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Lecture

Lecture 4

4 Pages
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Department
Psychology
Course Code
PSY100H1
Professor
Dan Dolderman

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Description
LECTURE 4January 25 2010 Sensation and Perception Perception In a word as long as the first and last letters are in the right place order doesnt matterour minds dont read every letter by itself but the word as a wholePsychophysics Sensation is the stimulation of sense organsPerception is the selection organization and interpretation of sensory inputwhat we choose to highlightignore etcbased on geneticsculturebelief system occurs instantaneouslyThresholdsSensory receptors vibrations in the air that we can hear are tuned to a particular form of energyauditory receptors in the ear code for sound pressure changes not for light Sensory systems require a minimum amount of energy for activation absolute thresholdJustnoticeable difference JND minimum difference in stimulation that is just noticeableJNDs a fraction of the original stimulus intensity diff for diff sensesThe Visual System The eye detects electromagnetic radiation lightvision is functionalallows for detection of movement predator or prey allows for detection of colour ripe or spoiledLight detection is useful becauselight travels rapidly no delay unlike hearinglight travels in straight lines no distortion light interacts with the surface of objects in the environment is reflected or absorbedVision is the most important sense for humanshow we gather food and eat were visual huntergatherers We dont hunt by smell like other species do but by vision looking at thingsElectromagnetic SpectrumConstantly bombarded by these coloursour naked eye isnt available to see infrared spectrum and ultravioletwe can only see the visible spectrum Roy G Bivcolours in order on the wavelength red orange yellowviolet Advantage of seeing in the visibleweve adapted to this spectrum most facilitated to our brain and eyes to see properly and at our bestother species have adapted to their own environments so theyve adapted differently to see in other spectrums some can see in the ultraviolet spectrum etc
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