What does visual area V4 do?
V4 comprises cells that exhibit diverse receptive field preferences related to surface properties (color, brightness, texture), shape (orientation, curvature), motion and motion contrast, and depth. V4 has also been a focus of studies on visual attention.
What visual information is represented in area V4?
Like V2, V4 is tuned for orientation, spatial frequency, and color. Unlike V2, V4 is tuned for object features of intermediate complexity, like simple geometric shapes, although no one has developed a full parametric description of the tuning space for V4.
What do neurons in V4 do?
Neurons in area V4 are known to respond selectively to shape-related features, such as curvature and convexity (38), and this alone could account for differences in firing between the illusion-promoting and control stimuli.
Is V4 in the primary visual cortex?
The visual cortex is divided into six critical areas depending on the structure and function of the area. These are often referred to as V1, V2, V3, V4, V5, and the inferotemporal cortex. The primary visual cortex (V1) is the first stop for visual information in the occipital lobe.
What does area V5 do?
Area V5 of the visual brain, first identified anatomically in 1969 as a separate visual area, is critical for the perception of visual motion. As one of the most intensively studied parts of the visual brain, it has yielded many insights into how the visual brain operates.
What happens if the visual cortex is damaged?
Destruction of the primary visual cortex leads to blindness in the part of the visual field that corresponds to the damaged cortical representation. The area of blindness – known as a scotoma – is in the visual field opposite the damaged hemisphere and can vary from a small area up to the entire hemifield.
What is the secondary visual area?
the area immediately surrounding the primary visual cortex (see striate cortex) in the occipital lobes, receiving signals from it secondarily for analysis and further discrimination of visual input in terms of motion, shape (particularly complex shapes), and position.
What is a visual area?
: a sensory area of the occipital lobe of the cerebral cortex receiving afferent nerve fibers concerned with vision. — called also visual area.
Where is the V4 in the brain?
Using fMRI brain imaging, scientists found three main areas stimulated by colour: V1, an area in the ventral occipital lobe, specifically the lingual gyrus, which was designated as human V4, or hV4, and another area located anteriorly in the fusiform gyrus, designated as V4α.
Where is area MT located?
The middle temporal area (MT) in the posterior bank of the superior temporal sulcus (STS) was first described more than 30 years ago (Allman and Kaas, 1971, Dubner and Zeki, 1971). MT can be characterized by two key features: first, this area is anatomically defined by the intensive staining of myelin.
What does MT stand for brain?
The medial superior temporal (MST) area is a part of the cerebral cortex, which lies in the dorsal stream of the visual area of the primate brain. The MST receives most of its inputs from the middle temporal (MT) area, which is involved primarily in the detection of motion.
What is visual cortex disorder?
What is CVI? Cerebral visual impairment (sometimes called cortical visual impairment or CVI) is a disorder caused by damage to the parts of the brain that process vision. It’s most common in babies and young children, but can continue into adulthood.
Is the V3 part of the visual cortex?
V3 as a whole is less well-defined compared to other areas of the visual cortex. V4 receives information from V2 and is part of the ventral processing stream. Cells in V4 are very responsive to color. V5 is part of the dorsal processing pathway and contains cells highly sensitive to motion.
What is the purpose of the visual area V4?
The firing properties of V4 were first described by Semir Zeki in the late 1970s, who also named the area. Before that, V4 was known by its anatomical description, the prelunate gyrus. Originally, Zeki argued that the purpose of V4 was to process color information.
Where is the visual area located in the brain?
It is located anterior to V2 and posterior to visual area PIT. It comprises at least four regions (left and right V4d, left and right V4v), and some groups report that it contains rostral and caudal subdivisions as well.
Where is the visual cortex of a macaque monkey?
Visual area V4. V4. Visual area V4 is one of the visual areas in the extrastriate visual cortex of the macaque monkey. It is located anterior to V2 and posterior to visual area PIT. It comprises at least four regions (left and right V4d, left and right V4v), and some groups report that it contains rostral and caudal subdivisions as well.