Diffuse Thinking
As opposed to focus thinking. When the mind is allowed to move away from focusing on a task or problem, and subconscious processing is still occurring.
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Perhaps the motor function of writing is part of this. I notice similar effects while walking and thinking too, though not always in the same way. It seems like the mind needs to be given a chance to meander, almost as if when the body is busy doing something else (writing, walking) it has a chance to actually not worry about what to do next and instead just relax on a thought and potentially discover something new about it. This feels in some way similar to diffuse thinking or benefits of walking
It is not clear to me that boredom is a state that reduces happiness. It does seem like some amount of boredom is valuable for diffuse thinking and creative insight.
Perhaps the motor function of writing is part of this. I notice similar effects while walking and thinking too, though not always in the same way. It seems like the mind needs to be given a chance to meander, almost as if when the body is busy doing something else (writing, walking) it has a chance to actually not worry about what to do next and instead just relax on a thought and potentially discover something new about it. This feels in some way similar to diffuse thinking or benefits of walking.