Monocular patching may worsen sensory-attentional neglect: A case report

To determine whether monocular patching influences the performance of a pat ient with primarily sensory-attentional bias on the line bisection task, we present a case study of a 49-year-old woman who had right cortical infarct ion affecting temporal, parietal, and occipital regions. She had primarily sensory-attentional bias when performing the line bisection task on a video apparatus. In hospital, she was tested with monocular eye patching of the left or the right eye or unpatched. Paradoxically, the right-eye patching s ignificantly worsened and the left patch significantly improved performance . The eye may have some input to the ipsilateral as well as the contralater al superior colliculus. Alternatively, the patch-a novel tactile stimulus-m ay induce orienting to its side via noncollicular mechanisms, When using a monocular patch for any reason, clinicians should be aware that increased s patial bias may occur.