Chapter 4,5,6 Vocab Flashcards Preview

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Flashcards in Chapter 4,5,6 Vocab Deck (294)
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156

Dual-Opponent Color Cells

Monkey visual cortex ; Responds with vigorous on firing when the center of their circular receptive field is illuminated with one wavelength (such as green) and the surround is simultaneously illuminated with another wavelength (red)

157

Cytochrome Oxidase

Mitochondrial enzyme- their distribution in the primary visual cortex can be visualized if one stains slices of tissue with stains that have an affinity for this enzyme

158

Blobs


Peglike, cytochrome oxidase-rich, dual-opponent color columns

159

Secondary Visual Cortex

Those that receive most of their input from the primary visual cortex

160

Visual Association Cortex

Those that receive input from areas of secondary visual cortex as well as from the secondary areas of other sensory systems

161

Prestriate Cortex

Band of tissue in the occipital lobe that surrounds the primary visual cortex

162

Inferotemporal Cortex


Cortex of the inferior temporal lobe

163

Posterior Parietal Cortex

Areas of association cortex that receive visual input that is located in several parts of the cerebral cortex

164

Scotoma

An area of blindness that occurs from damage to an area of the primary visual cortex

165

Perimetry Test

Patient’s head is held motionless on a chin rest, the patient stares with one eye at a fixation point on the screen—press a button when the dot is seen

166

Hemianopsic


'

Having a scotoma covering half of the visual field; May see an entire face when they focus on the persons nose, even when the side of the face in the scotoma has been covered by a blank card

167

Conscious Awareness

you assume that if a person sees something, he or she will be consciously aware of seeing it

168

Blindsight

Ability of such patients to respond to visual stimuli in their scotomas even though they have no conscious awareness of the stimuli

169

Dorsal Stream

Flows from the primary visual cortex to the dorsal prestriate cortex to the posterior parietal cortex; Responds to spatial stimuli—location of objects and their direction of movement'


170

Ventral Stream

Flows from the primary visual cortex to the ventral prestriate cortex to the inferotemporal cortex; Responds to the characteristics of objects—color and shape, for example

171

“Where” vs. “What” Theory



damage to some areas of the cortex may abolish certain aspects of vision while leaving others unaffected—come from the comparison of the specific effects of damage to the dorsal and ventral streams; dorsal stream is involved in the “where” and ventral is involved in the “what”

172

"Control of Behavior” versus “Conscious

Perception” Theory - the function of the dorsal stream is to direct behavioral interactions with objects, whereas the function of the ventral stream is to mediate the conscious perception of the objects

173

Prosopagnosia

Visual agnosia for faces

174

Agnosia

Failure of recognition that is not attributable to a sensory deficit or to verbal or intellectual impairment




175

Visual Agnosia

A specific agnosia for visual stimuli; Can see visual stimuli, but do not know what they are

176

Movement Agnosia

Difficulties in recognizing movement

177

Object Agnosia



Difficulties in recognizing objects

178

Color Agnosia

Difficulties in recognizing colors
Fusiform Face Area - Damage to the ventral stream in the area of the boundary between the occipital and temporal lobes; Parts of this area are selectively activated by human faces

179

Akinetopsia

Deficiency in the ability to see movement progress in a normal smooth fashion
Triggered by high doses of certain antidepressants