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Related Experiment Video

Updated: Jun 27, 2026

Eye Movements in Visual Duration Perception: Disentangling Stimulus from Time in Predecisional Processes

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Published on: January 19, 2024

Limits on introspection: distorted subjective time during the dual-task bottleneck.

Guido Corallo¹, Jérôme Sackur, Stanislas Dehaene

¹Integrative Neuroscience Laboratory, Physics Department, University of Buenos Aires, Buenos Aires, Argentina.

Psychological Science

|December 17, 2008

Summary

Conscious reportability has limits. New research shows introspective time estimates accurately reflect objective task times, but only when central processing resources are available.

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Area of Science:

Cognitive Psychology
Neuroscience
Psychophysics

Background:

Understanding the limits of conscious awareness is crucial for cognitive science.
Investigating the accuracy of subjective time perception in relation to objective task performance is an ongoing challenge.

Purpose of the Study:

To develop and validate a novel method for quantifying introspection.
To explore the relationship between subjective time estimates and objective response times under varying cognitive loads.
To determine the extent to which conscious reportability reflects underlying cognitive processes.

Main Methods:

Developed a quantified introspection method asking subjects to estimate trial completion times.
Applied mental-chronometry techniques, including the additive-factors method, to analyze introspective data.
Utilized a psychological refractory period task to induce cognitive interference.

Main Results:

Introspective time estimates strongly correlated with objective response times in single-task conditions.
Objective processing delays due to task interference were not reflected in introspective time estimates.
Subjective time perception appears linked to the availability of central processing resources.

Conclusions:

Quantified introspection can be a sensitive measure of cognitive processing, correlating with objective performance.
Conscious reportability of task duration is limited when central processing resources are occupied by concurrent tasks.
Introspective time estimates may serve as an indirect measure of central processing resource availability.