Trustworthiness of a smile as a function of changes in the eye expression

  1. Andrés Fernández-Martín 1
  2. Patricia Álvarez-Plaza 2
  3. Laura Carqué 2
  4. Manuel G. Calvo 2
  1. 1 Universidad Internacional de La Rioja
    info

    Universidad Internacional de La Rioja

    Logroño, España

    ROR https://ror.org/029gnnp81

  2. 2 Universidad de La Laguna
    info

    Universidad de La Laguna

    San Cristobal de La Laguna, España

    ROR https://ror.org/01r9z8p25

Journal:
Psicothema

ISSN: 0214-9915

Year of publication: 2017

Volume: 29

Issue: 4

Pages: 462-468

Type: Article

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Abstract

Background: Trusting other people is necessary for satisfactory and successful social interaction. A person’s perceived trustworthiness is related to perceived facial happiness. We investigated how trustworthy someone with a smiling face looks depending on changes in eye expression. Method: Video-clips of dynamic expressions were presented, with different combinations of the mouth (smiling vs. neutral) and the eyes (happy, neutral, surprised, sad, fearful, disgusted, or angry). Participants judged how happy (happiness task) or trustworthy (trustworthiness task) the expressers were. Results: Both happiness and trustworthiness judgments and reaction times varied as a function of small changes from happy to non-happy eyes in a smiling face, and depending on the specifi c nature of the eye expression, with angry eyes being particularly detrimental. Conclusions: Perception of facial happiness is more dependent on the smiling mouth, whereas trustworthiness relies more on eye expression. Judgments of untrustworthiness are especially sensitive to incongruence between the eyes and the mouth.

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Funding information

This research was supported by Grant PSI2014-54720-P from the Spanish Ministerio de Economía y Competitividad.

Funders

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