How the brain really works, butterflies

“The key insight: the brain is a multi-layer prediction machine. All neural processing consists of two streams: a bottom-up stream of sense data, and a top-down stream of predictions. These streams interface at each level of processing, comparing themselves to each other and adjusting themselves as necessary.”

This seems to be rocking my world. There’s an actual theory of how the brain works?

“So we are likely getting more lead, more omega-6 (and relatively less omega-3), and less lithium than people in 1850. If there has been an increase in crime and other undesirable/impulsive behaviors, I think these biological insults are at least as worthy of examination as political changes that have occurred during that time.”

…and my brain thought that this (aside from the actual data and science in the article) seems like a very compelling look at the big scale; tiny changes making subtle tidal shifts at the hundreds-of-millions-of-people scale.

Butterflies and radar

Popped up in an RSS feed today, right before I saw a Cosmopolitan (aka Painted Lady)

this afternoon. You do know I have an Instagram account, @cc1315?

Last weekend, at Art of Retreat, I delivered my presentation on the global state of Parkour organization.

The report is downloadable as a PDF from