Ch. 4 Outline Sensation sensation a process by which our sensory receptors and nervous system receive and represent stimulus energy the information that we get Perception a process of organizing and interpreting sensory information, enabling us to recognize meaningful objects and events process of info we receive Bottom-Up Processing analysis that begins with the sense receptors and works up to the brain?s integration of sensory information Top-Down Processing information processing guided by higher-level mental processes as when we construct perceptions drawing on our experience and expectations Sensation- basic principles Psychophysics study of the relationship between physical characteristics of stimuli and our psychological experience of them Absolute Threshold