Related Experiment Video
Updated: Feb 15, 2026
10:10
Retroviral Scanning: Mapping MLV Integration Sites to Define Cell-specific Regulatory Regions
Published on: May 28, 2017
8.9K
An Orientation Map for Disparity-Defined Edges in Area V4.
Yang Fang1,2, Ming Chen1,2, Haoran Xu1,2
1Institute of Neuroscience, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, and University of Chinese Academy of Sciences, Shanghai, China.
Cerebral Cortex (New York, N.Y. : 1991)
|January 13, 2018
Summary
Researchers found that area V4 in the brain processes 3D shapes using binocular disparity. This area shows cue-invariant edge representation, crucial for shape-from-disparity perception.
Area of Science:
- Neuroscience
- Computational Vision
- Primate Vision
Background:
- Binocular disparity is key for 3D perception.
- Neurons sensitive to disparity exist in primate visual areas.
- Area V4's role in 3D shape and fine disparity is proposed, but sensitivity to disparity-defined edges remains unclear.
Purpose of the Study:
- Investigate functional organization for disparity-defined edges in visual areas V1, V2, and V4.
- Determine if area V4 neurons are sensitive to disparity-defined edges for shape representation.
- Clarify the hierarchical processing of 3D shape along the ventral pathway.
Main Methods:
- Intrinsic signal optical imaging in nonhuman primates.
- Studied functional organization of disparity edges in V1, V2, and V4.
- Compared responses to disparity-defined edges with luminance-defined edges.
Main Results:
- Area V4 exhibits an orientation map for disparity-defined edges, similar to luminance-defined edges.
- This suggests cue-invariant edge representation in V4.
- Such maps were weaker in V2 and absent in V1, indicating hierarchical processing.
Conclusions:
- Area V4 plays a significant role in shape-from-disparity detection.
- A hierarchical processing of 3D shape exists along the ventral visual pathway.
- V4 demonstrates cue-invariant representation of edges, vital for 3D shape perception.
Related Concept Videos
01:13Location and Orientation of the Heart
11.0K
The human heart, despite its modest size and weight, is an organ of remarkable strength and endurance. Roughly the size of a fist, the heart weighs between 250 and 350 grams and is nestled within the mediastinum, the medial cavity of the thorax. It extends obliquely for about 12 to 14 cm, resting on the superior surface of the diaphragm. The heart is positioned anterior to the vertebral column and posterior to the sternum, with two-thirds of its mass lying to the left of the midsternal line.
11.0K
01:24Defining Psychology
8.0K
Psychology is the scientific discipline dedicated to understanding both observable behavior and the internal mental processes underlying such behavior. It aims to comprehend human nature and apply this understanding to solve practical problems, enhance well-being, and improve societal outcomes. An example of psychology's application is the study of prosocial behavior, such as why and under what conditions individuals might help strangers in need. This process involves describing observed...
8.0K
01:28Piecewise-Defined Functions
330
Piecewise defined functions are mathematical models where different expressions define a function over distinct intervals of the domain. These functions are useful for representing systems with varying behaviors depending on input values.For example, the function: uses a linear rule for inputs less than or equal to –1 and a quadratic rule for values greater than –1. Although it has two formulas, it still defines a single function.Another common type is the absolute value...
330
01:09Defining Social Psychology
509
Social psychology investigates how the presence and actions of others influence individual behavior, cognition, and emotion. Examining the social environment's impact provides a scientific framework for understanding how individuals perceive others and are, in turn, influenced by them. This field seeks to uncover the underlying principles guiding social interactions, exploring phenomena such as conformity, obedience, and prosocial behavior.Core Themes in Social PsychologyOne central focus of...
509
01:29Rules for Defining Functions
385
A relation is a function if each input x is associated with exactly one output y. For example, the equation y = 2x + 5 defines a function because every value of x yields a unique y. However, x = y² + 1 is not a function of x, since a single x-value, such as x = 2, corresponds to two possible y-values: y = 1 and y = -1.The vertical line test helps determine whether a graph represents a function. If a vertical line intersects a curve more than once, the curve fails...
385
01:18Methods of Documentation I: Source-Oriented Records
1.7K
Source-oriented records, or SOR, are medical record-keeping organized by the data source. The SOR system was first developed in the mid-1900s to organize the growing patient data in hospitals and other healthcare facilities.
In an SOR, each discipline involved in patient care maintains a separate medical record section. This record-keeping method enables easy tracking of patient progress and ensures healthcare staff have access to up-to-date information.
Key Attributes include the following:
In an SOR, each discipline involved in patient care maintains a separate medical record section. This record-keeping method enables easy tracking of patient progress and ensures healthcare staff have access to up-to-date information.
Key Attributes include the following:
1.7K