As visual information exits the occipital lobe, and as sound leaves the phonological network, it follows two main pathways, or “streams”. … The dorsal stream (or, “where pathway”) leads to the parietal lobe, which is involved with
processing the object’s spatial location relative to the viewer and with speech repetition
.
Why is the dorsal pathway called the Where pathway?
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.
What are the what and where pathways?
In the currently prevailing view, the different maps are organised hierarchically into two major pathways, one involved in recognition and memory (the
ventral stream
or ‘what’ pathway) and the other in the programming of action (the dorsal stream or ‘where’ pathway).
What is the dorsal stream pathway?
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. The lateral group in the dorsal stream consists of areas MT, MTc, MST, and FST.
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 …
What is the pathway of the brain?
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. It is sometimes called the “what” pathway.
What is the Parvocellular pathway?
The parvocellular pathway from the small retinal ganglion cells
carries all colour information
and is effective in carrying high contrast black-and-white information. The nerve fibres are thin and thus the speed of transfer is low.
What is the difference between path and pathway?
“Path” is the route that one takes to get from point A to point B. A “pathway”
must lead somewhere
, but that “somewhere” is not necessarily a physical location. Eg, a pathway to enlightenment, a pathway to mastering English.
What is the purpose of pathway?
Purpose Pathways require students to think differently about their education – instead of following a specific path determined by the institution, they are
empowered to construct their own path and identify institutions and experiences that help them move forward on it
.
What is the vision pathway?
The two-streams hypothesis is a model of the neural processing of vision as well as hearing. … The
ventral stream
(also known as the “what pathway”) leads to the temporal lobe, which is involved with object and visual identification and recognition.
What does damage to dorsal stream do?
If either the dorsal or ventral stream is damaged, this leads to
dissociable behavioural deficits
. For example, patients with optic ataxia have lesions in parietal areas, which are part of the dorsal stream. They have deficits in reaching and grasping objects, but are able to visually discriminate different objects.
What is happening in the dorsal visual pathway?
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 are the two visual streams do?
The ventral stream, passing from primary visual cortex (V1) through to inferior parts of the temporal lobe, is considered to
mediate the transformation of the contents of the visual signal into the mental furniture that guides memory, recognition and conscious perception
.
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 happens when ventral pathway 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 does dorsal mean in psychology?
adj.
denoting the hind region or the back surface of the body
. In reference to the latter, this term sometimes is used interchangeably with posterior. Compare ventral.
