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gwern comments on Open Thread: August 2009 - Less Wrong
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I define it practically: any mental state in which I'm able to score higher than usual playing Dual N-Back. Any more complex definition falling back on 'being able to suppress unwanted stimulus' or 'remembering in short-term or working memory that which is needed', seems too vague and begging the question for my taste.
That seems to me a definition of effectiveness, not focus.
Mayhap effectiveness is focus. Two words may denote the same concept, after all. As I said, any other definition seems to be essentially 'having in one's mind only that which is wanted', which is not a definition at all. My scores on DNB are positively correlated with my subjective impressions of focus; it's good enough for me.