The self-ordered spatial search (SOSS) task is a touchscreen paradigm probing visuospatial working memory (SWM), that can be applied in non-human primate research in a preclinical translational setting. We examined the performance of the animals in the task on control baseline days and after a transient cognitive impairment induced by scopolamine, a muscarinic acetylcholine-receptor antagonist.Fourteen adult male rhesus monkeys performed the SOSS task daily, in 1-hour sessions with 300-500 trials each. In every trial the animals were shown a set of 4-8 identical cyan squares on a touchscreen, that they had to touch in an arbitrary order once, and only once. The set size level was determined based on individual performance. Each touch was followed by a 0.5-2s long delay period for which all stimuli disappeared from the screen then reappeared at the same location. We analyzed temporal patterns in memory errors to infer the animals’ task solving strategies and limitations of memory capacity. Continuous perseverative errors (CPE, touching a stimulus twice in a row – 1-back error) probably reflect inattention or motoric perseveration. Recurrent perseverative errors (RPE, non-CPE erroneous touches, (n>1)-back errors) are more likely to reflect failures of working memory.Increasing the set size resulted in selectively increased proportion of the RPEs that presumes higher levels of SWM involvement. Scopolamine increased the number of temporally more proximal errors, especially in animals on the lower set size level of 5. The analysis of error patterns in the easily learned SOSS task can facilitate its use in preclinical cognitive research.