Anyone whom has taken a psilocybin containing mushroom will tell you that mushrooms have strange and magical powers ranging from deep insight to madness, so it doesn't seem so far fetched that a mushroom can improve cognition. I have found Lions mane, reishi and chaga mushroom supplements taken in combination over a few days have a noticeable effect increasing my calm and keeping me focused. Apparently microdosing with psilocybe mushroom has a similar effect according to my psychonaut friends.