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Human freezing in response to affective films
Muriel A Hagenaars1, Karin Roelofs, John F Stins
1a Behavioral Science Institute, Radboud University Nijmegen , Nijmegen , The Netherlands.
Anxiety, Stress, and Coping
|June 29, 2013
Summary
This study found that unpleasant films, unlike neutral or pleasant ones, trigger human freezing responses, characterized by reduced body sway and heart rate deceleration. This suggests films can effectively elicit defense reactions.
Area of Science:
- Psychology
- Neuroscience
- Human Defense Mechanisms
Background:
- Human freezing is an objective defense response, previously studied using passive picture viewing.
- Affective films are known to elicit emotional responses, but their capacity to induce freezing-like defense behaviors is not well understood.
Purpose of the Study:
- To investigate whether affective film fragments can elicit freezing-like defense responses in humans.
- To determine the stability and generalizability of freezing responses to ecologically valid stimuli.
Main Methods:
- Fifty participants stood on a stabilometric platform and wore a polar band to measure heart rate.
- Participants watched neutral, pleasant, and unpleasant film fragments.
- Body sway and heart rate were continuously monitored to identify freezing-like responses.
Main Results:
- Unpleasant film fragments, but not neutral or pleasant ones, elicited freezing-like responses, indicated by reduced body sway and heart rate deceleration.
- An early reduction in body sway (1-2 seconds post-stimulus onset) was observed specifically for the unpleasant film.
- A correlation between heart rate and body sway was present only during exposure to the unpleasant film.
Conclusions:
- Ecologically valid stimuli, such as affective films, are capable of eliciting human defense responses.
- The findings highlight the importance of analyzing the temporal dynamics of defense reactions to differentiate response stages.
- Future research should explore the generalizability of these findings across various stimuli and contexts.
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