Chapter 05 test slides

Chapter 05 test slides - Sensation Perception To represent...

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1 To represent the world,  we must first detect  physical energy   (stimulus) from the environment and convert it into neural  signals in our brain.  This is a process called  sensation .  For  example, we pick up sound waves (stimulus) and then we hear  a noise in the basement. When we select, organize, and interpret our sensations, the  process is called  perception.    For example, we interpret the  noise in the basement as the furnace kicking on and not  someone “breaking in.” Task of Each Sense :       1.  To receive stimulus energy; 2.  To transform stimulus energy into neural signals; 3.  To send these neural messages to the brain.       7
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8 Bottom-up Processing An analysis of the stimulus (e.g., a sound)  begins with  the sense receptors and “works its way up” to the  level of the brain and mind.    Bottom-up processing  starts at entry level (the sense  receptors) and works up to the brain. The letter “A” is really composed of three black lines.   But we see or perceive how these lines are arranged.   So first we “perceive” these lines, and then we  “think”  and  “interpret” them as being the letter, “A.”
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9 Top-Down Processing Top-down processing  starts at the brain .  It is  information  processing guided by our higher-level mental processes.  W e construct our perceptions . We draw on  our own  experiences,   expectations, and cognitions  (from our own  brain) to engage in top-down processing.   What is the second letter in each word?? T H E C H T
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14 Thresholds What stimuli cross our threshold for conscious awareness? Absolute Threshold:   Minimum stimulation needed to detect a  particular stimulus  50% of the time.  It is the amount of a  stimulus that can be detected  50% of the time.   It is a  arbitrary number. Proportion of “Yes” Responses 0.00                 0.50                1.00              0            5            10           15          20          25                            Stimulus Intensity (lumens)
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15 Subliminal  Threshold Subliminal Threshold:   is  a point at which  stimuli 
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Chapter 05 test slides - Sensation Perception To represent...

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