Hi,
In general, you can look at memory/recall as something that would benefit from qigong practice, as part of overall health and longevity. Not necessarily singling it out as an area/aspect of self you have to direct qi to. As one gets older, I think the benefits of qigong would become more obvious, regarding a higher level of youthfulness, as compared to someone who doesn't practice qigong. Again this applies to all aspects of one's physical, mental, and spiritual self. Now, what I think is really wonderful about the positive side effects of qigong, as related to your question, and more specifically related to meditation, is the enhancement of intuition, the gaining of wisdom, a greater awareness of about the truth of things, an enhanced inner vision, and so on. These things don't necessarily happen in a slam bang way. It can be extremely subtle. You can make breakthoughs or continual progress in this way, the same way you move through physical healing. It is another aspect of personal transformation. I also see this aspect of transformation as eternal. It goes back before this lifetime, and continues past this lifetime. An experience of gained awareness you can take with you.