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Covariation bias in the affect-modulated startle paradigm
Paul Pauli1, Oliver Diedrich, Anja Müller
1Department of Psychology, Biological and Clinical Psychology, University of Würzburg, Germany. pauli@psychologie.uni-wuerzburg.de
Journal of Behavior Therapy and Experimental Psychiatry
|March 12, 2003
Summary
A covariation bias, an overestimation of random associations, was found for unpleasant and pleasant images in the affect-modulated startle paradigm. This bias and startle response modulation appear to stem from different underlying mechanisms.
Area of Science:
- Cognitive psychology
- Neuroscience
- Psychophysiology
Background:
- A covariation bias (CB) involves overestimating random associations between stimuli and outcomes, particularly fear-relevant ones.
- The affect-modulated startle (AMS) paradigm measures physiological responses to stimuli of varying emotional valence.
Purpose of the Study:
- To investigate the presence of a covariation bias within the affect-modulated startle paradigm.
- To determine if covariation bias and affect-modulated startle responses share common underlying mechanisms.
Main Methods:
- Participants viewed unpleasant, neutral, and pleasant picture stimuli.
- Aversive reflex probes (startle responses) were delivered during picture presentation.
- A covariation bias index and startle response modulation were calculated.
Main Results:
- A significant covariation bias was observed for unpleasant and pleasant pictures compared to neutral pictures, likely due to arousal differences.
- Startle reflexes were modulated by the valence of the presented pictures.
- No correlation was found between the covariation bias index and the degree of startle response modulation.
Conclusions:
- The covariation bias is present in the affect-modulated startle paradigm.
- Covariation bias and affect-modulated startle responses are likely mediated by distinct underlying psychological and neural mechanisms.