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Brain works parallel for all. If someone IQ is not that high, they still multi-task in many different way.

Brain will keep working if you notice your thoughts or not.

It will keep co-ordination of body,breathing,moving,thinking,blood circulation etc if you notive it or not.

Intelligence is not embarrassingly parallel problem -

its noticing your thoughts too much even in not-required situations that is embarrassing

His answer is fine.