Symmetry (physical attractiveness)

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In evolutionary psychology, symmetry especially facial symmetry is one of a number of traits, including averageness and youthfulness, associated with health, physical attractiveness and beauty of a person or animal.^[1] It is also hypothesized as a factor in both interpersonal attraction and interpersonal chemistry. Animal studies show that diseased mothers give birth to offspring that show greater asymmetries. From human studies, it is known that women with asymmetrical breasts are less fertile than those with greater symmetry.^[2]

Contents 1 Health and physical attractiveness 2 Interpersonal attraction 3 Historical perspective 4 References 5 Footnotes 6 External links

[edit] Health and physical attractiveness

Edler ^[3] cited research supporting the claim that bilateral symmetry is an important indicator of freedom from disease, and worthiness for mating. Facial asymmetries and minor physical anomalies begin to appear early in embryonic development, mainly the first trimester of pregnancy, and can be a sign of instability during this growth. Fluctuating asymmetry (random differences between two sides, as opposed to the deliberate natural asymmetry in some animals) develop throughout the lifespan of the individual and is a sign of the phenotype being subjected to some levels of stress.

The ability to cope with these pressures is partly reflected in the levels of symmetry. A higher degree of symmetry indicates a better coping system for environmental factors. While the visible signs of this may not be particularly apparent, it is thought that they have at least a subconscious effect on people's perception of their beauty. Zaidel et. al.^[4] in an empirical study upholds the claim that facial symmetry may be critical for the appearance of health. Their study disputes, however, the beauty or attractiveness claim.

Facial symmetry is neither the only trait nor is it necessarily the most important trait of what a culture considers attractive. The competing aesthetic theory of wabi sabi posits the existence of beauty through imperfection.

[edit] Interpersonal attraction

Suzi Malin, a British portrait painter, wrote Love at First Sight (ISBN 0-7566-0401-X) to examine the relationships of 50 celebrity couples. She speculates that there are three aspects of facial symmetry which attract one person to another: echoism, harmonism and prima copulism. Echoism is the similarity of one or more facial features, particularly the eyes, eyebrows, nose and mouth. Harmonism is a similarity in facial proportions, usually involving the features and the distance between them. Prima copulism is an attraction to another person based on them having similar features to someone with whom they formed a strong interpersonal bond with at an early age, usually a mother or father.

[edit] Historical perspective

This normative study of the bone structure of the face and skull places it in the intellectual traditions of Phrenology and Craniometry. These earlier traditions ambitiously sought to assess character, personality, or intelligence from a person's bone structure. By contrast, the current study primarily focuses on aesthetic concerns that, if misapplied, would not result in infringement of a person's legal or civil rights.

Since the 1990s, descriptive studies of human facial bone structure underlie the practice of face recognition systems using software for security applications. The reliability of these systems has been brought into question.

[edit] References

• Edler, RJ. June 2001. "Background Considerations to Facial Aesthetics". "Sexual reproduction and parasite resistance" section retrieved 31 May 2005.
• Fink, B; Manning, JT; Neave, N; Grammer, K. "Second to fourth digit ratio and facial asymmetry". "Introduction" section retrieved 31 May 2005.

[edit] Footnotes

1. ^ Rhodes, Gillian; Zebrowitz, Leslie, A. (2002). Facial Attractiveness - Evolutionary, Cognitive, and Social Perspectives. Ablex. ISBN 1567506364. 
2. ^ Morris, Desmond (1997). The Human Sexes – A Natural History of Man and Woman. St. Martin’s Press. ISBN 0312183119. 
3. ^ Edler R. J. "Background Considerations to Facial Aesthetics", (British) Journal of Orthodontics, Vol. 28, No. 2, June 2001, pp. 159-168.
4. ^ Zaidel D. W., Aarde S. M., and Baig, K. "Appearance of symmetry, beauty, and health in human faces", Brain and Cognition 57(3):(2005) pp. 261-263.

[edit] External links

• "Appearance of symmetry, beauty, and health in human faces" -- link to article by Zaidel et. al.
• "Teeth, Beauty, Biology, and Health" – a class handout on dentition and facial symmetry at the College of Dentistry – University of Illinois at Chicago.
• FaceResearch – Online studies on facial symmetry by researchers affiliated with University of Aberdeen (Scotland) School of Psychology, and University of St. Andrews (Scotland).
• Symmeter – a proprietary web-based application that measures symmetry