Having established that women with MRMD show a differential behavioral response to estrogen and progesterone, we now hope to identify the underlying mechanisms and physiologic concomitants of the differential behavioral sensitivity by performing studies (described in companion protocols) under the three hormonal conditions created by this protocol, and comparing results obtained with those seen in normal controls (Protocol #92-M-0174). Planned studies include the following: cognitive testing, brain imaging (3D PET, FMRI, MRS) and genetic studies including induced pluripotent cells.