Doctors worldwide have used their expertise to speculate about the mental fitness of President Joe Biden following his numerous freezes and gaffes during the first debate of the 2024 general election.

Beginning within the first 15 minutes of Thursday’s debate against former President Donald Trump, Biden, 81, uttered a string of incoherent responses and froze several times. His performance led prominent Democratic strategists to comment at the end of the event that senior players in the party are very concerned with the president’s condition.