The only thing I ever found to increase digit span in clinical trials is Xanomeline, I made a thread on that. I don't know how to get it though.
The supplementation of PM (Polygonum minus) showed significant intervention effect on Digit Span test (P<0.05) social functioning domain of 36-Item Short Form Health Survey (P<0.05) among subjects with mood disturbance. While, among subjects with good mood, PM supplementation improved Wechsler Abbreviated Scale of Intelligence (WASI) for IQ verbal (P=0.016) and Full Scale IQ of WASI (P=0.004). There were no adverse effects reported for the supplementation as indicated using biomarkers, including liver function and clinical symptoms.
One such cognitive domain that GBE has shown to improve across a number of studies is Working Memory (WM) [10, 15, 23, 24]. A previous study from our laboratory [15] revealed that 30-day administration of 120
mg/day GBE in young volunteers resulted in significant improvements in both digit span backwards and working memory speed. In a review of 29 randomized clinical trials examining the cognitive effects of GBE, Kaschel [22] concluded that as many as 20.7% of WM tests in chronic GBE trials had yielded significant results
for a similar study see Shader et al Ginkgo Wechsler digit symbol substitution
- similar results turn up en masse for bacopa and ginseng if you plug this into google: "digit span" ncbi saponin
- a general study on galantamine and cognitive function (which mentions digit span, at least in passing) reports a generally positive result [!]
- a study found a positive result for epa, dha, and vitamin d, suggesting a superiority of natural fish (sardines, salmon, tuna) which happen to also be rich sources of natural vitamin d. it is likely these benefits even outweigh the precautionary efforts taken to distill mercury out of refined fish oils. fish supplies iodine, selenium, as well as a unique balance of amino acids
i'm sure similar results could be obtained from more synthetic stuff, it's just we haven't done the experiments yet, e.g. amphetamine, armodafinil, methylene blue, desmopressin, C16, cerebrolysin, faso-, colu-, nefi-, or phenyl-piracetam, NA-Semax, tianeptine, and anything along those lines
in the end the test isn't a great predictor anyways. a 90 year old may have at best a 6 digit span compared someone younger with 9, however it also matters what you're thinking about.. what are your logical atoms, are you laying casing stones or mere bricks? for all we know the 90 year old could be some badass british philosopher who's owning your existence in every possible way
as for the marihuana, i don't know why but i have this image stuck in my mind of Mr. carl sagan breaking the corner off a brick of hashish before sitting down to put the finishing touches on his Cosmos finale
Edited by gamesguru, 28 September 2017 - 04:00 PM.
