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Updated: Aug 11, 2026
10:05
A Large Lateral Craniotomy Procedure for Mesoscale Wide-field Optical Imaging of Brain Activity
Published on: May 7, 2017
Divided visuo-spatial attention systems with total and anterior callosotomy
M Arguin1, M Lassonde, A Quattrini
1Département de Psychologie, Université de Montréal, Centre-ville, Canada. arguinm@psy.umontreal.ca
Neuropsychologia
|March 11, 2000
Summary
Patients with corpus callosum damage can attend to both visual fields simultaneously. This suggests each brain hemisphere manages its own visuo-spatial attention independently.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Neuropsychology
Background:
- The corpus callosum facilitates inter-hemispheric communication.
- Its role in visuo-spatial attention is not fully understood.
- Previous research suggests hemispheric specialization in attention.
Purpose of the Study:
- To investigate the corpus callosum's role in integrating visuo-spatial attention.
- To examine attention capabilities in patients with callosotomies.
Main Methods:
- Assessed reaction times (RTs) to visual targets in patients with total or anterior callosotomies and healthy controls.
- Utilized arrow cues to direct or divide attention before target presentation.
Main Results:
- Callosotomy patients showed similar RTs for valid and divided-attention cues, both faster than neutral cues.
- Neurologically intact subjects had faster RTs with valid cues only, not divided-attention cues.
- Split-brain patients could attend to both visual fields concurrently.
Conclusions:
- The corpus callosum is crucial for integrating visuo-spatial attention between hemispheres.
- Most split-brain patients exhibit independent hemispheric control over visuo-spatial attention.
- Each cerebral hemisphere possesses its own visuo-spatial attention mechanism.
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01:24Vision
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01:14Motor and Sensory Areas of the Cortex
The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
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The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.
01:21Association Areas of the Cortex
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01:28Lateralization
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