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The Visual System and Brightness
Transcript of The Visual System and Brightness
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ill Retinal Luminance: ammountant of light falling on the retina 1 candella / m^2 seen through pupil of 1 mm^2 area Subjective Impressions brightness :impression of the amount of light emitted lightness : impression of reflected light as a portion of total light "whiteness" Why is it necessary to distinguish between subjective and objective meaures of light and brightness? Photometic Units Light from a direct source vesus light from an indirect source The amount of light from a single "standard candle" Spectral Colours: a single wave length Attributes:
Each wave adds to the others
The eventual sum is white Subtractive
each pigment reduced the light being relected back
The eventual sum is dark grey or black Brightness Dark Adaptation Spatial Contex The rapid depolarization of the spike potential is caused by sodium ions flowing into the cell. Visual accommodation-: focusing of the lens through a change in shape. The retina is composed of three neural layers of cells as well as of two types of cells that have lateral connections.
These layers are arranged as follows: rods and cones; horizontal cells; bipolar cells; amacrine cells; ganglion cells. When a molecule of the pigment rhodopsin absorbs light it becomes photopsin.
The end effect on the rod resulting from the absorption of light by the photopigments is a neural action potential. Ways to study Neural Function