What is the difference between ventral stream and dorsal stream?
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.
What is the lateral group in the dorsal stream?
The lateral group in the dorsal stream consists of areas MT, MTc, MST, and FST. Area MT is the second main target of V1 projections (after V2), and is an oval-shaped area located near the limit between the occipital and temporal lobes.
What does dorsal and ventral mean in anatomy?
The terms dorsal and ventral are also often used to describe the relative location of a body part. For example, the stomach is ventral to the spinal cord, which means that the stomach is located in front of the spinal cord. What is the difference between dorsal and ventral?
Where do dorsal-stream accounts of speech come from?
Finally, let us consider dorsal-stream accounts that take their inspiration from motor control theories of speech and appendicular movement that feature feedforward–feedback control and “internal forward models” ( Wolpert et al., 1995; Guenther et al., 2006; Ventura et al., 2009 ).
What are the function of ventral and dorsal stream?
They argued that the ventral stream is involved in the perception of information about objects (vision for perception) and the dorsal stream processes information to guide actions (vision for action).
What is the dorsal stream in the brain?
The dorsal stream, or where pathway, describes a hierarchy of areas that support visually-guided behaviors and localizing objects in space. It involves two main groups of areas, which receive separate, strong projections from V1.
What is the dorsal stream in psychology?
a series of cortical maps that originate in the striate cortex (primary visual cortex) of the occipital lobe and project forward and upward into the parietal lobe. Known informally as the “where” or “how” pathway, the dorsal stream is involved in processing object motion and location in space.
What happens if 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)
Where does the dorsal stream go?
It describes two information processing streams originating in the occipital cortex, dorsal (which goes to parietal cortex) and ventral (which goes to temporal cortex), which exhibit relative specialization in object recognition (what) and spatial vision (where).
What is the difference between the dorsal and ventral visual streams?
The occipital and parietal lobes of the human brain include two visual processing streams, a ventral one more involved in object recognition, and a dorsal one for spatial-, attention-, and action-related processes.
What is dorsal stream dysfunction?
Dorsal Stream Dysfunction is an umbrella term for a group of cerebral visual impairments degrading the way vision is created for us in a part of the brain called the posterior parietal lobes.
What is ventral visual stream?
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 it is located
The dorsal stream (also known as the parietal stream or the " where " stream) stretches from the primary visual cortex (V1) in the occipital lobe forward into the parietal lobe. It is interconnected with the parallel ventral stream (the " what " stream) which runs downward from V1 into the temporal lobe.
General features
The dorsal stream is involved in spatial awareness and guidance of actions i.e. reaching. In this it has two distinct functional characteristics-it contains a detailed map of the visual field, and is also good at detecting and analysing movements.
Effects of damage or lesions
Damage to the posterior parietal cortex causes a number of spatial disorders including:
External links
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What is the difference between the dorsal and ventral visual streams?
The idea of a division between a dorsal and a ventral visual stream is one of the most basic principles of visual processing in the brain ( Milner and Goodale, 1995 ). 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. 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 of the spatial location, shape, and orientation of objects. It has been proposed, however, that the dorsal stream also processes tools as a category, so that manipulable objects would be processed by those brain regions that are important for the execution of actions. However, because dorsal and ventral visual regions are heavily interconnected, it is difficult to tell in healthy subjects whether information is processed along the dorsal stream only, or whether it is fed to parietal cortex via ventral visual regions.
Does CFS affect the ventral brain?
These findings can also be embedded in a more general context. Recently, it has been shown that not only dorsal, but also ventral visual areas may exhibit preserved unconscious processing under CFS ( Sterzer et al., 2008 ). Furthermore, behavioral evidence indicates that unconscious priming extends to images that are assumed to be processed along the ventral stream ( Barbot and Kouider, 2012 ). For those reasons, the apparent dissociation between dorsal and ventral visual brain regions brought about by CFS does not seem to hold, and it can therefore be questioned whether the study by Sakuraba et al. (2012) successfully isolated dorsal stream processes. However, because this claim was based on selective unconscious processing of tools ( Fang and He, 2005; Almeida et al., 2008 ), the findings of Sakuraba et al. (2012) demonstrate that such seemingly high-level effects may be explained by basic visual properties such as elongation.
What are the most important facts to know about dorsal and ventral?
These terms can also be referred to as posterior and anterior surfaces. Ventral and dorsal can be used to describe the position of organs in relation to one another. For example, one could say, “The small intestine is ventral to the kidneys”, which means the small intestine is in front of the kidneys. These anatomical terms can also describe different body cavities. The dorsal cavity contains the spinal cord, central nervous system, and spinal column, whereas the ventral cavity consists of the thoracic, abdominal, and pelvic cavities.
What is the difference between ventral and dorsal?
In general, ventral refers to the front of the body, and dorsal refers to the back. These terms are also known as anterior and posterior, respectively.
What is the ventral cavity?
On the anterior side of the body, the ventral cavity is made up of the thoracic cavity, abdominal cavity, and pelvic cavity. The thoracic cavity contains the heart, lungs, breast tissue, thymus gland, and blood vessels. Inside the abdominal cavity are the stomach, liver, gallbladder, pancreas, small intestine, colon, appendix, and kidneys.
What are the dorsal and ventral cavities?
What are the dorsal and ventral body cavities? The dorsal and ventral body cavities, two of the largest body compartments in humans, are anatomical spaces that contain various organs and other structures. The dorsal cavity lies close to the spine in the posterior portion of the body. The dorsal cavity contains the spinal column, ...
What is the paired anatomical term for the ventral and dorsal?
The anatomical position of a human body is defined as a body standing upright with the head facing forward, arms down at the sides with the palms turned forward, and feet parallel facing forward.
What is the ventral location of the stomach?
For example, the stomach is ventral to the spinal cord, which means that the stomach is located in front of the spinal cord.
Where is the dorsal cavity located?
The dorsal cavity lies close to the spine in the posterior portion of the body. The dorsal cavity contains the spinal column, central nervous system (i.e., brain and spinal cord), and meninges (i.e., tissue that surrounds the brain and spinal cord).
