Nonverbal Betrayal of Feelings Albert Mehrabain

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Nonverbal Betrayal of FeelingsAlbert Mehrabain

• Presented by Payton Ong
• April 25, 2005

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Hypothesis

• Some behaviors are unwittingly emitted when a
  person is deliberately deceptive
• Exhibits positive head nodding less frequently
• Smiles more
• Speaks at a slower rate and speaks fewer words
  with more frequent errors

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Experiment I

• Subjects communicate both truthfully and
  deceitfully
• Each subject gives a presentation on both
  advocating and condemning abortion.
• Additional money incentive for success and pain
  punishment for failure.

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Results of Experiment I

• Each dependent measure analyzed using 2X2X14X2
  factorial design.
• Males have more pleasant face while deceitful.
• Females have a higher sitting rocking movement
  race while given a reward for truth.
• Longer speech duration if given reward for truth.

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Table of Results I
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Experiment II

• Deceitful versus truthful quality of verbal
  communication
• Given specific and abstract issues, subjects try
  to
• Tell the truth so that the listener believes the
  subject is telling the truth
• Tell the truth such that the listener believes
  the subject is telling a lie
• Lie such that the listener believes the subject
  is telling the truth
• Lie such that the listener believes the subject
  is telling a lie.

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Results of Experiment II

• Analyzed using a 2X2X12X2X2 factorial design.
• Males less immediate if introverted.
• Face is more pleasant if acting to lie while
  actually lying
• Males gesture more if introverted while telling
  the truth. Females gesture more if extroverted
  and telling the truth.
• More head nodding if acting to lie while actually
  telling the truth.

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Table of Results II
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Experiment III

• Maximize a subjects desire to lie without being
  caught.
• Given an ESP test with an, unknown to the
  subject, experimenter
• Experimenter either tries or does not try to
  cheat. But test always ends with ESP true result.
• Subject is questioned about ESP result.

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Results of Experiment III

• Analyzed using a 2X2X8 factorial design.
• Subjects more relaxed if extroverted.
• Speech rate is quicker if deceitful.
• Speech volume is higher if subject has low
  anxiety (introverted).
• Higher percentage of talking during conversation
  if truthful.

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Table of Results III
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Conclusion

• Eye Contact
• Facial expressions
• Speech duration
• Body movements
• Head nodding