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Title: The effects of stress-induced cortisol responses on approach-avoidance behavior
Author(s): K. Roelofs, B.M. Elzinga and M. Rotteveel
Journal: Psychoneuroendocrinology
Year: 2005
Volume: 30
Issue: 7
Pages: 665--677
Publisher address: Section of Clinical and Health Psychology, University of Leiden, P.O. Box 9555, 2300 RB Leiden, The Netherlands. roelofs@fsw.leidenuniv.nl
File URL: vuams-pubs/Roelofs_2005.pdf
Keywords: Adult, Affect, Anger, Animals, Anxiety, Anxiety Disorders, Blood Pressure, Facial Expression, Female, Heart Rate, Humans, Hydrocortisone, Male, metabolism, Motor Activity, Movement, Netherlands, Norepinephrine, physiology, psychology, Reaction Time, Saliva, Social Environment, Stress,Psychological
Abstract: High glucocorticoid stress-responses are associated with prolonged freezing reactions and decreased active approach and avoidance behavior in animals. The present study was designed to investigate the effects of cortisol responses and trait avoidance on approach-avoidance behavior in humans. Twenty individuals were administered a computerized approach-avoidance (AA)-task before and after stress-induction (Trier Social Stress Test). The AA-task involved a reaction time (RT) task, in which participants made affect congruent and affect incongruent arm movements towards positive and threatening social stimuli. Affect congruent responses involved arm extension (avoidance) in response to angry faces and arm flexion (approach) in response to happy faces. Reversed responses were made in affect incongruent instruction conditions. As expected, participants with high cortisol responses showed significantly decreased RT congruency-effects in a context of social stress. Low trait avoidance was also associated with diminished congruency-effects during stress. However, the latter effect disappeared after controlling for the effects of cortisol. In sum, in agreement with animal research, these data suggest that high cortisol responses are associated with a decrease in active approach-avoidance behavior during stress. These findings may have important implications for the study of freezing and avoidance reactions in patients with anxiety disorders, such as social phobia and post-traumatic stress disorder

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