What is the visual pathway and where?
The visual pathway begins with photoreceptors in the retina and ends in the visual cortex of the occipital lobe. The photoreceptors are cells of two types: rods and cones. Rods play a special role in peripheral vision and in vision under low light conditions.
What pathway is the ventral pathway?
a pathway that carries visual information from the primary visual cortex to the temporal lobe. According to one widely-accepted hypothesis, the ventral stream (so named because of the path it takes along the ventral side of the brain) carries information related to object form and recognition.
Where is the pathway in the brain?
According to one widely-accepted hypothesis, the dorsal stream (so named because of the path it takes along the dorsal side of the brain) carries information related to movement and spatial relationships between objects in the visual field. It is sometimes called the “where” pathway. See also: ventral stream.
What is happening in the dorsal visual pathway?
Definition. The dorsal visual pathway is a functional stream originating in primary visual cortex and terminating in the superior parietal lobule that is responsible for the localization of objects in space and for action-oriented behaviors that depend on the perception of space.
What is the difference between the dorsal and ventral visual streams?
The ventral stream (or “vision-for-perception” pathway) is believed to mainly subserve recognition and discrimination of visual shapes and objects, whereas the dorsal stream (or “vision-for-action” pathway) has been primarily associated with visually guided reaching and grasping based on the moment-to-moment analysis …
Where is the primary visual cortex located?
What is dorsal stream damage?
Damage impairs visual guidance of movement (optic ataxia) and visual search. A specific disorder of dorsal stream dysfunction is emerging, comprising difficulty handling the complexity of a visual scene (of varying degree) with impaired visual guidance of the limb movement (optic ataxia).
What is the difference between the ventral and dorsal pathways?
Where is the dorsal visual pathway?
Dorsal visual pathway: this pathway extends from the primary visual cortex (V1) in the occipital lobe to the parietal lobe. The dorsal pathway is subdivided by the intraparietal sulcus (IPS) into several main sectors including the superior parietal lobule, inferior parietal lobule, and the supramarginal gyrus.
What visual deficit may damage to the parietal lobe result in?
Both disorders of neck and extraocular muscle proprioception, and disorders leading to asynchronous input along the two optic nerves are ‘peripheral’ causes of impaired visually guided movement, while bilateral damage to the parietal lobes can result in central impairment of visually guided movement, or optic ataxia.
What is the dual stream model?
The Dual Stream model of speech/language processing holds that there are two functionally distinct computational/neural networks that process speech/language information, one that interfaces sensory/phonological networks with conceptual-semantic systems, and one that interfaces sensory/phonological networks with motor- …
What is the visual area?
Introduction. The visual cortex is the primary cortical region of the brain that receives, integrates, and processes visual information relayed from the retinas. It is in the occipital lobe of the primary cerebral cortex, which is in the most posterior region of the brain.
What is a visual module?
Visual modularity is a conceptualization of visual function that maintains that the various properties that comprise visual perception (form, color, texture, motion, etc.) are the by-product of separate processes that occur in distinct cortical or subcortical regions of the brain (Calabretta & Parisi, 2005).
What does the primary visual area do?
The primary visual cortex is the most studied visual area in the brain. In mammals, it is located in the posterior pole of the occipital lobe and is the simplest, earliest cortical visual area. It is highly specialized for processing information about static and moving objects and is excellent in pattern recognition.
What are the association areas?
The parietal, temporal, and occipital lobes, all located in the posterior part of the cortex, organize sensory information into a coherent perceptual model of our environment centered on our body image.
Why are the association areas so important?
parts of the cerebral cortex that receive inputs from multiple areas; association areas integrate incoming sensory information, and also form connections between sensory and motor areas.