A form of bias affecting even those attempting neutrality, where an observer (a journalist, a reviewer, a judge) subconsciously filters information to only register data that confirms their pre-existing narrative or desired outcome. They believe they're being fair, but their perception has a "spot" that's blind to inconvenient facts. This is especially dangerous because the observer's perceived impartiality lends false credibility to their skewed interpretation.
Example: A journalist covering a polarizing protest aims for neutrality. However, due to Observer Blind SpotBias, they only see and report on the handful of violent acts by one side, framing the entire event as a riot, while their blind spot prevents them from even noticing the peaceful majority and the provocative actions of police, crafting a "balanced" report that's subtly biased.
When a friend or bro is responsible for telling his friend or bro what he said and did the night before, when the subject being observed is presumably 'shit-faced' or 'fucked up'.
A Designated Observer may tell his bro about a conversation he had with an attractive female he was trying to 'score with' or 'tap'.
When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.