quinas' account of singular sensory and universal intellectual representation is crucial in one of his main arguments for the immateriality of the intellect. However， it had been challenged by Scotus， Ockham and Buridan.I argue that their objections to Aquinas' account are untenable. I also show that，contrary to what Robert Pasnau claims， Aquinas' argument does not have to commit “the content fallacy.” Finally， I explain why Buridan has to accept the main implication of Aquinas' argument， even though he actually rejects that implication．