The visual pathway
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The document summarizes the two main visual pathways in the brain - the dorsal and ventral pathways. The dorsal pathway projects from the occipital lobe to the parietal lobe and is involved in spatial processing and visually guided actions. The ventral pathway projects from the occipital lobe to the temporal lobe and is responsible for object recognition and memory formation. It clusters visual information into categories like faces, bodies, and objects. Major output pathways from the ventral pathway include connections to the amygdala, medial temporal lobe, orbitofrontal cortex, and ventrolateral prefrontal cortex.
The visual pathway
- 1. The visual pathway Domina Petric, MD
- 2. Introduction Cortical visual processing is commonly thought to proceed along two distinct pathways: • dorsal pathway projecting into parietal cortex • ventral pathway projecting into temporal cortex
- 3. Dorsal visual pathway The dorsal pathway is an occipitoparietal network that lies between early visual cortex and specialized cortical structures involved in: • visually-guided action • somatosensation • spatial audition • navigation • spatial working memory
- 4. Dorsal visual pathway The dorsal pathway specializes in capturing arbitrary and dynamic spatiotemporal relationships between multiple items.
- 5. Ventral visual pathway • It is an occipitotemporal network that bridges the early visual cortex and specialized cortical and subcortical structures involved in various forms of memory and learning, specifically habit formation, emotion, long- term and short-term memory, reward, and value. • These structures are involved in forming specific representations or associations involving stable aspects of visual information.
- 6. Ventral visual pathway Processing of object quality: • inclusive term meant to capture the wide variety of stable visual information that can be processed as the basis of these associations • processing of the features or perceptual dimensions (e.g. shape, color, size, brightness) that are available in the information passed to striate cortex from the retina
- 7. Clustering One of the most consistent findings regarding the intrinsic function of the occipitotemporal network is the presence of functional clustering in cortex with selectivity for particular object categories: • body parts • faces • scenes • objects • tools • written words • color
- 8. Major subcortical and cortical output pathways from the occipitotemporal network are: • cortico-subcortical output pathways • occipitotemporo-neostriatal pathway • occipitotemporo-ventral striatum pathway • occipitotempo-amygdaloid pathway • cortico-cortical output pathways • occipitotemporo-medial temporal pathway • occipitotemporo-orbitofrontal pathway • occipitotemporo-ventrolateral prefrontal pathway
- 10. Literature: • Kravitz DJ, Saleem KS, Baker CI, Ungerleider LG, Mishkin M. The ventral visual pathway: An expanded neural framework for the processing of object quality. Trends in cognitive sciences. 2013;17(1):26-49. doi:10.1016/j.tics.2012.10.011. • http://www.keywordsuggests.com