occipital and temporal lobes
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1
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why is visual information processing in the brain considered heirarchial ?
* the complexity of visual information increases as we move away from the retina
* different types of neurons also process different properties of visual stimuli
* different types of neurons also process different properties of visual stimuli
2
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importance of the extrastriate cortex
* located in the occipital lobe
* contains V2 - V5
* neurons in this region process the global properties of a visual scene, rather than the component properties
* contains V2 - V5
* neurons in this region process the global properties of a visual scene, rather than the component properties
3
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properties of the dorsal stream of visual information processing
* responsible for visuo-spatial and visuo-motor processing
* located in the posterior parietal lobe
* located in the posterior parietal lobe
4
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properties of the ventral stream of visual information processing
* responsible for abject analysis/recognition
* located in the inferior temporal lobe
* located in the inferior temporal lobe
5
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Milner and Goodale (1998)
* provided key evidence for the location of the ventral and dorsal streams
* found that patients with lesions in the occipito-temporal areas showed severe visual agnosia (deficits in visual perception), but were still able to act on visual stimuli
* also found that patients with lesions in the posterior-parietal lobe were able to recognise objects but could not perform visually guided actions
* found that patients with lesions in the occipito-temporal areas showed severe visual agnosia (deficits in visual perception), but were still able to act on visual stimuli
* also found that patients with lesions in the posterior-parietal lobe were able to recognise objects but could not perform visually guided actions
6
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importance of the inferior temporal cortex in visual perception and memory
* inferior temporal cortex receives input from the extrastriate cortex and is the final stage of processing in the ventral stream
* neurons in this region respond very selectively to specific shapes and objects
* these neurons respond to their specific objects/shapes regardless of size, orientation, etc
* activity of these neurons is sustained in the absence of the visual stimulus, implicating that they play a role in short term memory
* neurons in this region respond very selectively to specific shapes and objects
* these neurons respond to their specific objects/shapes regardless of size, orientation, etc
* activity of these neurons is sustained in the absence of the visual stimulus, implicating that they play a role in short term memory
7
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what role does the medial temporal lobe play in visual processing ?
* is at the end of the visual processing hierarchy
* combines inputs from both dorsal and ventral stream
* also receives input from other sensory modalities (auditory, olfactory, etc)
* these combined inputs allow it to produce elaborate visual representations
* combines inputs from both dorsal and ventral stream
* also receives input from other sensory modalities (auditory, olfactory, etc)
* these combined inputs allow it to produce elaborate visual representations
Note 
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