The 3s Spreadsheet Test version 2 for assessing egocentric viewer-centered and allocentric stimulus-centered spatial neglect

The present study established the norms of the 3 s Spreadsheet Test version 2 (3S-v2 Test) with 186 healthy adults, compared performance of 23 individuals with spatial neglect after right brain stroke to the norms, and examined the extent that allocentric neglect is independent from egocentric neglect. The task required in the 3S-v2 Test is to cross out the target digit "3" in a spreadsheet that contained 10 columns and 14 rows of digit strings, including 120 target digits and 720 non-target digits. Each target is categorized with respect to its location on the page (egocentric viewer-centered) and its position within the digit string (allocentric stimulus-centered). Patients completed the 3S-v2 Test, the Apples Test, and Scene Copying Test (a five-object figure copying test). Based on the neglect classification criteria of these three tests, 18 patients (78.3%) were identified with both forms of neglect, three patients (13.0%) had isolated egocentric neglect, and two (8.7%) had isolated allocentric neglect. Among patients who were determined as having allocentric neglect by a given test, we found no significant correlation between severity of allocentric neglect and stimulus location in the egocentric reference frame. Based on the present findings, we suggest that including the 3S-v2 Test, a functionally relevant task and different from the currently available tests, may increase the comprehensiveness of neglect assessment. In addition, allocentric neglect symptoms are independent of egocentric locations.