Abstract: Hemispatial neglect(HSN) is an important predictor of poor outcome after stroke. It is hypothesized to result from the damage to a network for directed attention which involves the frontal, parietal and cingulate cortices, basal ganglia, thalamus and superior colliculus. Neglect is most commonly associated with lesions in the right inferior parietal lobe. The damage of temporal-parietal-occipital junction causes HSN easily in human. The measurement of rCBF of lesions, and further to be oriented and quantified, can make a new view for HSN by use of the sensitive SPECT technique.