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PSYC 100 (176)
Chapter 4

Chapter 4

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PSYC 100
Russell Day

PSYC 100 SENSATION AND PERCEPTION 4 S ENSORY P ROCESSES Synesthesia: Mixing of the senses Sensation: Stimulus detection where sense organs translate to the brain Perception: Giving meaning to what we sense Psychophysics: Study of characteristics between stimuli and sensory capabilities T HRESHOLD D ETECTIONS Absolute Threshold: Lowest intensity which a stimulus can be detected 50% of the time Difference Threshold: Smallest difference between 2 stimuli that people can perceive 50% of the time Signal Detection Theory: Factors that influence sensory judgments Decision Criterion: Standard of how present a stimulus must be before people can detect it Subliminal Stimulus: A weak stimulus received by the senses, but cannot be perceived consciously Webers Law: States: The difference threshold (jnd) is directly proportional to the magnitude of the stimulus with which the comparison is being made, can be expressed as Weber Fraction Sensory Adaption: Diminishing sensitivity to an unchanging stimulus The Sensory Systems Transduction: Process where the characteristics of a stimulus are converted into nerve impulses Lens: Elastic structure which becomes thinner to focus on distant objects and thicker to focus on nearby objects Retina: Light sensitive tissue at the rear of eyeball Myopia: Nearsightedness www.notesolution.com
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