As far as I know, alternative sensation it's a sensation to distract people from the original stimuli, for example when you have to get an injection, the nurse will pinch you in the other arms so your brain is distracted and will not focus on the original pain in the arms that's got the injection.
But I also read here, alternative sensation refers to the brains that can process stimuli from multiple senses, for example when the eyesight is bad, the ears will take up and boost the visual system to help and stimulate the visual system (Visual + Auditory) .
Which one is exactly an 'alternative sensation'? Also, what is Time-Frequency in alternative sensation ? I would appreciate any references too.