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Related Experiment Video

Updated: Jun 15, 2026

Association Between Sleep Quality and Cognitive Symptoms in Patients with Major Depressive Disorder

Association Between Sleep Quality and Cognitive Symptoms in Patients with Major Depressive Disorder

Published on: April 26, 2024

Poor performance on cognitive tasks in depression: Doing too much or not enough?

Neil P Jones¹, Greg J Siegle, Emilie R Muelly

¹Western Psychiatric Institute and Clinic, Pittsburgh, Pennsylvania, USA. jonesnp@upmc.edu

Cognitive, Affective & Behavioral Neuroscience

|March 18, 2010

Summary

Cognitive deficits in depression may stem from increased attention to internal thoughts rather than tasks. Pupillary motility analysis revealed depressed individuals allocate more resources to intrinsic processing, impairing cognitive performance.

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Area of Science:

Cognitive Neuroscience
Clinical Psychology
Psychophysiology

Background:

Depression is associated with impaired cognitive function.
The underlying mechanisms of cognitive deficits in depression remain unclear, with debate on resource allocation versus attentional biases.

Purpose of the Study:

To investigate whether cognitive deficits in depression are linked to task-related processing or intrinsic processing.
To examine pupillary motility as an indicator of cognitive resource allocation in depressed and healthy adults.

Main Methods:

Assessed pupillary motility during a cognitive task in depressed and healthy adults.
Interpreted pupillary motility at stimulus frequency as task-related processing and at other frequencies as intrinsic processing.
Correlated pupillary motility patterns with cognitive performance and error rates.

Main Results:

Depressed participants exhibited more consecutive errors compared to controls.
Increased pupillary motility at non-stimulus frequencies correlated with poorer performance.
Elevated pupillary motility at non-stimulus frequencies in depressed individuals partially explained their cognitive deficits.

Conclusions:

Findings suggest that cognitive deficits in depression are partly due to the allocation of cognitive resources to intrinsic, non-task-related processing.
This research provides psychophysiological evidence supporting the role of internal distractibility in depressive cognitive impairment.