Jigsaw Puzzles As Cognitive Enrichment (PACE) - the effect of solving jigsaw puzzles on global visuospatial cognition in adults 50 years of age and older: study protocol for a randomized controlled trial.
Patrick FisslerOlivia C KüsterLaura S LoyDaria LaptinskayaMartin J RosenfelderChristine A F von ArnimIris-Tatjana KolassaPublished in: Trials (2017)
ClinicalTrials.gov, NCT02667314 . Registered on 27 January 2016.