bal ▁memory , ▁ver bal ▁flu ency , ▁and ▁visual ▁memory ▁tasks ▁as ▁compared ▁to ▁those ▁who ▁did ▁not ▁under go ▁treatment . ▁It ▁is ▁widely ▁found ▁that ▁this ▁treatment ▁must ▁be ▁admin ister ed ▁near ▁to ▁the ▁on set ▁of ▁men op ause ▁as ▁opposed ▁to ▁several ▁years ▁post men op ause , ▁when ▁h orm one ▁ther apy ▁can ▁have ▁det r iment al ▁effects ▁on ▁cogn ition . ▁ ▁Research ▁is ▁incon clus ive ▁as ▁to ▁the ▁true ▁effects ▁of ▁est ro gen ▁on ▁hi pp oc amp al ▁volume ▁as ▁studies ▁show ▁results ▁differ ing ▁from ▁improved ▁cogn ition ▁and ▁maintained ▁hi pp oc amp al ▁volume ▁when ▁h orm one ▁ther apy ▁is ▁admin ister ed ▁during ▁men op ause ▁to ▁results ▁showing ▁no ▁obvious ▁benef icial ▁results . ▁ ▁History ▁Research ▁on ▁men op ause ▁as ▁a ▁whole ▁decl ined ▁with ▁the ▁end ▁of ▁the ▁Women ' s ▁Health ▁In iti ative ▁( W HI ) ▁studies , ▁but ▁research ▁on ▁the ▁treatment ▁of ▁sympt oms ▁associated ▁with ▁men op ause — es pecially ▁the ▁treatment ▁of ▁cogn itive ▁decl ine — cont in ues . ▁ ▁New ▁research ▁ref utes ▁the ▁WH I ▁find ings ▁that ▁est ro gen ▁ther apy ▁( ET ) ▁is ▁not ▁a ▁useful ▁treatment ▁for ▁men op aus al ▁sympt oms . ▁ ▁This ▁is ▁especially ▁shown ▁in ▁Al z heimer ' s ▁research ▁as ▁the ▁Women ' s ▁Health ▁In iti ative ▁Memory ▁Study ▁ref uted ▁the ▁argument ▁that ▁a