The role of visuomotor abilities in different tests of sustained attention

Pen-and-paper tests of sustained attention, such as the d2 test, require participants to search several lines of stimuli for predefined target stimuli and to mark this stimulus with a pen. Notably, however, available tests of sustained attention differ in how targets should be marked. In particular, in the d2 test of sustained attention (and its successor, the d2-R), participants are supposed to ignore nontargets and to mark each target with a single stroke (dash). In contrast, in the FAIR-2 test of sustained attention, participants are supposed to draw a continuous line below the currently inspected stimulus line, and to mark each target with an upward spike. We presume that the FAIR-2 test imposes higher demands on visuomotor control, as compared to the d2 test, and therefore visuomotor abilities should have a higher impact on the results of the former, as compared to the latter, test.