Cancellation Test (Rudel et al., 1978) Cancellation Test is a two-part paper-and-pencil measure of visual scanning. Number Cancellation requires subject to strike out a three-digit target (257) intermittently placed in a large array of numbers; Shape Cancellation required subject to strike out a target shape (star) intermittently place in a filed of other shapes. The total number of commission error, correct hits, and completed time on the two separate tests will be recorded. Completion time divided by the number is calculated as one of the indices.