Sensory Substitution

David explains how the brain is fundamentally multisensory and how sensory substitution can feed information into the brain via an unusual channel and get the brain to perceive it. He talks about the brain port, which is a camera mounted on a mountaineer's tongue and an electro-tactile grid on his tongue that represents the visual image. He also talks about a vest covered in vibratory motors that can help deaf people understand the spoken world.