I use it whenever I go outside to a) block out sounds and b) stimulate concentration by additional input.
May seem to be confusing, but music is special for my ears.
Unlike other sounds, music does not irritate, hurt me, distract me. I can't stand a quiet conversation without becoming irritated and unable to do a task while listening. But I can do everything just fine listening to music, no matter how high the volume is.
Music = special for me.
I don't own an IPod though, way too expensive. I just have a regular mp3 player.
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Autism + ADHD
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The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it. Terry Pratchett