From the time of writing Structure of Behavior and Phenomenology of Perception, Merleau-Ponty wanted to show, in opposition to the idea that drove the tradition beginning with John Locke, that perception was not the causal product of atomic sensations. This atomist-causal conception was being perpetuated in certain psychological currents of the time, particularly in behaviourism. According to Merleau-Ponty, perception has an active dimension, in that it is a primordial openness to the life world (to the 'Lebenswelt')

This primordial openness is at the heart of his thesis of the primacy of perception. The slogan of the phenomenology of Edmund Husserl is "all consciousness is consciousness of something", which implies a distinction between "acts of thought" (the noesis) and "intentional objects of thought" (the noema). Thus, the correlation between noesis and noema becomes the first step in the constitution of analyses of consciousness.

However, in studying the posthumous manuscripts of Husserl, who remained one of his major influences, Merleau-Ponty remarked that, in their evolution, Husserl's work brings to light phenomena which are not assimilable to noetic-noematic correlation. This is particularly the case when one attends to the phenomena of the body (which is at once body-subject and body-object), subjective time (the consciousness of time is neither an act of consciousness nor an object of thought) and the other (the first considerations of the other in Husserl led to solipsism).

The distinction between "acts of thought" (noesis) and "intentional objects of thought" (noema) does not seem, therefore, to constitute an irreducible ground. It appears rather at a higher level of analysis. Thus, Merleau-Ponty does not postulate that "all consciousness is consciousness of something", which supposes at the outset a noetic-noematic ground. Instead, he develops the thesis according to which "all consciousness is perceptual consciousness". In doing so, he establishes a significant turn in the development of phenomenology, indicating that its conceptualisations should be re-examined in the light of the primacy of perception, in weighing up the philosophical consequences of this thesis.

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