, irrespective of confidence.
This association suggests implicit memory-visual processing integration.

Conclusions:

Pupil dilation may indicate implicit integration of memory and visual processing.
This integration can occur without conscious object awareness.
The locus coeruleus-noradrenergic (LC-NA) system might mediate this process.