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Midterm- Textbook Chapter 5 Notes You dont need to read textbook! Just read this! I took this course on 2010. Guaranteed A in this midterm. Ch.5) Sensation, Perception, and Attention

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Dan Dolderman

Sensation Perception and Attention Ch5 Sensation How sense organs respond to external stimuli and transmit the responses to the brainPerception The processing organization and interpretation of sensory signals that result in an internal representation of the stimulus Stimulus Must Be Coded to Be Understood by the BrainSensory coding The way that sensory organs translate a stimuluss physical properties into neural impulsesTransduction A process by which sensory receptors produce neural impulses when they receive physical or chemical stimulationSensation coding can be divided into two categoriesQuantitative factors such as intensity brightness and loudness often indexed by the neural firing frequencyQualitative factors such as colour or taste different receptors Psychophysics Relates Stimulus to ResponseSensory thresholdsAbsolute threshold The minimum intensity of stimulation that must occur before one can experience a sensationDifference threshold The minimum amount of change required in order to detect a difference between intensities of stimuliSignaldetection theoryConcept of an absolute threshold was flawed people sometimes believed they saw a weak stimulus when there was none and sometimes failed to detect a stimulus that was presentedSensory detection theory Detecting a stimulus requires making a judgment about its presence or absence based on a subjective interpretation of ambiguous infoHit Signal is presented and the observer detects itMiss Failed to detectFalse alarm No signal and observer erroneously detects a signalCorrect rejection Signal is absent and the observer denies having seen itSensory AdaptationSensory adaptation When an observers sensitivity to stimuli decreases over time In Gustation Taste Buds Are Chemical DetectorsGustationSense of tasteTaste buds Sensory receptor that transducer taste infoDifferent taste buds are spread relatively uniformly throughout the tongue and mouth
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