In order to find this out, the researchers selected a control group of 23 healthy sleep deprived adults for the study. The age range of the participants was between 18 to 31 years of age, there were 12 men and 11 women (the mean age was 23). There was originally 24 participants (12 men and 12 women), one of the women failed to participate on the conditions of the study. "We also excluded smokers and those who had consumed alcohol within two days of the protocol. One woman failed to participate in both conditions".(BMJ) In the study there were another group of 65 untrained observers whose main objective was to rate the faces of t...
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...ervers "(mainly students at the Karolinska Institute, mean age 30 (range 18-61) years, 40 women)"(BMJ) that were required to look at photographs of the 23 sleep study participants. The observers who were unaware of the study were required to rate the participants by attractiveness, health, and tiredness in 6 second intervals to prevent the memorization of the face. "Sixty five observers rated each of the 46 photographs for attractiveness, health, and tiredness: 138 ratings by each observer and 2990 ratings for each of the three factors rated. When sleep deprived, people were rated as less healthy (visual analogue scale scores, mean 63 (SE 2) v 68 (SE 2)), more tired (53 (SE 3) v 44 (SE 3)), and less attractive (38 (SE 2) v 40 (SE 2); P(BMJ) The perceived health and attractiveness of the participants sleep deprived photos decreased and the look of tiredness increased.
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