Question: What do you call it when your mind starts examining things automatically because of being exposed to these things in the past. This is not intentional thinking nor wandering but rather an automatic response in your mind

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> John has quiet time at home and wants to just relax, but he can't stop his mind ... the events of the day.
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Using *Reflect and Review* make the thinking seem voluntary when I am trying to convey the involuntary aspect of it.

Answer: 
Words that can fit

[regurgitate](http://www.dictionary.com/browse/regurgitate)

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> verb (used with object)
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> 2.
>  to cause to surge or rush back; vomit.
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> 3.
>  to give back or repeat, especially something not fully understood or assimilated:
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*assimilate*

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> 1. take in and understand fully (information or ideas).
>  "Marie tried to assimilate the week's events"
> 2. (of the body or any biological system) absorb and digest (food or nutrients).
>  "the sugars in the fruit are readily assimilated by the body"
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There is not a single word in existence that describes this action of the mind. Automatic reflection may be a useful description.