Do supine position and deprivation of visual environment influence spatial neglect?

Area of Science:

• Neuroscience
• Cognitive Psychology
• Rehabilitation Science

Background:

• Spatial neglect is a common deficit after right-hemisphere stroke.
• Previous studies suggest darkness and supine positioning may help, but findings are debated and task-specific.

Purpose of the Study:

• To investigate the effects of body position (BP) and visual environment (VE) on spatial neglect in ecologically relevant tasks.
• To determine if reducing visual input or altering body position improves performance in patients with spatial neglect.

Main Methods:

• 17 right-hemisphere stroke patients (12 with neglect) and 12 healthy controls performed line bisection, text reading, number reading, and visual exploration tasks.
• Tasks were conducted on a computer screen under two body positions (sitting, supine) and two visual environments (light, dark).

Main Results:

• Darkness significantly reduced omissions in visual exploration and number reading tasks for neglect patients.
• Supine positioning did not improve performance and led to cognitive slowing, particularly in reading tasks.
• The positive effect of reduced visual information was limited but significant.

Conclusions:

• Reducing peripheral visual information, by performing tasks in darkness, can offer limited benefits for specific spatial neglect tasks.
• Supine positioning is not beneficial and may negatively impact cognitive function and task performance in neglect patients.
• Clinical assessments and therapies for spatial neglect should carefully control visual input and consider the potential negative effects of supine positioning.