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Lecture 2

Lecture 2 Notes

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Matthias Niemeier

PSYB51 24 September, 2010 Lecture 2: The First Steps in Vision Short Answer Question (Sample) on info learned from last lecture! - Method of constant stimuli - Method of Limits - Method of adjustment - Magnitude estimation ------ - Light = an electromagnetic wave - Very short spectrum of VISIBLE LIGHT (to humans) - Colours is psychology [COLOUR PERCEPTION] In 90728415K8L.8,% $%;,$% (Colour is something that is created by the visual system) ------ - Light can be absorbed, diffracted...: these principles apply to the entire 0O0.9742,J309L.850.97:2,O9K4:JKZ0OO-014.:8L3J43ISIBLE LIGHT 1) - Ex: shining light on a black surface = most of the light will be gone as in ABSORBED - Ex: Filters [ABSORB LIGHT!] = greenblueyellowred filters = these filters only let through light of wavelength that we perceive as greenblueyellow or red respectively - so all the other wavelengths are reduced probably not completely filtered out www.notesolution.comPSYB51 24 September, 2010 - so in a green filter: everythinJL8,-847-0,31LO90704:90[.059147J7003 wavelengths [green light] 2) Diffracted: - For waves of all sorts L940839K,;094-0OLJK9 3) Reflected: - Happens with mirrors and glass surfaces - Happens on an object = some light absorbed while some is reflected - Ex: brown desk some brown[dark orange] wavelengths reflected back = so you view desk as brown - Purkinie eye-tracking system: these reflection on the eye These reflections (P1 P2 P3...etc) arise from different optical surfaces of the eye [outer and inner surface] In total: 4 types of reflections on the cornea as well as on the lens behind them Now these reflection viewed from front they look like little spots So you measure the position of these light spots on your camera and then you can determine the eye-position [where the eye is looking at] 4) Transmitted: - Ex: Solar Panels = so it does not only absorb light energy but transforms it to something else ELECTRICAL ENERGY! 5) Refracted: Ex: depth of pool looks less deep than it really is! - So what kind of information do we get from light? So vision helps us identify what we can or cannot eat and perhaps even FIND it [FOOD] in the first place Differentiate between different shapes [if you like bananas vs. Apples] = so shape perception [you can do that with your eyes!] You can recognize individuals [people] that are your friends and family <4:,O84Z,3994-0,-O09470.4J3L]04:70302L08-> e.g. unfriendly dogs! = you want to be able to perceiveDANGER!
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