PSYCH 2010 Lecture Notes - Lecture 8: Radiant Energy, Color Vision, Information Processing

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1 Sep 2015
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2/20/14
Psychology Notes- Day 11 (Ch. 6)
Sensation and Perception
Sensation and Perception:
How do we construct our representations of the external world?
Sensation:
oDetect physical energy (a stimulus) from the environment and convert it into
neural signals (What the 5 senses do)
Perception:
oWhen we select, organize, and interpret our sensations (what the brain does)
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.”
Top-Down Processing:
Information processing guided by higher-level mental processes as we construct
perceptions, drawing on our experience and expectations
Making Sense of Complexity
Our sensory (bottom-up) and perceptual (top-down) processes work together to help us
sort out complex images
We can see “faces” in the rocks and trees in the picture. This is due to top-down
processing
Vision:
Light’s physical properties are perceived in specific waves
oWavelength = HUE (COLOR)
oAmplitude = INTENSITY (BRIGHTNESS)
The Stimulus (Light Waves):
1. Wavelength (Color)
oMeters or nanometers
o“Short” ~ violet ~ 400 nm
o“Long” ~ red ~ 700 nm
2. Amplitude (intensity/brightness)
oPower of intensity of the radiant energy
Eye:
Cornea
Pupil
oAdjustable opening where light enters the eye
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