This text explores the fundamental distinction between perception and experience, identifying their temporal scope and historicity as the primary differentiating factors. While a perception is always particular and tied to a specific moment (whether present or remembered), experience is inherently historical, constructed through repeated perceptions. The author argues that perception only acquires "meaning" when situated within a broader experiential context; without this background, a perception cannot possess significance. The document further examines the lowest forms of perception, defined as sensitivity or reactivity—the basic capacity of a subject to respond to environmental stimuli. These primordial forms of receptivity are difficult to access directly and are assumed when moving beyond causalism toward an explanation based on reactivity. Ultimately, the work clarifies the relationship between individual perception, the historicity of experience, and the subject's fundamental reactivity, which serves as the foundation for any meaningful engagement with the surrounding environment.