Give this a shot...
Your brain can trick you into tasting the basic flavours i.e. sweet, savoury, salty and bitter; basically you can stimulate the nerves that run from those particular tastebuds psychosomatically, it works in the same way hypnosis does pretty much.
Like for instance if you close your eyes, tilt your head back and pretend to shake salt onto your tongue, you'll start to feel a mild saltiness and the back and sides of your tongue, it's really cool