Researchers are using ultrasound to trigger smell directly in the brain for VR

Researchers have developed a prototype device that uses focused ultrasound to directly stimulate the brain's olfactory bulb through the skull, creating smell sensations without any chemicals. The system positions an ultrasound transducer on the forehead, successfully generating various odor perceptions including fresh air, burning wood, and organic decay in test participants. This breakthrough could solve one of virtual reality's biggest limitations by enabling scent experiences without consumables or cartridges, potentially revolutionizing immersive media applications.