 Others, however, such as La Mettrie and Diderot, regarded Cheselden’s account as wholly ambiguous in its implications. They pointed out that it was possible that the boy had been unable to make valid perceptual judgments because his eyes had not been functioning properly. They suggested that this could have been due to the fact that his eyes had not been used for a long time, or to their not having had enough time to recover from the operation. They pointed out that Cheselden had, perhaps, asked the boy leading questions. Some philosophers also believed that the results of the inquiry depended on the intelligence of the patient.