Thanks Mark: if I understand you correctly, I should attempt to be conscious of where things are around me. That is actually what I'm currently doing. Have you made any attempts to retrain this? It's certainly possible to continue to be attentive but it would be nice to retrain this skill (even if over 20 years). If you have made attempts to retrain, is that what you mean by "hear someone behind me, take a look and notice how 20 feet away sounds vs 2 feet away"?