Clicks and concentration

Hi all. I’ve heard, on a couple of occasions, either David or Mike, state (and this is from memory) that every time a user has to click another button they lose 60% of their concentration. I’ve done a quick Google search, and of this forum, but can’t find the source of this. Does anyone know where this statistic comes from?

Doesn’t that depend on what type of button you need to click?

Eg, clicking a button that you know exactly where it is shouldn’t create any loss of concentration.
OTOH, when I look for a button or link that I can’t see immediately, I can easily loose 90% of my concentration, because the developer don’t have a clue where to put things in the correct place and order (yes, I’m looking at you Microsoft and you Adobe Illustrator)!

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