Sensation_And_Perception

Sensation And Perception Sensation and Perception Interactive Lectures Sensation is the detection and direct experience of physical energy as a result of environmental or internal events. Perception is the process by which sensory impulses are organized and interpreted. Our Sensational Senses Sensation begins with the sense receptors, which convert the energy of a stimulus into electrical impulses that travel along nerves to the brain. Separate sensations can be accounted for by anatomical codes (as set forth by the doctrine of specific nerve energies) and functional codes in the nervous system. In a rare condition called synaesthesia, sensation in one modality evokes a sensation in another modality, but these experiences are the exception, not the rule. Psychologists specializing in psychophysics have studied sensory sensitivity by measuring absolute and difference thresholds. Signal-detection theory, however, holds that responses in a detection task consist of both a sensory process and a decision process and will vary with the person’s motivation, alertness, and expectations. Our senses are designed to respond to change and contrast in the environment. When stimulation is unchanging, sensory adaptation occurs. Too little stimulation can cause sensory deprivation. Too much stimulation can cause sensory overload, which is why we exercise selective attention. Vision Vision is affected by the wavelength, visual, sensory, brain, perception, pain, cells, senses, different, cues, vision, receptors, perceptual, information, esp, about, world, theory, taste, smell, sense, retina, respond, receptor, produce, pressure, one, neural, light, influences, include, evidence, differences, both, view, types