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Surface dependence: a balance control strategy in panic disorder with agoraphobia
R G Jacob1, J M Furman, J D Durrant
1Department of Psychiatry, University of Pittsburgh School of Medicine, Pennsylvania, USA.
Psychosomatic Medicine
|May 1, 1997
Summary
Individuals with agoraphobia exhibit impaired balance, particularly when proprioceptive cues are reduced. This reliance on non-proprioceptive sensory information may explain their discomfort in certain environments.
Area of Science:
- Neuroscience
- Psychology
- Human Physiology
Background:
- Vestibular dysfunction and balance issues are common in agoraphobia.
- This may lead to reliance on visual and proprioceptive sensory channels for balance.
- This strategy can cause discomfort in environments with limited sensory cues (space and motion discomfort).
Purpose of the Study:
- To investigate sensory integration of spatial information in individuals with agoraphobia.
- To test the hypothesis that agoraphobics utilize a non-vestibular balance control strategy.
Main Methods:
- Computerized dynamic posturography was used to assess balance.
- Participants included patients with panic disorder with agoraphobia, other anxiety disorders, depression, and healthy controls.
- Balance was tested under six sensory conditions manipulating visual and proprioceptive input.
Main Results:
- Agoraphobics demonstrated impaired balance when proprioceptive information was minimized (surface sway-referencing).
- This "surface dependence" was more pronounced in agoraphobics reporting space and motion discomfort.
- A significant difference was observed (p < 0.02).
Conclusions:
- Agoraphobics depend on proprioceptive cues for maintaining upright balance.
- This reliance may contribute to an intolerance of situations with unstable support.
- Findings support the link between sensory processing, balance, and agoraphobia symptoms.