Bryan Johnson· Author
1000+ ppm cognitive function begins to drop.
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The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
1000+ ppm cognitive function begins to drop.
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>945 ppm: cognitive function declines ~15% on decision making and complex tasks
1400-2500 ppm: dramatic drop (up to 50%) on complex tasks. performance becomes "dysfunctional."
It became more crowded and the levels rose to 1312ppm. Now 1431 ppm My complex thinking ability is declining.