Left hemispatial neglect with a splenial lesion

Area of Science:

• Neuroscience
• Cognitive Psychology
• Neurology

Background:

• The corpus callosum facilitates interhemispheric communication, crucial for integrated visuospatial attention.
• Damage to specific regions, like the splenium, can disrupt these pathways, leading to attentional deficits.
• Spatial neglect, characterized by impaired attention to one side of space, is often associated with brain lesions.

Observation:

• A patient with Marchiafava-Bignami disease and isolated splenium damage was assessed for spatial neglect.
• The patient exhibited rightward deviations when bisecting lines in the left hemispace with her right hand.
• No significant deviations were observed when lines were in the midline, right hemispace, or when using the left hand.

Findings:

• This case demonstrates that splenium damage can induce a specific, asymmetrical form of spatial neglect.
• The observed asymmetry suggests a role for the splenium in mediating the allocation of visuospatial attention between hemispheres.
• The findings point to a potential disconnection between hemispheres impacting attentional processing.

Implications:

• Understanding the splenium's role refines models of visuospatial attention and interhemispheric interaction.
• This research could inform clinical assessments and rehabilitation strategies for patients with callosal or related brain injuries.
• Further investigation into the splenium's specific contribution to attention is warranted.