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CU Denver - PSYC 1000 - Class Notes - Week 5

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CU Denver - PSYC 1000 - Class Notes - Week 5

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background image Intro to Psych  September 19,  2016 Chapter 4: Sensation and Perception Sensation- detection of energy, sense organs detect physical energy
Perception- how the brain interprets the signal
1. Sensation a. Transduction- stimuluselectric signal
b. Sense receptor- specialized cell
c. Sensory adaptation- when we have a high activation when we 
first notice  the signal but over time  ex. Traffic noise after first moving into a house next to the  high way  but after living there for several years it  becomes background noise 2. Psychophysics Fechner invented/discovered a. Absolute threshold i. Lowest level of stimuli that we can detect 50% of the  time b. Just noticeable difference (JNB) i. The smallest change we can detect c. Weber’s Law i. The proportional relationship between JNB and original  intensity
d. Signal detection theory
i. Signal-to-noise ratio It is hard to find a signal if there is lots of noise ii. Response biases If stimulus is present and the response is “Yes”true  positive If stimulus is present and the response is “No” false  negative  (miss) If stimulus is absent and the response is “Yes”false  positive  (false alarm) If stimulus is absent and the response is “No”true  negative  (correct rejection) e. Specific nerve energies i. There are many different stimuli but how we receive  them depends  on receptors ii. Phosphine- receptor cells in our eyes f. McGurk Effect
g. Synesthesia
i. When people’s senses cross
background image ex. See sound, taste colors 3. Attention a. Selective attention- focusing on one stimulus, ignoring others i. Cocktail party effect- when you hear your name you  automatically  tune in to that conversation b. Unintentional blindness i. Ignoring stimuli that is right in front of you because your  focus is on  something else c. Change blindness i. Fail to detect changes in the environment d. Binding Problem-how our brains combine stimuli into a whole i. Rapid processing 4. Light a. Visible light i. 400-700 nanometers b. Terms i. Brightness- intensity of color
ii. Hue- color of an object
iii. Additive- when you mix lights together
iv. Subtractive- when you mix pigments
5. The Eye a. Myopia i. Near sightedness, you can see up close, you cannot see  far away b. Hyperopia i. Far sightedness, you can see far away, you cannot see up close 6. Shapes and Contour a. Different cells respond to different types of stimuli
b. Feature detector cells- detect features, lines and edges
i. Simple cells- slits in a specific orientation and location
ii. Complex cells- slits in a specific orientation
7. Color Perception a. Trichromatic theory- based on three primary colors: blue,  green and red

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School: University of Colorado Denver
Department: Psychology
Course: Introduction to Psychology
Professor: Alex Northcutt
Term: Fall 2016
Tags: Cognitive Psychology
Name: 9/19 Intro to Psych Chapter 4 Notes
Description: These notes cover chapter 4 discussing sensation and perception.
Uploaded: 09/19/2016
3 Pages 11 Views 8 Unlocks
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