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Lecture

Vision 1

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Department
Psychology
Course
PSYCO104
Professor
Blaine Mullins
Semester
Fall

Description
Psychology Chapter 4: Vision Chapter 4: Vision Chapter 4: Vision 1 Senses: Vestibular Sensation- sense of balance/upright (ear) CHEMICAL=TCS(skin)/Olafaction(smell)/Gustation(taste) chemical sensors SOMATIC=Mechanical(skin), Pain, Temperate Vision 2. Light Important properties of light 1. Length: Hue (or colour) 2. Amplitude: Brightness 3. Purity: Saturation (richness of colour) 2 1. Light Properties of light •Length: Hue (or colour) •Amplitude: Brightness •Purity: Saturation (richness) 3 Light Different wavelengths of light is our experiences of color- HUE=WAVELENGHTS Blue- 2100 nanometers 2. Anatomy of the eye • Cornea: covers iris & pupil protecting it from dust, etc. Acts as a lens, aiding in focus of light. • Lens: transparent structure focuses light. • Pupil: dark aperture in lens that determines how much light enters the eye. • Zonule fibers: ligament attached to & pulls on lens. • Aqueous humour: clear watery fluid secreted into anterior chamber. 4 Cornea- does most of refractive work (can tear with contacts). ZF- attached to lens, help us focus 2. Anatomy of the eye • Accommodation: adjustment of shape of lens to compensate for distance of object from retina. ‣ Zonule fibers: looking at something distant ‣ Elastic force in lens: looking at something close 5 -Focus on the back of eye ZF- pull on the lens, make it focus. Cillary muscles relax, XF flatten, inc focus EF- shorter distant, Cillary muscle contract and ZF thicken, 2. Anatomy of the eye • Vitreous humour: thick gelatinous substance between lens & retina. • Retina: layer of cells lining back of eye, detects light & sends signals to brain. • Macula: small spot on retina where acuity is very good. • Fovea: small pit w/n macula, only cones, best acuity. • Optic nerve: connects eye to brain. 6 AH-- watery, CH- more gelly, thin layer of cell at back of cells. Light energy transformed into neuron pulse. Fovea contains only cons- high visual acuity, see things in great detail. Where your looking. 2. Anatomy of the eye Taken June 04, 2011 from: http://www.google.ca/imgres?imgurl=http://pavtechnologies.com/pavwordpress/wp-content/uploads/2009/02/human-eye-2.jpg&imgrefurl=http://pavtechnologies.com/pavwordpress/%3Fcat%3D16&usg=__vKZEyC0sTGWnX_-7ih2zLEnw638=&h=265&w=315&sz=38&hl=en&start=19&zoom=1&tbnid=UCbBNWf2UsulLM:&tbnh=161&tbnw=191&ei=5FbqTe6TCczbiAKcnIx_&prev=/search%3Fq%3Dhuman%2Beye%26um%3D1%26hl%3Den%26client%3Dsafari%26sa%3DN%26rls%3Den%26biw%3D1172%26bih%3D517%26tbm%3Disch&um=1&itbs=1&iact=hc&vpx=888&vpy=135&dur=3007&hovh=206&hovw=245&tx=144&ty=115&page=3&ndsp=9&ved=1t:429,r:4,s:19&biw=1172&bih=517 7 Know the anatomy 3. Anatomy of the eye 8 9 2. Anatomy of the eye •Vitreal floaters: debris too large for phagocytic consumption. 10 Dead cells floating around cell. Casts a shadow- u detect shadow How far we can see depends on how far light travels. You can see as far as light can touch your cons- no limit. 3. The retina Rods Horizontal Bipolar Amacrine Ganglion Cones cells cells cells cells 11 RODS/CONS- photo receptors, last layer that light detects Gangl
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