What do the dorsal and ventral streams do?
From their model, the ventral stream processes visual information for the purpose of visual perception (“vision for perception”), while the dorsal stream processes visual information for the purpose of executing movements (“vision for action”).
What is dorsal language stream?
The dorsal stream is involved in sound to motor speech transformations, while the ventral stream supports sound/letter to meaning. Data-driven theories on the role of these streams during atypical speech and language development are lacking.
What is the ventral stream responsible for?
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.
What does the dorsal pathway do?
a pathway that carries visual information from the primary visual cortex to the parietal lobe.
Where does the dorsal stream project to?
From the early visual areas, the ventral stream runs to the inferotemporal cortex, whereas the dorsal stream projects to the posterior parietal cortex.
What happens when the dorsal stream is damaged?
Dorsal damage can cause: Trouble with spatial perception and perception of complex movement. Trouble with spatial orientation and navigation. Impaired spatial guidance of motor activities (saccadic and pursuit eye movements; reaching, grasping and pointing; walking over steps; navigating crowds and obstacles)
What happens when the ventral stream is damaged?
Patients with damage to the ventral stream are typically unable to perceive the size, shape, and orientation of objects. Remarkably, however, some of these patients continue to show normal preshaping and rotation of the hand when they reach out to grasp the very objects whose forms they fail to see.
What is the dorsal ventral axis?
The dorsal/ventral axis is defined by a line that runs orthogonal to both the anterior/posterior and left/right axes. The dorsal end is defined by the upper or back side of an organism. The ventral end is defined by the lower or front side of an organism.
Why is the temporal lobe important?
The temporal lobes are also believed to play an important role in processing affect/emotions, language, and certain aspects of visual perception. The dominant temporal lobe, which is the left side in most people, is involved in understanding language and learning and remembering verbal information.
What does the parietal lobe do?
The parietal lobes contain the primary sensory cortex which controls sensation (touch, pressure). Behind the primary sensory cortex is a large association area that controls fine sensation (judgment of texture, weight, size, and shape).
Where does the ventral Stream project to?
The ventral stream (also known as the “what pathway”) leads to the temporal lobe, which is involved with object and visual identification and recognition.
Where are the dorsal and ventral streams?
The ventral stream originates in primary visual cortex and extends along the ventral surface into the temporal cortex; the dorsal stream also arises in primary visual cortex, but continues along the dorsal surface into parietal cortex.
