Occipital Lobes

Mind Map by , created almost 6 years ago

PSYB65 Mind Map on Occipital Lobes, created by andreaarose on 12/10/2013.

Created by andreaarose almost 6 years ago
Frontal lobes
Chapter 27 Flashcards
Chapter 25/28 Flashcards
2.1.4 Data Representation
Lavington ICT
a christmas carol
Parietal Lobes Flashcards
Temporal lobes
Parietal lobes
Temporal Lobes Flashcards
The Occipital Lobes
Occipital Lobes
1 Subdivisions
1.1 Area V1
1.1.1 Laminar organization most distinct of all cortical areas
1.2 Striate cortex
1.2.1 Also visual cortex - striate = striped appearance
1.3 Color vision
1.3.1 Primary job of V4, but distributed through the occipital cortex
2 Connections of the visual cortex
2.1 Primary visual cortex (V1)
2.1.1 Input from LGN
2.1.2 Output to all other levels
2.2 Secondary visual cortex (V2)
2.2.1 Output to all other levels
2.3 After V2
2.3.1 Output to the parietal lobe - dorsal stream
2.3.2 Output to the inferior temporal lobe - ventral stream
2.3.3 Output to the superior temporal sulcus (STS) - STS stream
2.4 Visual pathways
2.4.1 Dorsal stream Visual guidance of movements
2.4.2 Ventral stream Object perception
2.4.3 STS Visuospatial functions (body oriented)
3 A theory of occipital lobe function
3.1 Vision begins in V1 that is heterogenous, and then travels to more specialized cortical zones
3.2 Selective lesions up the hierarchy produce specific visual deficits
3.3 Visual functions beyond the occipital lobe
3.3.1 Vision related areas in the brain make up 55% of the total cortex Multiple visual regions in the temporal, parietal and frontal lobes
3.3.2 Vision Not unitary, composed of many specific forms of processing Vision for action Parietal visual areas in the dorsal stream Reaching, ducking and catching Visual recognition Temporal lobes Object recognition Visual space Parietal and temporal lobes Spatial location Location of an object relative to person (egocentric space) Location of an object relative to another (allocentric space) Disorders of visual pathways Monocular blindness Loss of sight in one eye Results from destruction of the retina or optic nerve Bitemporal hemianopia Loss of vision from both temporal fields Results from a lesion to the optic chiasm Nasal hemianopia Loss of vision of one nasal field Results from a lesion of the lateral chiasm Homohemianopia Blindness of one entire visual field Results from a complete cut of the optic tract, LGN or V1 Macular sparing Sparing of the central or macular region of the visual field Results from a lesion to the occipital lobe Quadrantoanopia/hemianopia Complete loss of vision in 1/4 of the fovea or in 1/2 of the fovea. Results from a lesion to the occipital lobe Visual agnosia Object agnosia Apperceptive agnosia Deficit in the ability to develop a percept of the structure of an object Simultagnosia Unable to perceive more than one object at a time Results from bilateral damage to the lateral parts of the occipital lobes Associative agnosia Can perceive objects, but cannot identify them Results from lesions to the anterior temporal lobes Other agnosias Prosopagnosia Cannot recognize faces Can recognize facial features, facial expressions and tell human form from non human faces Alexia Inability to read Form of object agnosia Inability to construct perceptual wholes from parts Form of associative agnosia Word memory is damaged or inaccessible Results from damage to the left fusiform and lingual areas
4 Imaging studies of dorsal and ventral streams
4.1 Haxby and colleagues
4.1.1 PET study
4.1.2 Found activation for facial stimuli in the temporal region Also activation during a location task in the posterior parietal regions and frontal lobes
4.1.3 Detection of motion activated V5 Detection of shape activated STS
4.1.4 Colour perception activated area V4
5 Visual imagery
5.1 RH superiority in mental rotation
5.2 Left temporal-occipital region is responsible for image generation

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