Myers PSYCHOLOGY Seventh Edition in Modules

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Presentation transcript:

Myers PSYCHOLOGY Seventh Edition in Modules Introduction to Sensation and Perception James A. McCubbin, Ph.D. Clemson University Worth Publishers

Sensation Sensation the process by which our sensory receptors and nervous system receive and represent stimulus energy Perception the process of organizing and interpreting sensory information, enabling us to recognize meaningful objects and events

Sensation Our sensory and perceptual processes work together to help us sort out complex images

Sensation Bottom-Up Processing Top-Down 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

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

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)

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

Sensation- Thresholds 25 50 75 100 Low Absolute threshold Medium Intensity of stimulus Percentage of correct detections Subliminal stimuli Subliminal when stimuli are below one’s absolute threshold for conscious awareness

Sensation- Thresholds Weber’s Law to be perceived as different, two stimuli must differ by a constant minimum percentage (rather than a constant amount) light intensity- 8% weight- 2% tone frequency- 0.3%

Sensation- Thresholds Sensory Adaptation diminished sensitivity as a consequence of constant stimulation Selective Attention focusing of conscious awareness on a particular stimulus as in the cocktail party effect

Now you see it, now you don’t!

Perception Selective Attention

Change Blindness