** Shares of drug developer Alto Neuroscience ANRO.N rise 10% to $4.93 premarket
** Co says its experimental drug, ALTO-101, got the U.S. FDA's "fast track" designation, to help improve thinking and memory in people with schizophrenia
** FDA's "fast track" tag aims to speed development and review of drugs for serious conditions with unmet medical need
** Co is testing ALTO-101 in a mid-stage trial and said earlier studies showed it helped healthy volunteers think more clearly
** ALTO-101 works by boosting a brain chemical that helps with learning and memory and is delivered through the skin, co says
** As of last close, stock up 4% YTD
(Reporting by Kamal Choudhury in Bengaluru)
((Kamal.Choudhury@thomsonreuters.com;))