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I've found this too, but assumed it was placebo.

I lived at 6500' for a while - that was too high.

The sweet spot for me is a particular mountain I go to which starts at 1200m and goes to 2000 (although I don't spend time at the peak - it's a ski field).

Thanks for your anecdote, now I feel I can take my observations more seriously

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It could also be the sheer concentration of CO2. I work in a forest: 400ppm in the office every morning. Back at home, in the city, 5km away: 580ppm minimum all day long. Maybe cities make people stupid :D

Probably not in my case, haven't measured co2 but I am lucky to live in a small village.

It's incredible how quickly CO2 can build up inside a room. I'm also in a small village, and CO2 is 420ppm-ish outside. In my home office right now with the window open but no through flow, it's 1800ppm. If I close the window, it'll head off the scale of my CO2 monitor, above 5000ppm. Now that definitely is in the realm of cognitive impairment. I need some better ventilation.

Fair. My appropriate point of comparison (if I wasn't currently nitrogen drunk) should in fact have been mountains <1000m. Which I also love, but they don't have that clear headed altitude feeling.

Mount Washington?

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