A long while ago I remember being introduced to the idea that we do not sense the world directly because we actually experience the results of sensory data being turned into information.
The cells in the ear that turn mechanical vibration into electrical signals are just the beginning of a chain of circuits of neurological processing steps that turn those signals into what we perceive as stereophonic sounds. Sounds are what those neuro circuits create for us.
Similarly the signals from cells in your eyes’ retina that turn light and colour into electricity and chemistry aren’t vision – there is more processing going on before we get the ‘visuals’ that we think we see with our eyes.
And when something goes wrong with that processing we get strange effects. Dyslexics see some things, letter shapes, differently from the rest of us. Synesthesia causes people to taste colours and see sounds.
“researchers at the UNC School of Medicine showed they could target one brain region with a weak alternating current of electricity, enhance the naturally occurring brain rhythms of that region, and significantly decrease symptoms associated with chronic lower back pain”
Makes me wonder what other processing alterations could be done to repair or even enhance the basic human brain / mind system. That it can have an effect is pretty much recognized by now as this Reuters article “Do-it-yourself brain stimulation has hidden risks” shows.