Dissociation between Selecting and Orienting Attentional Reading Deficits: A Study in Adults with Epilepsy

Area of Science:

• Neuroscience
• Cognitive Psychology
• Neurology

Background:

• Word reading relies on spatial attention for orienting and selection.
• Hemispheric lesions can disrupt these attention processes, potentially leading to reading deficits.

Purpose of the Study:

• To investigate dissociations in spatial attention deficits affecting word reading after hemispheric lesions.
• To differentiate between attention orienting and selection deficits in patients with epilepsy.

Main Methods:

• Thirty-nine epilepsy patients and 66 healthy controls performed a word-reading task with unilateral, bilateral, and cued word presentations.
• Words were presented in the left and right visual hemifields.
• Reading accuracy and response types were analyzed based on lesion laterality and presentation condition.

Main Results:

• Twenty-one patients (12 left, 9 right hemisphere lesions) exhibited word reading deficits.
• Four patients showed specific difficulties in the cued block, indicating attentional selection deficits.
• Twelve patients had asymmetric deficits, suggesting attention orienting or visual field impairments.

Conclusions:

• Spatial attention deficits following hemispheric lesions can manifest as distinct reading impairments.
• The visual field presentation method effectively distinguishes between different types of reading disorders, including orienting and selection deficits.
• Findings contribute to understanding the neural basis of reading and attention in neurological conditions.