This norm-referenced test quickly measures attentional processes commonly disrupted in acute and chronic brain damage or disease. The VSAT consists of four visual cancellation tasks that require the respondent to cross out letters and symbols that are identical to a target. A stopwatch is required for administration. It yields an overall attention score and provides separate scores for left- and right-side performance to assess visual field defects, unilateral spatial neglect, or syndromes that affect the perception of portions of the visual space. Test-retest reliability of the VSAT is .95 for an average retest interval of 2 months. It correctly differentiated 84 to 86% of normal and brain-damaged subjects in validation and cross-validation samples.