Yes, i also notice some effects, very quickly after having eaten them.
A bit of a dizzy kind of feeling. Very mild.
I think it could have something to do with serotonin receptors in our digestive system. The human digestive system, and especially the intestines, has a whole nervous system of its own down there, full of serotonin receptors. I believe i've read somewhere, that we have even more serotonin receptors in our belly, than in our brains.
It could be than these receptors are signalling to the brain "something is coming your way", well before it arrives.