Studies show that becoming a father changes men’s brains in ways that help them tackle the complex tasks of being a parent, leading neuroscientists say.
By Shen Wu Tan – The Washington Times – Saturday, June 15, 2019
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Emotions such as heightened arousal can make pupils dilate. Belladonna (or deadly nightshade) was once used by women to dilate their pupils, thus making them seemingly more attractive.
Source: Wade, N. J. & Swanston, M. T. (2013), Visual Perception. An Introduction. 3rd edition, London, Taylor and Francis Group.