Audio-visual biofeedback system for postural control

This study presents an application of biofeedback in balance training, in particular an audiovisual balance rehabilitation system designed for training of the elderly. Motivated by the need to provide portable, cost-effective and accessible training devices, the system implements a MEMS accelerometer to quantify the balance board movements during a balancing task and use them to provide a real-time, synchronous audio-visual biofeedback. The visual feedback displays the offset and the overall performance of the balance board. The audio feedback is based on the sound localization cues that indicate the direction of the balance board movements using stereo sound. Initial results indicate a significant improvement in the postural stability when the audio-visual biofeedback is provided. The pilot study found significant improvements in maintenance and recovery of dynamic balance manifested through decreased variability of complex, lateral and front-to-back movements during a balancing task.