Chapter 4,5,6 Vocab Flashcards Preview

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Flashcards in Chapter 4,5,6 Vocab Deck (294)
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96

Intensity

Plays an important role in the perception of brightness

97

Brightness

intensity

98

Sensitivity

The ability to detect the presence of dimly lit objects

99

Acuity

The ability to see the details of objects

100

Retina

Part of the eye where the image falls on (upside down)

101

Pupil

Light enters through here- the hole in the iris
Iris and the muscles that gives our eye the color

102

Ciliary Muscles

The tension in the ligaments holding each lens in place

103

Accommodation

The process of adjusting the configuration of the lenses to bring images into focus on the retina

104

Converge

Eyes that turn slightly inward; Greatest when you are inspecting things that are close

105

Binocular Disparity

The difference in the position of the same image on two retinas; Can construct 3 dimensional perception

106

Receptors

One of the five layers composing the retina; Specialized to receive chemical, mechanical, or radiant signals from the environment

107

Horizontal Cells


Type of retinal neurons whose specialized function is lateral communication

108

Bipolar Cells


Form the middle layer of the retina

109

Amacrine Cells

Type of retinal neurons whose specialized function is lateral communication

110

Blind Spot

The gap in the receptor layer for the bundle of retinal ganglion cell axons to leave the eye

111

Fovea

Indentation, about .33 centimeters, at the center of the retina

112

Completion



Filling in; The visual system uses information provided by the receptors around the blind spot to fill in the gaps in your retinal image

113

Surface Interpolation

The process by which we perceive surfaces; The visual system extracts information about edges and from it infers the appearance of large surfaces


114

Cones

Visual receptors in the retina that mediate high acuity (ability to see details) color vision in good lighting

115

Rods

Visual receptors in the retina that mediate achromatic, low acuity vision under dim light


116

Duplexity Theory

Theory that cones and rods mediate different kinds of vision

117

Photopic Vision


Gone mediate vision; Predominates in good lighting and provided high-acuity colored perceptions of the world

118

Scotopic Vision

dim illumination—there is not enough light to reliably excite the cones; more sensitive than photopic & lacks detail and color; rod mediated

119

Nasal Hemiretina

The half of each retina next to the nose

120

Temporal Hemiretina

The half next to the temples

121

Spectral Sensitivity Curve



Graph of the relative brightness of lights of the same intensity presented at different wavelength

122

Photopic Spectral Sensitivity Curve

Photopic spectral sensitivity of humans can be determined by having subjects judge the relative brightness of different wavelengths of light shone on the fovea; A light at 500 nm would have to be much more intense that one at 560 nm to be equally bright

123

Scotopic Spectral Sensitivity Curve

Can be determined by asking subjects to judge the relative brightness of different wavelengths of light shone on the periphery of the retina at an intensity too low to activate the few peripheral cones that are located there

124

Purkinje Effect

In intense light, red and yellow wavelengths look brighter than blue or green wavelengths of equal intensity; in dim light, blue and green wavelengths look brighter than red and yellow wavelengths of equal intensity



125

Fixational Eye Movements

Our eyes continuously moving