Our perceptual experiences are created by our brains and do not necessarily correspond to the physical properties of the world. To clarify the mechanisms by which the human brain generates perceptual experiences, I am studying human brains using psychophysics and functional brain imaging techniques. Furthermore, I am trying to clarify the causal relationship between the brain and perception by investigating how the perceptual experience changes when magnetic or electric current stimulation is applied to the brain. My goal is to apply the findings from these studies to develop technologies that allow us to control our subjective senses at will and to create new perceptual experiences that we have never experienced before.