Random Walker Test: A computerized alternative to the Road-Map Test

The Road-Map Test (RMT) is a popular neurological assessment of left-right orientation, using a simplified road map. Inspired by the RMT, we developed a new computerized navigation test, the Random Walker Test (RWT), for further quantitative assessment of left-right orientation ability. RWT provides verbal or nonverbal instructions for the direction (left, right, or front) in which to proceed, and participants must judge the spatially correct direction. Perspectives rotate by 90° during navigation. Verbal judgments demand verbal-to-spatial mapping of left/right/front and, if necessary, egocentric perspective rotation. Using the RWT, we evaluated the left-right orientation of normal male participants. The RWT reliably recorded the response times and error rates for participant performance and also revealed egocentric perspective rotation as an unreliable mental process with large intra- and interpersonal variability. These results indicate that the RWT may be useful in investigating left-right orientation and/or egocentric perspective rotation in both normal participants and neuropathological patients.