I'm not saying, in the least way, that Hum is illusory. I've been here too long, for that view :) Far from it- but these two artcles show ways the brain can construct between sound gaps with a memory mechanism built into inner ear structure hairs http://esciencenews.com/articles/2011/04/05/it.s.not.over.when.its.over.storing.sounds.inner.ear - and also how Theta brain waves are involved in our preception of sounds around us. http://esciencenews.com/articles/2009/11/25/auditory.illusion.how.our.brains.can.fill.gaps.create.continuous.sound This combination of persistence and spatial awareness figure strongly in hum, so by extrapolation- one has to ask 'What is the link, if any'? I hope these points are of interest and stimulate some debate- particularly on how vulnerable these tendencies leave us to noise & EM pollution. [Other interesting links on the site]
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