Exam 2 Review

Exam 2 Review - Dr Don S Christensen Psych 100 Shoreline...

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Dr. Don S. Christensen Shoreline Community College Psych 100 Psychology Exam 2 Potential Short Answer Questions 1. Define the concept of sensation. When our sensory receptors detect physical energy from the environment and translate it into neural signals. 2. Define the concept of perception. The process of organizing and interpreting sensory information, enable us to recognize meaningful objects and events. 3. What’s the difference between bottom-up and top-down processing? Which of these concepts is most strongly associated with the process of sensation and which is most strongly associated with perception? Bottom-up: Information processing that is strongly shaped by adding up the inputs of sensory receptors, stronger to sensation . Top-down: Information processing that is strongly shaped by higher level mental processes (ex. expectations of beliefs), stronger to perception . 4. What is an absolute threshold? How do psychologists go about determining an absolute threshold for a sense such as hearing or sight? -The smallest possible amount of a stimulus that can be detected half (50%) of the time. -Psychologists let people stand on top of a mountain and hold a candle 30 miles away to determine the absolute threshold for sight; and for hearing they expose each of your ears to vary sound levels. So for each of your senses, that 50-50 recognition point defines your absolute threshold. 5. What is a subliminal stimulus? (Be sure to refer to the concept defined in the previous question) Below one’s absolute threshold for conscious awareness. 6. What is the technical definition of a difference threshold and how is it related to Weber’s law? The minimum difference between two stimuli required for detection 50% of the time. It’s related to Weber’s law in that it’s stated to be perceived as different, two stimuli must differ by a constant minimum percentage (rather than constant minimum amount). 7. What is sensory adaptation? Diminished sensitivity to unchanged stimulus, you couldn’t feel it anymore. 8. What are two physical properties of waves? In other words, what are two ways that waves can vary? (See figure 5.4) Wavelength- The distance from on wave peak to the next, determines its hue (color we experience, such as blue or green), also the shorter the wavelength is the higher frequency it is. Intensity- The amount of energy in light waves (determined by amplitude), influences intensity of colors and sounds. 9. What do we experience visually when the two properties identified in the previous question change in the light we are seeing? What do we hear when the two properties identified in the previous question change in the sounds we are hearing? (See figure 5.4) Short wavelength = high frequency (bluish colors, high –pitched sounds) Long wavelength = low frequency (reddish colors, low-pitched sounds) Great amplitude- Bright colors, loud sounds Small amplitude- Dull colors, soft sounds 10. What two different types of receptor cells (or sensory receptors) are located in the eye?
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This note was uploaded on 07/27/2010 for the course PSYCH 100 taught by Professor Donchristenson during the Spring '10 term at Shoreline.

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Exam 2 Review - Dr Don S Christensen Psych 100 Shoreline...

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