Matching to sample (spatial memory)—This is a 20-item test of spatial processing and
visuo-spatial working memory. The respondent examines a pattern produced by eight
shaded cells in a 4×4 sample grid. The sample is then removed and two comparison patterns
are displayed side by side. One grid is identical to the sample grid and the other grid differs
by one shaded cell. The user is instructed to identify the grid that matches the sample.