^Yeah, I'm not sure, but I would be pretty surprised if memantine didn't do something to the effect. I haven't had a chance to take any "5HT2a" psychedelics with my memantine regimen (30-40mg daily) yet. The current regimen has invoked a rise from a pretty long, awful spell of depression for me, and I've been afraid of the deeper recesses of my mind for a while. Still, pretty soon I should be able to make a report.
Warning: high theory ahead (my preferred waters) -- The reason I'm interested in low-dose LSD, specifically the effects I mentioned if I can maintain them, is I want to retain my creative edge. It's very important to me, as I want to work in a creative field. I don't think d-amp has suppressed my creativity overall -- especially with, apparently, nucleus accumbens dopaminergic effects mostly preserved via memantine -- and I get more work done, but I do seem to spend less time "stopping to think" and more time zoned-in. From my past experiences, I know that when the mood/motivation effect disappeared, this functional loss of creativity seems to worsen, which is in line with the typical rapid desensitization of response to the psychostimulant in the limbic system in favor of prefrontal stimulation, which can work forever in some people and which probably can antagonize limbic systems to a degree. Hence the "focus but zombification" that some people report in their negative response to psychostimulant therapy for ADD/ADHD. Apollonian/Dionysian, eh? I do associate my current inhibition with amphetamine's adrenergic effect which (helpfully, though, for anyone with attention or executive function issues) preferentially stimulates prefrontal structures ...
http://www.sciencedirect.com/scienc...serid=10&md5=9a8e04b8ed067dc003062591aac06c36
Besides LSD, I wonder if adding a couple of small doses of guanfacine to my regimen (as has been done with some ADHD children to offset cardiovascular side effects) would improve cognitive flexibility, without sacrificing the positive effects like mood, motivation, confidence, focus.
Memantine's partial antagonism and "fast blocker/unblocker kinetics", which in theory at the right dose should help to suppress excess NMDA transmission without compromising normal levels of functioning involved in learning and cognition, supposedly make it a pretty unique thing among NMDA antagonists. I may make a thread about my experiences with the drug here, soon.