 For example, already Abelard raised the question whether the concept or mental image, which we may identify in the diagram as the objective concept of later authors, should be identified with the act of thought, which we may identify as the subjective concept, or perhaps a further act of the mind, called formatio, namely, the potential intellect’s act of forming the concept, using the intelligible species as the principle of its action. Such distinctions were later on severely criticized by authors such as John Peter Olivi and others, who argued for the elimination of intelligible species, and, in general, of any intermediaries between an act of the intellect and its ultimate objects, the singulars conceived in a universal  manner.[42]