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Related Experiment Video

Updated: Feb 4, 2026

Pupillary Response as Assessment of Effective Seizure Induction by Electroconvulsive Therapy

Pupillary Response as Assessment of Effective Seizure Induction by Electroconvulsive Therapy

Published on: April 11, 2019

The human task-evoked pupillary response function is linear: Implications for baseline response scaling in

Jamie Reilly^1,2, Alexandra Kelly^3,4, Seung Hwan Kim⁵

¹Eleanor M. Saffran Center for Cognitive Neuroscience, Temple University, Philadelphia, PA, USA. reillyj@temple.edu.

Behavior Research Methods

|September 29, 2018

Summary

The task-evoked pupillary response (TEPR) scales linearly, not nonlinearly, regardless of baseline pupil size. This finding clarifies cognitive pupillometry methods and suggests reevaluating past studies.

Keywords:

Arousal Cognitive load Executive functioning Psychophysics Pupillometry

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Published on: January 6, 2023

Area of Science:

Cognitive Neuroscience
Psychophysiology
Human Physiology

Background:

The task-evoked pupillary response (TEPR) is a sensitive physiological measure of cognitive load.
Accurate TEPR measurement requires correcting for baseline pupil diameter variability.
Current baseline correction methods in pupillometry yield disparate results, creating a methodological paradox.

Purpose of the Study:

To resolve the debate on whether the human TEPR scales linearly or nonlinearly with baseline pupil size.
To determine the appropriate mathematical model for TEPR baseline correction.

Main Methods:

Manipulated baseline pupil size by altering room illuminance (dark, mid, bright).
Presented participants with auditory (pure-tone transitions) and visual (word lists) stimuli.
Measured phasic pupillary responses under controlled lighting and task conditions.

Main Results:

Phasic pupillary responses consistently scaled linearly across all tested lighting and task conditions.
The TEPR amplitude was demonstrated to be independent of baseline pupil size.
Evidence supports a linear scaling model for the human TEPR.

Conclusions:

The human TEPR exhibits linear scaling, independent of baseline pupil diameter.
This finding necessitates a reevaluation of established pupillometry methodologies and past study interpretations.
Standardizing baseline correction in cognitive pupillometry is crucial for reliable results.