Nonlateralized attentional deficits: an important component behind persisting visuospatial neglect?

Area of Science:

• Neuroscience
• Neurology
• Cognitive Psychology

Background:

• Contralateral neglect is a common deficit following right hemisphere stroke.
• The relationship between neglect, attention, and reaction time requires further investigation.
• Understanding the neural correlates of persistent neglect is crucial for rehabilitation.

Purpose of the Study:

• To examine simple reaction time in right hemisphere stroke patients.
• To investigate the impact of contralateral neglect on reaction time.
• To identify anatomical correlates of persistent slow reactions in stroke patients.

Main Methods:

• Assessed simple reaction time to auditory stimuli in 60 right hemisphere stroke patients.
• Measured reaction times on the ipsilesional side of space at postacute and follow-up stages (6-7 months).
• Correlated reaction times with presence of contralateral neglect and CT scan findings.

Main Results:

• Patients with contralateral neglect showed significantly increased reaction times compared to those without neglect and normal controls.
• This difference in reaction time persisted from the postacute stage to the 6-7 month follow-up.
• Large lesions involving paraventricular white matter in the temporal lobe were associated with persistent slow reactions.

Conclusions:

• Lowered general attentional capacity may underlie persistent contralateral neglect after right hemisphere stroke.
• Simple reaction time deficits are a significant consequence of neglect.
• Temporal lobe white matter lesions are key anatomical correlates of persistent attentional impairments.