It is already possible to restore sensory input when it has been damaged by trauma or is congenitally missing: cochlear implants, retinal implants, and gene therapy have all been used to restore the full input portfolio of conscious experience. We can use the same principles to add extra senses to the human sensory portfolio, possibly from animals. We have already given some animals extra senses — bestowing a snake’s ability to see in the infrared on a rat using optogenetics, for example.17 Some researchers have used wearables or implants to give themselves magnetic senses18 or the ability to feel sound.19
However, expansion of consciousness doesn’t have to stop at senses. It is possible to deliver artificial sensory input with psychotropic drugs like psilocybin, virtual reality, and robotic embodiment. VR could make it possible to expand our definition of consciousness by changing our environment or body. Full immersion may even change our linear experience of time by allowing us to pre-live possible future experiences, or re-live past memories.