In this study, it was found that a Buddhist meditation technique can improve visuospatial abilities for a period of time following the meditation session. This specifically refers to the ability to hold visuospatial images in mind for longer than the baseline period.
Although this doesn’t directly apply to any techniques used in the programs here, it does add to the body of evidence that meditation techniques have lasting, measurable, cognitive effects beyond the session itself.
Association for Psychological Science (2009, April 28). Buddhist Deity Meditation Temporarily Augments Visuospatial Abilities, Study Suggests. ScienceDaily.
http://www.sciencedaily.com/releases/2009/04/090427131315.htm