Amid concerns about Biden's mental acuity, experts reveal how cognitive tests work and what they reveal

After President Biden's lackluster debate performance sparked renewed concerns about his mental acuity, both sides of the political spectrum have been clamoring for him to take a cognitive test. Biden has not seen a neurologist, but did undergo his annual physical exam in February, Dr. Kevin O'Connor, physician for the president, said in a July 8 statement from the White House. The doctor reiterated that Biden's physical exam did not reveal concerns about a neurological disorder. In a recent interview with George Stephanopoulos, Biden remained noncommittal about formal cognitive testing, noting, "I have a cognitive test every single day" -- meaning by performing his duties as president of the United States. Many Americans, however, have wanted greater transparency.