Conversation

"This is really itchy. Better scratch it. GAH! Oh bother, now I need to salve it. Uh. Still stings. Maybe I shouldn't scratch that." Etc.
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Thought-as-sensation injects a new signal into the loop, disrupts it. Funny thing is you can often feel the trigger that amplifies the loop.
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Thought triggers bellyaching anxiety (oft perceived as thought) triggers reflexive self-judgement (tightening of facial muscles) triggers...
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But when perceived this way, it's sometimes so fucking funny that you can't help but laugh/snort/shake your head, and it breaks the pattern.
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Thought felt as sensation doesn't particularly incite to further thought on its own. A cascade eventually reaches a definitive end point.