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Human variability, or human variation, is the range of possible values for any characteristic, physical or mental, of human beings. Frequently debated areas of variability include cognitive ability , personality , physical appearance ( body shape , skin color , etc.) and immunology .
In rare cases, congenital defect results in a short tail-like structure being present at birth. Twenty-three cases of human babies born with such a structure have been reported in the medical literature since 1884. [22] [23] In these cases, the spine and skull were determined to be entirely normal. The only abnormality was that of a tail ...
Fear of perceived body image flaws, misconceptions about one’s own physical appearance, body-checking behavior Body dysmorphic disorder ( BDD ), also known in some contexts as dysmorphophobia , is a mental disorder defined by an overwhelming preoccupation with a perceived flaw in one's physical appearance. [ 1 ]
There are many instances of mythological characters showing signs of a deformity.. Descriptions of mermaids may be related to the symptoms of sirenomelia.; The Irish mythology includes the Fomorians, who are almost without exception described as being deformed, possessing only one of what most have two (eyes, arms, legs, etc.) or having larger than normal limbs.
According to the Centers for Disease Control and Prevention (CDC), most birth defects are believed to be caused by a complex mix of factors including genetics, environment, and behaviors, [13] though many birth defects have no known cause. An example of a birth defect is cleft palate, which occurs during the fourth through seventh weeks of ...
Human physical appearance is the outward phenotype or look of human beings. Image of a European female (left) and an East Asian male (right) human body seen from front (upper) and back (lower). Adult human bodies photographed whose naturally-occurring pubic, body, facial, but not head hair have been deliberately removed to show anatomy.
The distribution of many physical traits resembles the distribution of genetic variation within and between human populations (American Association of Physical Anthropologists 1996; Keita and Kittles 1997). For example, ~90% of the variation in human head shapes occurs within continental groups, and ~10% separates groups, with a greater ...
Abnormal psychology is the branch of psychology that studies unusual patterns of behavior, emotion, and thought, which could possibly be understood as a mental disorder. Although many behaviors could be considered as abnormal , this branch of psychology typically deals with behavior in a clinical context.