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PSYB51H3 (306)
Chapter 2

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Department
Psychology
Course
PSYB51H3
Professor
Rimma Teper
Semester
Winter

Description
Psyb51 textbook Notes Sensation and PerceptionChapter 2The first steps in Vision From Light to Neural SignalsA little Physics Light is a form of electromagnetic radiation energy produced by vibrations of electrically charged materialWave an oscillation that travels through a medium by transferring energy from one particle or point to another without causing any permanent displacement of the mediumphoton a quantum of visible light or other form of electromagnetic radiation demonstrating both particle and wave propertiesabsorb To take up light noise or energy and not transmit it at allscatter to disperse light in an irregular fashionlight being treated as being made up of waves when it moves around the world and being made up of photons when it is absorbedVisible light waves have wave lengths between 400 and 700nmreflected To redirect something that strikes a surfaceespecially light sound or heatusually back toward its point of originLight that is neither reflected nor absorbed by the surface is transmitted through the surfaceIf we are gazing at our star through a window as light travels from air into the glass some of light rays will be bent or refracted light bendingas it is transmitted Refraction also occurs when light passes from air water or into the eyeballEyes That See LightAn eye can form an image of the outside world enabling animals that possess to use light to recognize objects not just to determine whether light is present and what direction its coming The first tissue that light from the star will encounter is the corneacornea the transparentwindow into the eyeball The cornea provides a window to the world because it is a transparentthat is most light photons are transmitted through it rather than being reflected or absorbedThe cornea has a rich supply of transparent sensory nerve endings which are there to force the eyes to close and produce tears if the cornea is scratched preserving its transparencytransparent allowing light to pass through with no interruption so that objects on the other side can be clearly seenThe aqueous humour a fluid derived from blood fills the space immediately behind the cornea supplying oxygen and nutrients to and removing waste from the cornea and the crystalline lens Like the cornea the lens has no blood supply so that it can be completely transparentTo get to the lens the light from our star must pass through the pupil which issimply a hole in a muscular structure called the iris
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