I put my Body where my mouth is and tried some stuff with mushrooms. With this equipped the whole time:
Hat: twisted glasses
Weapon: toxic spear
Offhand: crystalline mushroom
Shirt: stained bandages
Pants: infested containment pants
Gadget: black rose
I took one Eclipse and gained 9 duration of Ocean Sight
Then I took one red toadstool and gained 10 duration of Altered State
Then I took one warty toadstool and gained 10 duration of Focused Perception
With all of those effects active, I used a shaman staff, and got the consumption message on the wiki and expected stat gains:
You've earned 2 XP in Perception
You've earned 1 XP in Reflexes
You've earned 1 XP in Strength
You've earned 2 XP in Will
Then I used a shaman's brew, and again got the standard message and effects:
You've earned 2 XP in Perception
You've earned 2 XP in Reflexes
You've earned 5 XP in Strength
You've earned 1 XP in Will
To see if maybe the memory would change if I used another one right after, I used another shaman's brew, but got the same results except for a different stat distribution:
You've earned 6 XP in Perception
You've earned 1 XP in Reflexes
You've earned 2 XP in Strength
You've earned 1 XP in Will
Then I had only 1 Body left, so I took one more shaman staff and got nothing special
You've earned 2 XP in Reflexes
You've gained Reflexes!You've earned 4 XP in Strength
Using black spores with all the above active just got me the technique.
Nothing special from using the Spore Cloud technique with all of those effects active. The Mushroom Man just led me to a crate of Eclipse when I followed him, like normal.
Now I am out of E/H/B and going to reset. Negative results ftw!