Psychology 1101Chapter4 - Psychology1101 Chapter4 Page130

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Psychology 1101 Chapter 4 Page 130 Visual agnosia-an inability to recognize objects through sight. As Dr. P’s case illustrates, without effective processing of sensory input, our  familiar world can become a chaos of bewildering sensations. Sensation-stimulation of sense organs. This involves the absorption of energy,  such as light or sound waves, by sensory organs, such as the eyes and ears. Perception-selection, organization, and interpretation of sensory input. This  involves organizing and translating sensory input into something meaningful. Psychophysics-the study of how physical stimuli are translated into psychological  experience. Sensation begins with a stimulus Page 131 Threshold-dividing point between energy levels that do and do not have a  detectable effect. Absolute threshold-minimum stimulus intensity that an organism can detect Absolute thresholds define the boundaries of an organism’s sensory capabilities. A just noticeable difference (JND) is the smallest difference in stimulus intensity  that a specific sense can detect. In general, as stimuli increase in magnitude, the JND between them becomes  larger.
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Signal-detection theory proposes that the detection of stimuli involves decision  processes as well as sensory processes, which are both influenced by a variety of  factors besides stimulus intensity. Page 132 Noise comes from all the irrelevant stimuli in the environment and the neural  activity they elicit. Noise is analogous to the background static on a radio station. The more noise in  the system, the harder it will be for you to pick up a weak signal. Subliminal perception-the registration of sensory input without conscious  awareness Page 133 Subliminal stimulation generally produces weak effects. These effects can be  detected only by very precise measurement, under carefully controlled laboratory  conditions Sensory adaptation is a gradual decline in sensitivity to prolonged stimulation. Page 134 Sensory adaptation is an automatic, built-in process that keeps people turned in to  the changes rather than the constants in their sensory input. It allows people to  ignore the obvious. Light is a form of electromagnetic radiation that travels as a wave, moving,  naturally enough, at the speed of light. Amplitude—height Wavelength-distance between peaks Saturation-relative amount of whiteness in a color
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Page 135 The eyes serve two main purposes: they channel light to the neural tissue that  receives it, called the retina, and they house that tissue. The lens is the transparent eye structure that focuses the light rays falling on the 
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This note was uploaded on 02/02/2011 for the course PSYC 1101 taught by Professor Crystal during the Spring '08 term at University of Georgia Athens.

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Psychology 1101Chapter4 - Psychology1101 Chapter4 Page130

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