Europa writes:
For both thought and memory, sometimes there is a trigger. Sometimes there's none. And it is those times when there is no apparent trigger that puzzles me.
The key word is "apparent". Although there may not be an apparent reason or trigger for something you think or recall, that doesn't mean there isn't one. The brain and its processes are so complicated that you might liken it to such chaotic systems as the weather or the world economy. In those systems, a small unnoticed perturbation may trigger a chain reaction that ultimately results in far reaching consequences.
"Ignorance more frequently begets confidence than does knowledge: it is those who know little, not those who know much, who so positively assert that this or that problem will never be solved by science." - Charles Darwin.
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