What are the dorsal and ventral 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 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 are the two visual pathways?
This provides information about the depth of objects. In addition to the primary visual pathways, two other major visual pathways can be distinguished: the tectal, or collicular, pathway and the pretectal nuclei pathway. Thus fibers from the optic tracts do not all go to the lateral geniculate body.
What is the What pathway responsible for?
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 is the ventral stream?
a series of cortical maps of the visual field that flow from the occipital cortex to the temporal lobe. These maps represent nameable visual features of objects, such as color, size, texture, object identity, and the like. The ventral stream is known informally as the “what” pathway of perception.
What is the function of dorsal 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 is the ventral visual stream?
The anatomical substrates to the ventral visual pathway were initially identified in macaque monkeys by Mishkin and Ungerleider (1982). This pathway consists of visual input from primary visual cortex V1 relayed through areas V2 and V4, and ultimately projected into the inferior temporal cortex.
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 visual pathway?
The visual pathway refers to the anatomical structures responsible for the conversion of light energy into electrical action potentials that can be interpreted by the brain. It begins at the retina and terminates at the primary visual cortex (with several intercortical tracts).
What is a visual pathway in psychology?
The primary visual pathway consists of the retina, optic nerve, lateral geniculate nucleus (LGN) of the thalamus, and the visual cortex of occipital lobe. Each of these structures function in sequence to transform the visual signal, leading to our visual perception of the external world.
What is the visual pathway from the eye to the brain?
The optic nerve is the pathway that carries the nerve impulses from each eye to the various structures in the brain that analyze these visual signals. The optic nerves of the two eyes emerge from their optics discs and intersect at the optic chiasm just in front of the pituitary gland.
Cosa è la corteccia visiva?
Da Wikipedia, l’enciclopedia libera. Il termine corteccia visiva si riferisce principalmente alla corteccia visiva primaria (nota anche come corteccia striata o V1 ), ma include anche le aree visive corticali extra-striate come la V2, V3, V4, e V5.
Cosa sono la corteccia visiva primaria e secondaria?
La corteccia visiva primaria (o corteccia calcarina) e la corteccia visiva secondaria. Situate sul lobo occipitale, sono deputate al controllo della vista, al riconoscimento dei colori e alla percezione della profondità; La corteccia uditiva primaria e secondaria.
Cosa comprende la corteccia sensitiva?
La corteccia sensitiva comprende tutte quelle aree di corteccia cerebrale implicate nelle funzioni sensoriali (udito, olfatto, vista, tatto e gusto). Alla corteccia sensitiva appartengono: L’ area somatosensoriale primaria e secondaria, e la corteccia parietale posteriore.