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  2. Positive (photography) - Wikipedia

    en.wikipedia.org/wiki/Positive_(photography)

    Positive film, which is used to develop photos (slides) that would go into a slide projector, is also known as “reversal,” “slide,” or “transparency” film. It is a film or paper record of a scene that represents the color and luminance of objects in that scene with the same colors and luminance (as near as the medium will allow).

  3. Facial feedback hypothesis - Wikipedia

    en.wikipedia.org/wiki/Facial_feedback_hypothesis

    The facial feedback hypothesis, rooted in the conjectures of Charles Darwin and William James, is that one's facial expression directly affects their emotional experience. . Specifically, physiological activation of the facial regions associated with certain emotions holds a direct effect on the elicitation of such emotional states, and the lack of or inhibition of facial activation will ...

  4. Smile - Wikipedia

    en.wikipedia.org/wiki/Smile

    A smile is a facial expression formed primarily by flexing the muscles at the sides of the mouth. Some smiles include a contraction of the muscles at the corner of the eyes, an action known as a Duchenne smile. Among humans, a smile expresses delight, sociability, happiness, joy, or amusement.

  5. Smiley - Wikipedia

    en.wikipedia.org/wiki/Smiley

    A smiley face balloon from a Gregory FUNNY-B'LOONS ad page 20 of The Billboard March 18, 1922 page 20 A promotional poster for the film Lili published in the New York Herald Tribune in 1953. In the latter half of the 20th century, the face now known as a smiley has evolved into a well-known symbol recognizable for its yellow and black features.

  6. Happiness - Wikipedia

    en.wikipedia.org/wiki/Happiness

    The Positive and Negative Affect Schedule (PANAS) from 1988 is a 20-item questionnaire, using a five-point Likert scale (1 = very slightly or not at all, 5 = extremely) to assess the relation between personality traits and positive or negative affects at "this moment, today, the past few days, the past week, the past few weeks, the past year ...

  7. Nasolabial fold - Wikipedia

    en.wikipedia.org/wiki/Nasolabial_fold

    The nasolabial folds, commonly known as "smile lines" [1] or "laugh lines", [2] [self-published source] are facial features. They are the two skin folds that run from each side of the nose to the corners of the mouth. They are defined by facial structures that support the buccal fat pad. [3] They separate the cheeks from the upper lip.

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  9. International Affective Picture System - Wikipedia

    en.wikipedia.org/wiki/International_Affective...

    The International Affective Picture System (IAPS) is a database of pictures designed to provide a standardized set of pictures for studying emotion and attention [1] that has been widely used in psychological research. [2] The IAPS was developed by the National Institute of Mental Health Center for Emotion and Attention at the University of ...