Chapter5Overview - Myers PSYCHOLOGY Sensation Chapter5...

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Myers’ PSYCHOLOGY Chapter 5    Sensation
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Sensation Sensation a process by which our sensory  receptors and nervous system receive  and represent stimulus energy Perception a process of organizing and interpreting  sensory information, enabling us to  recognize meaningful objects and  events
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Sensation Our  sensory  and  perceptual  processes  work  together to  help us  sort out  complext  processes
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Sensation Bottom-Up Processing analysis that begins with the sense receptors  and works up to the brain’s integration of  sensory information Top-Down Processing information processing guided by higher-level  mental processes as when we construct perceptions drawing on  our experience and expectations
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Sensation- Basic Principles Psychophysics study of the relationship between  physical characteristics of stimuli and  our psychological experience of them Light -  brightness Sound -  volume Pressure -  weight Taste -  sweetness
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Sensation- Thresholds Absolute Threshold    minimum stimulation needed to detect a  particular stimulus 50% of the time Difference Threshold minimum difference between two stimuli  required for detection 50% of the time just noticeable difference (JND)
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Sensation- Thresholds Signal Detection Theory predicts how and when we detect the presence  of a faint stimulus (signal) amid background  stimulation (noise) assumes that there is no single absolute  threshold detection depends partly on person’s experience expectations motivation level of fatigue
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Sensation- Thresholds Subliminal When stimuli are  below one’s  absolute  threshold for  conscious  awareness 0 25 50 75 100 Low Absolute threshold Medium Intensity of stimulus Percentage of correct detections Subliminal stimuli
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Sensation- Thresholds Weber’s Law -  to perceive as different,    two stimuli must differ by a constant  minimum percentage light intensity-  8% weight-  2% tone frequency-  0.3% Sensory adaptation -  diminished  sensitivity as a consequence of constant  stimulation
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Vision- Stabilized Images on the Retina
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Chapter5Overview - Myers PSYCHOLOGY Sensation Chapter5...

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