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Hum Brain Mapp. 2015 Jul;36(7):2644-54. doi: 10.1002/hbm.22797. Epub 2015 Apr 2.

Oral contraceptive pill use is associated with localized decreases in cortical thickness.

Author information

1
Department of Psychiatry and Biobehavioral Sciences, Semel Institute, University of California, Los Angeles, California.
2
Department of Neurobiology and Behavior, Bonney Research Laboratory, University of California, Irvine, California.
3
Department of Neurology, Massachusetts General Hospital and Harvard Medical School, Massachusetts.
4
Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital and Harvard Medical School, Massachusetts.
5
Psychiatric Neuroimaging Division, Department of Psychiatry, Massachusetts General Hospital and Harvard Medical School, Massachusetts.

Abstract

Oral contraceptive pills (OCs), which are used to prevent pregnancy by the majority of women in the United States, contain steroid hormones that may affect the brain's structure and function. In this investigation, we tested the hypothesis that OC use is associated with differences in brain structure using a hypothesis-driven, surface-based approach. In 90 women, (44 OC users, 46 naturally-cycling women), we compared the cortical thickness of brain regions that participate in the salience network and the default mode network, as well as the volume of subcortical regions in these networks. We found that OC use was associated with significantly lower cortical thickness measurements in the lateral orbitofrontal cortex and the posterior cingulate cortex. These regions are believed to be important for responding to rewards and evaluating internal states/incoming stimuli, respectively. Further investigations are needed to determine if cortical thinning in these regions are associated with behavioral changes, and also to identify whether OC use is causally or only indirectly related to these changes in brain morphology.

KEYWORDS:

cortical thickness; hormonal contraception; morphometric analysis; neuroendocrinology

PMID:
25832993
PMCID:
PMC4478200
DOI:
10.1002/hbm.22797
[Indexed for MEDLINE]
Free PMC Article

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