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The Face of Early Cognitive Decline? Shape and Asymmetry Predict Choice Reaction Time Independent of Age, Diet or Exercise

School of Psychology, University of Bedfordshire, Park Square, Luton LU1 3JU, UK
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Symmetry 2019, 11(11), 1364; https://doi.org/10.3390/sym11111364
Received: 7 August 2019 / Revised: 26 October 2019 / Accepted: 29 October 2019 / Published: 3 November 2019
(This article belongs to the Special Issue Fluctuating asymmetry: A predictor of human life history outcomes)
Slower reaction time is a measure of cognitive decline and can occur as early as 24 years of age. We are interested if developmental stability predicts cognitive performance independent of age and lifestyle (e.g., diet and exercise). Developmental stability is the latent capacity to buffer ontogenetic stressors and is measured by low fluctuating asymmetry (FA). FA is random—with respect to the largest side—departures from perfect morphological symmetry. The degree of asymmetry has been associated with physical fitness, morbidity, and mortality in many species, including humans. We expected that low FA (independent of age, diet and exercise) will predict faster choice reaction time (i.e., correct keyboard responses to stimuli appearing in a random location on a computer monitor). Eighty-eight university students self-reported their fish product consumption, exercise, had their faces 3D scanned and cognitive performance measured. Unexpectedly, increased fish product consumption was associated with worsened choice reaction time. Facial asymmetry and multiple face shape variation parameters predicted slower choice reaction time independent of sex, age, diet or exercise. Future work should develop longitudinal interventions to minimize early cognitive decline among vulnerable people (e.g., those who have experienced ontogenetic stressors affecting optimal neurocognitive development). View Full-Text
Keywords: developmental stability; fluctuating asymmetry; face shape variation; geometric morphometrics; choice reaction time; diet; polyunsaturated fatty acids omega-3; physical activity early cognitive decline developmental stability; fluctuating asymmetry; face shape variation; geometric morphometrics; choice reaction time; diet; polyunsaturated fatty acids omega-3; physical activity early cognitive decline
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Brown, W.M.; Usacka, A. The Face of Early Cognitive Decline? Shape and Asymmetry Predict Choice Reaction Time Independent of Age, Diet or Exercise. Symmetry 2019, 11, 1364.

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