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CONTEXT: Hormones regulate neuronal function in brain regions critical to cognition; however, the cognitive effects of postmenopausal hormone therapy are controversial. OBJECTIVE: The goal was to evaluate the effect of postmenopausal hormone therapy on neural circuitry involved in spatial working memory. DESIGN: A randomized, double-blind, placebo-controlled crossover study was performed. SETTING: The study was performed in a tertiary care university medical center. PARTICIPANTS: Ten healthy postmenopausal women of average age 56.9 yr were recruited. INTERVENTIONS: Volunteers were randomized to the order they received hormone therapy (5 microg ethinyl estradiol and 1 mg norethindrone acetate). Subjects received hormone therapy or placebo for 4 wk, followed by a 1-month washout period with no medications, and then received the other treatment for 4 wk. At the end of each 4-wk treatment period, a functional magnetic resonance imaging study was performed using a nonverbal (spatial) working memory task, the Visual Delayed Matching to Sample task. MAIN OUTCOME MEASURE: The effects of hormone therapy on brain activation patterns were compared with placebo. RESULTS: Compared with the placebo condition, hormone therapy was associated with a more pronounced activation in the prefrontal cortex (BA 44 and 45), bilaterally (P < 0.001). CONCLUSIONS: Hormone therapy was associated with more effective activation of a brain region critical in primary visual working memory tasks. The data suggest a functional plasticity of memory systems in older women that can be altered by hormones.

Original publication

DOI

10.1210/jc.2006-0907

Type

Journal article

Journal

J Clin Endocrinol Metab

Publication Date

11/2006

Volume

91

Pages

4476 - 4481

Keywords

Brain, Cross-Over Studies, Double-Blind Method, Drug Therapy, Combination, Estradiol, Estrogen Replacement Therapy, Female, Humans, Magnetic Resonance Imaging, Memory, Middle Aged, Models, Biological, Norethindrone, Placebos, Postmenopause, Radiography, Space Perception, Visual Perception