Grey matter
[6] The grey matter includes regions of the brain involved in muscle control, and sensory perception such as seeing and hearing, memory, emotions, speech, decision-making, and self-control.[20][21][22] Women and men with equivalent IQ scores have differing proportions of grey to white matter in cortical brain regions associated with intelligence.[23] Pregnancy renders substantial changes in brain structure, primarily reductions in grey matter volume in regions subserving social cognition.[24] The profile of brain changes is comparable to that taking place during adolescence, a hormonally similar transitional period of life.[25] In the current edition[26] of the official Latin nomenclature, Terminologia Anatomica, substantia grisea is used for English grey matter.