A behind-the-scenes blog about research methods at Pew Research Center. For our latest findings, visit pewresearch.org. Pew Research Center sometimes employs cognitive interviewing to help improve ...

Add Yahoo as a preferred source to see more of our stories on Google. WASHINGTON — Presumptive Democratic nominee Joe Biden shrugged off a question Tuesday about taking a cognitive assessment test, ...

The president again tried to defend his own mental fitness for office — and disparage Joe Biden’s — by frequently repeating a memory sequence: “Person. Woman. Man. Camera. TV.” By Katie Rogers ...

There has been much talk about the cognitive abilities of Trump as he has struggled recently to speak clearly at press conferences and has spent many hours posting on social media late at night. The ...

In his first televised interview since his widely criticized debate performance last week, President Joe Biden would not commit to taking a cognitive or neurological test and releasing the results.