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Last Updated: Oct 11, 2012 - 10:22:56 PM
Research Article
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Beauty is Indeed Skin Deep - Research

Jun 13, 2006 - 2:34:00 AM , Reviewed by: Venkat Yelamanchili
"Because skin has optical depth, our eyes perceive discolorations on the surface and in underlying layers. We believe the judgment of facial skin age is influenced by the frequency of lines and wrinkles, but also by uneven chromophore distribution and a decrease in light reflection,"

 
[RxPG] Using a revolutionary imaging process, a new study is revealing that wrinkles aren't the only cue the human eye looks for to evaluate age. Scientists at the Ludwig-Boltzmann-Institute for Urban Ethology, Austria and the Department for Sociobiology/Anthropology at the University of Goettingen, Germany have shown that facial skin color distribution, or tone, can add, or subtract, as much as 20 years to a woman's age.

The study used 3-D imaging and morphing software technologies to remove wrinkles and bone structure from the equation to determine the true impact of facial skin color distribution on the perception of a woman's age, health and attractiveness and is currently in the edit acceptance process with the journal Evolution and Human Behavior.
Beauty is Indeed Skin Deep - Research

"Until now, skin's overall homogeneity and color saturation received little attention among behavioral scientists. This study helps us better understand that wrinkles are not the only age cue. Skin tone and luminosity may be a major signal for mate selection and attractiveness, as well as perceived age," says lead researcher Dr. Karl Grammer, Founder and Scientific Director of the Ludwig-Boltzmann-Institute for Urban Ethology, University of Vienna, Austria.

Taking digital photos of 169 Caucasian women aged 10-70, the researchers used specialized morphing software to "drape" each subject's facial skin over a standardized bone structure. Other potential age-defining features such as facial furrows, lines and wrinkles were removed. Tone variances can be caused by several factors including cumulative UV damage (freckles, moles, age spots) natural aging (yellowing, dullness) and skin vascularization (redness). "Whether a woman is 17 or 70, the contrast of skin tone plays a significant role in the way her age, beauty and health is perceived," says study co-author Dr. Bernhard Fink, Senior Scientist in the Department for Sociobiology/Anthropology at the University of Goettingen, Germany.

"Skin tone homogeneity can give visual clues about a person's health and reproductive capability, so an even skin tone is considered most desirable. In this study, we found cumulative UV damage influences skin tone dramatically, giving women yet another reason to prevent UV-related skin damage or try to correct past damage that is causing uneven skin tone."

The study design employed high-resolution digital images, taken under cross-polarized lighting conditions, obtained from 169 female subjects aged 10-70 years. The resulting images were then transposed to a standard 2-D template that was then fitted to a standardized virtual 3-D skull where confounding variables such as overall face shape, lighting, camera angle, eye color/form and hairstyle were eliminated, leaving composite skin pigmentation (tone) as the only variable.

These 169 standardized "stimuli" faces with skin color distribution as the only variable were then blind-rated by 430 participants (incomplete design such that each rater judged 10 randomized stimuli). Raters were asked to estimate the age of stimuli faces as well as answer questions relating to general attractiveness, health and skin attributes.

As a next step, Drs. Grammer and Fink will partner with P&G Beauty scientist and skin imaging expert, Dr. Paul Matts to look at the distribution of light reflecting molecules – called chromophores - in study subject's skin and correlate them with perceived attractiveness. A non-invasive imaging technology called the SIAscope – originally developed for early skin cancer detection – will help the scientists get under the skin's surface to study the chromophores. Chromophores directly affect how the human eye perceives qualities such as luminosity in young skin or dullness in aging skin.

The researchers already know from the previous tone study that the uneven distribution of one chromophore – melanin – is related to cumulative UV damage, and seems to increase perceived age.

"Because skin has optical depth, our eyes perceive discolorations on the surface and in underlying layers. We believe the judgment of facial skin age is influenced by the frequency of lines and wrinkles, but also by uneven chromophore distribution and a decrease in light reflection," says Grammer.



Publication: Ludwig-Boltzmann-Institute for Urban Ethology (Austria) and the Department for Sociobiology/Anthropology at the University of Goettingen (Germany). Human Behavior and Evolution Society (HBES) annual meeting, June 7-11, 2006, in Philadelphia, PA.
On the web: evolution.anthro.univie.ac.at/institutes/urbanethology/ 

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 Additional information about the news article
The Ludwig-Boltzmann-Institute for Urban Ethology was founded in 1972. It is a division of the Ludwig Boltzmann Society for the promotion of the sciences, a semi-public non-profit institution for the promotion of the sciences in Austria. The institute works on a multidisciplinary basis. The scientific staff consists of medical doctors, psychologists and sociologists. It is financed by a subsidy from the Ludwig-Boltzmann-Society, the Austrian Federal Ministry of Work, Health and Social Affairs and through contracts for research projects. The Ludwig-Boltzmann-Institute is one of 129 research institutes belonging to the Ludwig-Boltzmann Society.

The Department of Sociobiology/Anthropology at the University of Goettingen devotes its research to the scientific study of behavior in humans and primates. The scientific staff consists of anthropologists, ethologists, behavioral ecologists, and geneticists, and research involving humans focuses on the study of physical attraction and the hormonal basis of behavior. The department's activities are mainly funded by the University of Goettingen and the German Volkswagen Foundation.

P&G Beauty science has more than 1,800 scientists and technical employees working at nine global technical centers with an unparalleled commitment to technology development. Company scientific efforts have resulted in over 3,500 active beauty care patents. This allows P&G to develop products uniquely suited for different types of hair and skin, and tailored to different cultures and climates. P&G scientists are constantly seeking new ways of turning inspiration into innovation.

P&G Beauty sells more than 130 different brands in over 180 countries worldwide that touch and improve lives daily. P&G Beauty had more than $19 billion in global sales in fiscal year 2004-05, making it one of the world's largest beauty companies. The global leading beauty company at mass, P&G Beauty brands include: Pantene®, Head and Shoulders®, Olay®, Max Factor®, Cover Girl®, Gillette® Complete Skin Care for Men, Always®, Joy®, Hugo Boss®, Wella®, Herbal Essences®, Clairol Nice 'n Easy® and SK-II®. Please visit www.pg.com for the latest news and in-depth information about P&G Beauty and its brands.
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