Hue - the dimension of color that is determined by the wavelength of light. Wavelength - the distance from the peak of one light or sound wave to the peak of the next. In sensation, the transforming of stimulus energies, such as sights, sounds, and smells, into neural impulses our brains can interpret. *Transduction - conversion of one form of energy into another. *Sensory Adaptation - diminished sensitivity as a consequence of constant stimulation. *Weber's Law - states that the difference threshold is directly proportional to the magnitude of the stimulus with which the comparison is being made. *Difference Threshold - the minimum difference between two stimuli required for detection 50 percent of the time. Subliminal - below one's absolute threshold for conscious awareness. Assumes there is no single absolute threshold and detection depends partly on a person's experience, expectations, motivation, and level of fatigue. *Signal Detection Theory - a theory predicting how and when we detect the presence of a faint stimulus ("signal") amid background stimulation ("noise"). *Absolute Threshold - the minimum stimulation needed to detect a particular stimulus 50 percent of the time. Psychophysics - The study of relationships between the physical characteristics of stimuli, such as their intensity, and our psychological experience of them. *Top-Down Processing - information processing guided by higher-level mental processes, as when we construct perceptions drawing on our experience and expectations. *Bottom-Up Processing - analysis that begins with the sensory receptors and works up to the brain's integration of sensory information. *Perception - the process of organizing and interpreting sensory information, enabling us to recognize meaningful objects and events. *Sensation - the process by which our sensory receptors and nervous system receive and represent stimulus energies from our environment.
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