Joe Biden his cognitive issues and why he believes Tuesday is Thursday

The thesis of cognitive penetrability of perception states that the content of perceptual experience can be influenced by prior or concurrent psychological factors, such as beliefs, fears and desires. 

I just know that is my wife beside  me...eh it's your sister Joe'

Advocates of this thesis could, for instance, claim that your desire to have a wife beside you might influence your perception, so that she appears to be there
 

Although cognitive penetrability of perception is a controversial empirical hypothesis, it does not appear implausible. The possibility of its veracity has been cited in order to challenge positions that maintain that perceptual experience has inherent justifying power

So Jo perceives and he believes that his perception has inherent justifying power
If one perceives it to be Tuesday this perception is confidently asserted and when informed it is Thursday, one still thinks it is Tuesday because one cognition as computed it so.
No doubt Joe will be elected as the next President of the United States'Now were the the hell is that Nuclear Button, misplaced the god damn thing...'