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> A careful study of different brain systems:
> 
> http://maxplanck.nautil.us/article/344/brain-on-autopilot?utm_source=Nautilus&utm_campaign=aeb099bd65-EMAIL_CAMPAIGN_2018_12_07_10_10&utm_medium=email&utm_term=0_dc96ec7a9d-aeb099bd65-60608337
> 
> "The structure of the human brain is complex, reminiscent of a circuit diagram with countless connections. But what role does this architecture play in the functioning of the brain? To answer this question, researchers at the Max Planck Institute for Human Development in Berlin, in cooperation with colleagues at the Free University of Berlin and University Hospital Freiburg, have for the first time analyzed 1.6 billion connections within the brain simultaneously. They found the highest agreement between structure and information flow in the “default mode network,” which is responsible for inward-focused thinking such as daydreaming.
> 
> "Using functional magnetic resonance imaging, they examined a total of 1.6 billion possible anatomical connections between these different regions in 19 participants aged between 21 and 31 years. The research team compared these connections with the brain signals actually generated by the nerve cells. 
> 
> "Their results showed the highest agreement between brain structure and brain function in areas forming part of the “default mode network,” which is associated with daydreaming, imagination, and self-referential thought. “In comparison to other networks, the default mode network uses the most direct anatomical connections. We think that neuronal activity is automatically directed to level off at this network whenever there are no external influences on the brain,”
> 
> ***
> 
> "... the default mode network seems to become active in the absence of external influences. In other words, the anatomical structure of the brain seems to have a built-in autopilot setting. It should not, however, be confused with an idle state. On the contrary, daydreaming, imagination, and self-referential thought are complex tasks for the brain.
> 
> “Our findings suggest that the structural architecture of the brain ensures that it automatically switches to something useful when it is not being used for other activities,” says Andreas Horn. “But the brain only stays on autopilot until an external stimulus causes activity in another network, putting an end to the daydreaming. A buzzing fly, a loud bang in the distance, or focused concentration on a text, for example.”
> 
> Comment: Our brain works at several levels in very complex ways. Much more than simple survival requires. As I see it here is little real evidence that survival plays any role in evolution, if humans are used as an example.