title: Diphenylhydantoin extension of short-term and intermediate stages of memory.
abstract: Diphenylhydantoin was shown to extend the duration of maximum availability of both short-term and intermediate memory in day-old chicks following a single trial passive avoidance learning task. Diphenylhydantoin also extended the time of susceptibility of long-term memory to inhibition by cyloheximide, suggesting that the extention of the life of intermediate memory was accompanied by a delay in long-term memory formation. Furthermore, while diphenylhydantoin counteracted amnesia induced by cycloheximide given 5 min before or immediately after learning, it had no effect on amnesia induced by cycloheximide administered 5 min or later after learning. For the latter, a second injection of diphenylhydantoin was necessary. This is consistent with the argument that the first injection of diphenylhydantoin extended the life of intermediate memory and delayed the formation of long-term memory.
mesh_terms: D000818:Animals; D001362:Avoidance Learning / Q000187:drug effects; D002645:Chickens; D003513:Cycloheximide / Q000633:toxicity; D008297:Male; D008568:Memory / Q000187:drug effects*; D008570:Memory, Short-Term / Q000187:drug effects*; D011939:Mental Recall / Q000187:drug effects*; D010672:Phenytoin / Q000494:pharmacology*; D011292:Premedication; D012153:Retention, Psychology / Q000187:drug effects
chemical_list: D010672:Phenytoin; D003513:Cycloheximide