Arousal, valence and their relative effects on postural control

Area of Science:

• Psychology
• Neuroscience
• Biomechanics

Background:

• Emotional state influences postural control, with valence and arousal being key dimensions.
• Previous research focused on valence, neglecting the independent role of arousal.
• Arousal affects sensory and neuromuscular systems critical for maintaining balance.

Purpose of the Study:

• To investigate the independent effects of emotional valence and arousal on postural control.
• To examine how independently manipulated arousal and valence influence balance.
• To determine if arousal or valence is a primary driver of postural changes.

Main Methods:

• Participants stood quietly while viewing affective pictures categorized by arousal (high/low) and valence (pleasant/unpleasant).
• Collected data included center of pressure (COP) for postural sway and electrodermal activity (EDA) for physiological arousal.
• Experimental design allowed for independent manipulation and assessment of arousal and valence effects.

Main Results:

• Increased arousal significantly elevated both electrodermal activity (EDA) and anterior-posterior COP frequency (body sway).
• Emotional valence (pleasantness/unpleasantness) did not produce significant changes in postural control.
• Postural changes observed under high arousal mirrored those in other stressful or high-stakes situations.

Conclusions:

• Emotional arousal, rather than valence, is a significant mediator of postural control.
• Arousal influences balance through physiological and sensory-motor pathways.
• Arousal should be considered a potential confound in experimental and clinical assessments of postural control.