1 Sensation and Perception. 2 Sensation & Perception How do we construct our representations of the external world? To represent the world, we must detect.

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Presentation transcript:

1 Sensation and Perception

2 Sensation & Perception How do we construct our representations of the external world? To represent the world, we must detect physical energy (a stimulus) from the environment and convert it into neural signals. This is a process called sensation. When we select, organize, and interpret our sensations, the process is called perception.

3 Bottom-up Processing Analysis of the stimulus begins with the sense receptors and works up to the level of the brain and mind. Letter “A” is really a black blotch broken down into features by the brain that we perceive as an “A.”

4 Top-Down Processing Information processing guided by higher-level mental processes as we construct perceptions, drawing on our experience and expectations. THE CHT

5 Our sensory and perceptual processes work together to help us sort out complex images. Making Sense of Complexity “The Forest Has Eyes,” Bev Doolittle

6 Transduction In sensation, the transformation of stimulus energy into neural impulses. Example: Phototransduction: Conversion of light energy into neural impulses that the brain can understand.

7 Psychophysics A study of the relationship between physical characteristics of stimuli and our psychological experience with them. Physical World Psychological World LightBrightness SoundVolume PressureWeight SugarSweet

8 No Detection Intensity Absolute Threshold Detected Yes No Observer’s Response Tell when you (the observer) detect the light.

9 Thresholds Absolute Threshold: Minimum stimulation needed to detect a particular stimulus 50% of the time. Proportion of “Yes” Responses Stimulus Intensity (lumens)

10 Difference Threshold Difference Threshold: Minimum difference between two stimuli required for detection 50% of the time, also called just noticeable difference (JND). Difference Threshold Tell when you (observer) detect a difference in the light. No Observer’s Response NoYes

11 Weber’s Law Two stimuli must differ by a constant minimum percentage (rather than a constant amount), to be perceived as different. Weber fraction: k =  I/I.

12 Signal Detection Theory (SDT) Predicts how and when we detect the presence of a faint stimulus (signal) amid background noise (other stimulation). SDT assumes that there is no single absolute threshold and detection depends on: Person’s experience Expectations Motivation Level of fatigue Carol Lee/ Tony Stone Images

13 Signal to Noise Ratio Signal/Noise Signal/Noise

14 SDT Matrix Decision YesNo Signal PresentHitMiss AbsentFalseAlarm Correct Rejection The observer decides whether she hears the tone or not, based on the signal being present or not. This translates into four outcomes.

15 Sensory Adaptation Diminished sensitivity as a consequence of constant stimulation. Put a band aid on your arm and after awhile you don’t sense it.

16 Subliminal Perception sensing without awareness sensing without awareness is it possible? is it possible? can it be used for persuasion? can it be used for persuasion?

17 RED SOX TICKETS

18 Perception in Brain Our perceptions are a combination of sensory (bottom-up) and cognitive (top-down) processes.

19 Other Important Senses The sense of touch is a mix of four distinct skin senses—pressure, warmth, cold, and pain. Bruce Ayers/ Stone/ Getty Images

20 Skin Senses Only pressure has identifiable receptors. All other skin sensations are variations of pressure, warmth, cold and pain. Burning hot PressureVibration Cold, warmth and pain

21 Pain Pain tells the body that something has gone wrong. Usually pain results from damage to the skin and other tissues. A rare disease exists in which the afflicted person feels no pain. Ashley Blocker (right) feels neither pain nor extreme hot or cold. AP Photo/ Stephen Morton

22 Biopsychosocial Influences

23 Gate-Control Theory Melzak and Wall (1965, 1983) proposed that our spinal cord contains neurological “gates” that either block pain or allow it to be sensed. Gary Comer/ PhototakeUSA.com

24 Pain Control Pain can be controlled by a number of therapies including, drugs, surgery, acupuncture, exercise, hypnosis, and even thought distraction. Todd Richards and Aric Vills, U.W. ©Hunter Hoffman,