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Consumer Behaviour Perceptions Jnd Essay Preview: Consumer Behaviour Perceptions Jnd Report this essay Case 4.1: Packaging and the J.N.D. Concept of Perception, Sensation, Webers Law (J.N.D. or Differential Threshold) Perception is the process of attaining awareness or understanding of the environment. This is through organizing and interpreting sensory information to form a meaningful and clear.