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Lecture 4

PSYC 101 Lecture Notes - Lecture 4: Occipital Lobe, Electromagnetic Radiation, Stroop EffectPremium

2 pages72 viewsSpring 2017

Course Code
PSYC 101
Pearlberg Steven

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Bottom up vs. Top down processing:
o Bottom Up -
Data driven
Stimulus becomes more complex as processes further
Process begins with simple elements
Elements combine
o Top Down -
Conceptually driven
Begins with active search for order
Based on previous knowledge
Searched for elements associated with that knowledge
Stroop Task - "Green" written in blue ink (example)
Psychophysics - Relationship between attributes of the physical world and your
psychological evidence of them
Sensory Thresholds - Level of energy required to activate that sense
o Absolute threshold: smallest amount of energy that can be detected by a system (50%
of the time)
The 5 senses - Ex: vision - a candle flame from 30 mi. away
o Difference Threshold: the smallest difference to notice a stimulus change
Can change within a person overtime and as a result of hormone status
Olfactory sensitivity during pregnancy
Ability to taste food as we get older
The Electromagnetic Spectrum and Visible Light -
o Ranges from comic rays, through x-rays, and ultraviolet light, to TV and radio waves
Vision -
o External light falls on receptors to generate the visual message
o Light = Electromagnetic radiation
Retina - Perceptual cells which transfer to (occipital lobe) of brain
Fovea - Focus
1/2 of brain is involved in visual processing - mostly occipital lobe, but other parts of
brain are also needed for understanding.
Photo Receptors - Light sensitive cells found within the retina - 100 million receptors
per eye
Rods -
Sensitive to light
Under low-light conditions
Not color
Cones -
Mostly in fovea
Sensitive to color
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