Height discrimination (also known as heightism) is prejudice or discrimination against individuals based on height. In principle, it refers to the discriminatory treatment against individuals whose height is not within the normal acceptable range of height in a population. Various studies have shown it to be a cause of bullying, commonly manifested as unconscious microaggressions.
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Research indicates that the human brain uses height as one factor in a heuristic measure of social status and fitness. Studies have observed that infants as young as 10 months old unconsciously associate height with leadership potential, power, strength and intelligence. Both the cognitive and the unconscious heuristic association between height and the mentioned traits has also been found to be stronger when assessing men than women.