Controlled audio-visual stimulation for anxiety reduction

Recent clinical data suggest that 75% of patients undergoing surgery are anxious, despite pharmacological measures to relieve anxiety. As an alternative to the administration of drugs, the scientific literature reports the relevant psychophysiological effects of auditory and visual stimulation in reducing preoperative anxiety. The main objective of this study is the development of a portable computer-controlled device for the simultaneous combined administration of audio-visual stimuli and the evaluation of this device through the collection and the statistical analysis of psychophysiological parameters strictly related to the state of anxiety.

A new algorithmic approach for the real-time association of sounds and colours is proposed and implemented in a low-cost architectural platform. The combined administration of auditory and visual stimuli is tested on 220 subjects undergoing dental surgery; in particular, psychophysiological parameters are collected and evaluated in four experimental conditions, in order to demonstrate the efficacy of cross-modal stimulation (auditory and visual) compared to non-pharmacological treatments based on monomodal stimuli (auditory or visual).

Non-parametric statistical techniques applied to the recorded experimental data show that the experimental conditions considered significantly differ. Pairwise comparisons between experimental groups show that the combined administration of sounds and colors significantly reduces the level of anxiety, systolic blood pressure and heart rate to a greater extent than monomodal stimulation.

The study demonstrates the potential benefits of a device for the combined administration of auditory and visual stimuli. The developed device has proven effective in reducing preoperative anxiety levels, becoming a serious candidate for non-pharmacological therapies. The study also encourages a deeper investigation of models capable of better capturing the potential of cross-modal stimulation, maximizing the desired effects (relaxation, arousal) on patients awaiting specific medical treatments.