We compared fMRI and cognitive data from nine hormone therapy (HT)-naive women with data from women exposed to either opposed conjugated equine estrogens (CEE) (n = 10) or opposed estradiol (n = 4). Exposure to either form of HT was associated with healthier fMRI response; however, CEE-exposed women exhibited poorer memory performance than either HT-naive or estradiol-exposed subjects. These preliminary findings emphasize the need to characterize differential neural effects of various HTs.
        
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Gleason CE, Schmitz TW, Hess T, Koscik RL, Trivedi MA, Ries ML, Carlsson CM, Sager MA, Asthana S, Johnson SC (2006) Hormone effects on fMRI and cognitive measures of encoding: importance of hormone preparation Neurology67: 2039-41