Slip-ups like Joe Biden's misnaming of Trump and Harris are common, and usually caused by lack of sleep or stress, experts say

"In short: US President Joe Biden has been criticised after accidentally referring to his vice-president, Kamala Harris, as 'vice-president Trump'.

"Neuroscientists say it is very common to accidentally misname someone or something.

"The brain groups names which are related or sound similar and can draw on the wrong one under stress or when lacking sleep."

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"Could misnaming be an early sign of cognitive decline?

"Neuroscientist Damian Holsinger from the University of Sydney specialises in Alzheimer's disease and said it would be unfair to assume Mr Biden is in a state of cognitive decline based only on naming slip-ups.

"'There is no correlation,' he said.

"'This is probably aged-related memory decline, not dementia.'"