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Related Experiment Video

Updated: Jun 7, 2026

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

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Published on: March 18, 2019

Unitary attention in callosal agenesis.

R Dell'acqua¹, P Jolicoeur, M Lassonde

¹University of Padova, Italy.

Cognitive Neuropsychology

|November 2, 2010

Summary

Individuals with agenesis of the corpus callosum show integrated visuospatial and central attention systems, despite slower task performance. Their attention components function similarly to those in individuals with a complete corpus callosum.

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Last Updated: Jun 7, 2026

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

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Published on: March 18, 2019

Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example

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Published on: October 24, 2012

Measurement of Neurophysiological Signals of Ignoring and Attending Processes in Attention Control

Measurement of Neurophysiological Signals of Ignoring and Attending Processes in Attention Control

Published on: July 5, 2015

Area of Science:

Neuroscience
Cognitive Psychology
Neuropsychology

Background:

The corpus callosum facilitates interhemispheric communication, crucial for integrated cognitive functions.
Agenesis of the corpus callosum (ACC) provides a unique model to study brain lateralization and interhemispheric integration of attention.

Purpose of the Study:

To investigate the interhemispheric organization of visuospatial and central attention components in individuals with ACC.
To compare the attentional performance of acallosal patients with matched normal controls.

Main Methods:

Utilized a visual search paradigm to assess the visuospatial component of attention with unilateral and bilateral displays.
Employed a psychological refractory period (PRP) paradigm to evaluate the central component of attention, manipulating stimulus onset asynchronies (SOAs) and response compatibility.
Compared performance of three acallosal patients with a matched control group.

Main Results:

Acallosal patients exhibited equivalent visual search rates for unilateral and bilateral displays compared to controls.
In the PRP task, acallosal patients showed greater mutual interference between lateralized tasks than controls.
Despite overall slower performance, the functional organization of attention components was comparable.

Conclusions:

The visuospatial and central components of attention in agenesis of the corpus callosum operate as interhemispherically integrated systems.
Findings suggest that the corpus callosum may not be essential for the basic interhemispheric integration of these specific attentional processes.
This study highlights the brain's remarkable plasticity and compensatory mechanisms in the absence of the corpus callosum.