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Updated: Jun 8, 2026

Assessment of Cerebral Lateralization in Children using Functional Transcranial Doppler Ultrasound (fTCD)

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Cardiac phase modulates behavior and response related lateralization in visual spatial conflicts during change

Leon von Haugwitz¹, Edmund Wascher¹, Mauro F Larra¹

¹Department of Ergonomics, IfADo - Leibniz Research Centre for Working Environment and Human Factors, Dortmund, Germany.

Imaging Neuroscience (Cambridge, Mass.)

|March 4, 2026

Summary

Bodily signals from the heart influence attention. Cardiac cycle timing affects visual perception, impacting how we detect changes and resolve conflicts, especially under stress.

Keywords:

cardioafferent conflict task event related lateralization heart-brain stimulus-response-paradigm visual spatial attention

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Last Updated: Jun 8, 2026

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Area of Science:

Neuroscience
Psychology
Cardiology

Background:

The brain and heart communicate bidirectionally, influencing cognition.
How heart signals integrate with attentional selection is not fully understood.

Purpose of the Study:

To investigate the interaction between cardiac afferent signals and attentional selection.
To determine if cardiovascular responses modulate cardiac-phase effects on perception.

Main Methods:

A change detection task synchronized with the cardiac cycle.
Participants experienced perceptual conflicts and were exposed to cold pressor tests (CPT) or a warm water control.
Electroencephalography (EEG) was used to measure brain activity.

Main Results:

Cardiac phase modulated change detection, increasing errors during spatial conflicts and misses for isolated changes.
EEG data suggested altered premotor response encoding, not early sensory gating.
Individual differences in heart rate response to CPT and blood pressure interacted with cardiac-phase effects.

Conclusions:

Phasic bodily signals can bias visuomotor selection during perceptual tasks.
Cardiac signals influence attention and perceptual decision-making, particularly in conflict scenarios.
Cardiovascular state, especially individual responses to stress, modulates the impact of cardiac phase on cognition.