Sensation and perception are hard to separate, because people automatically start organizing incoming sensory stimulation the moment it arrives.
	For theory and research, however, the distinction between the two is useful.
	Sensation is the stimulation of sense organs, for example, absorbing energy from light by the eyes.
	Perception is the selection, organization, and interpretation of sensory input; or translating the sensory input into something meaningful.
	Look at a photo of a rose in your text, your eyes sense the light reflecting from the page; what you perceive, however, is the picture of the rose.
	Psychophysics is the study of how physical stimuli are translated into psychological experience, thus psychologists in this area are interested mainly in sensation and perception.