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The Occipital Lobes
Fichas del conjunto (34)
- 1Area V1Laminar organization most distinct of all cortical areas.
- 2Striate cortexAnother name for visual cortex due to its striped appearance
- 3Color visionPrimary job of V4, but distributed throughout occipital cortex
- 4Primary visual cortex (V1)Input from LGN, output to all other levels.
- 5Secondary visual cortex (V2)Output to all other levels.
- 6Dorsal streamOutput to the parietal lobe, visual guidance of movements
- 7Ventral streamOutput to the inferior temporal lobe, object perception
- 8STS streamOutput to the superior temporal sulcus (STS), visuospatial functions (body oriented).
- 9A theory of occipital lobe functionVision begins in V1 (primary visual cortex), that is heterogeneous, and then travels to more specialized cortical zones.
- 10Lesions to the occipital lobeSelective lesions produce specific visual deficits. Lesions to V1 - not aware of seeing
- 11Visual regionsMake up about 55% of the total cortex, multiple visual regions in the temporal, parietal, and frontal lobes
- 12VisionNot unitary, composed of many quite specific forms of processing
- 13Vision for actionParietal visual areas in the dorsal stream, reaching, ducking and catching.
- 14Visual recognitionTemporal lobes and object recognition.
- 15Visual spaceParietal and temporal lobes - determines spatial location.
- 16Egocentric spaceLocation of an object relative to person
- 17Allocentric spaceLocation of an object relative to another
- 18Haxby and colleaguesPET study. Found activation for facial stimuli in the temporal region and activation during a location task in the posterior parietal region and frontal lobes. Detection of motion activated V5, while detection of shape activated the STS. Colour perception activated area V4.
- 19Monocular blindnessLoss of sight in one eye, results from destruction of the retina or optic nerve
- 20Bitemporal hemianopiaLoss of vision from both temporal fields, results from a lesion to the optic chiasm
- 21Nasal hemianopiaLoss of vision of one nasal field, results from a lesion of the lateral chiasm
- 22Homonymous hemianopiaBlindness of one entire visual field, results from a complete cut of the optic tract, LGN or V1
- 23Macular sparingSparing of the central or macular region of the visual field, results from a lesion to the occipital lobe
- 24Quadrantoanopia or hemianopiaComplete loss of vision in one-quarter of the fovea or in one-half of the fovea, lesion to the occipital lobe
- 25ScotomasSmall blind spots that result from small lesions to the occipital lobes.
- 26Apperceptive agnosiaDeficit in the ability to develop a percept of the structure of an object, bilateral damage to the lateral parts of the occipital lobes.
- 27SimultagnosiaUnable to perceive more than one object at a time.
- 28Object agnosiaApperceptive agnosia, associative agnosia and simultagnosia.
- 29Associative agnosiaCan perceive objects, but cannot identify them, results from lesions to the anterior temporal lobes
- 30ProsopagnosiaCannot recognize faces but can recognize facial features, expressions, and tell human from nonhuman faces.
- 31AlexiaInability to read, results from damage to the left fusiform and lingual areas
- 32Alexia as a form of object agnosiaInability to construct perceptual wholes from parts
- 33Alexia as a form of associative agnosiaWord memory is damaged or inaccessible
- 34Visual imageryRight hemisphere superiority in mental rotation, evidence that the left temporal-occipital region is responsible for image generation
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- PSYB65 Fichas sobre The Occipital Lobes, creado por andreaarose el 17/12/2013.
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- andreaarose
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