Raloxifene affects brain activation patterns in postmenopausal women during visual encoding.

Recent brain imaging studies have shown that estrogens alter brain activation patterns upon working memory tasks in postmenopausal women. Estrogens, however, have many systemic side effects. We investigated the effect of the Selective estrogen receptor modulator (SERM) raloxifene on brain activation patterns during a memory task in postmenopausal women with functional magnetic resonance imaging (fMRI). Twenty postmenopausal and right handed women (mean age 65.7 years; SD 3.0) were included in this double blind, placebo controlled and randomized study. Whole brain fMRI was performed before and after three months of daily treatment with raloxifene 60 mg or placebo. Each scanning session consisted of a visual encoding task, a recognition test and a simple photic simulation test. Data analyses was performed with SPM99b software. Specific regions of interest for the tasks were defined based in previous experiments. Visual encoding activated the ventral route, posterior medial temporal lobe and frontal cortex i...