The document discusses the dynamics of perception from three aspects: perceptual selection, organization, and interpretation. It focuses on perceptual selection, which involves consumers selectively attending to environmental stimuli based on three main factors: the nature of the stimulus, their previous experiences, and their motives. Consumers filter stimuli through selective exposure, selective attention, perceptual defense, and perceptual blocking mechanisms. They tend to notice stimuli that confirm their beliefs and fulfill their needs, while ignoring threatening or irrelevant information.