Long-range Projections
Long-range Projections - Related Videos
00:59
Range
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2023
The range is one of the measures of variation. It can be defined as the difference between a dataset's highest and lowest values. For example, in the study of seven 16-ounce soda cans, the filled volume of soda was measured, thus producing the following amount (in ounces) of soda: 15.9; 16.1; 15.2; 14.8; 15.8; 15.9; 16.0; 15.5 Measurements of the amount of soda in a 16-ounce can vary since different subjects record these measurements or since the exact amount - 16 ounces of liquid, was not...
02:18
Fischer Projections
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2023
Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines. While...
02:32
Variation: Normal Distribution, Range, and Standard Deviation
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2020
In the field of psychology, there are several ways to organize measurements of a trait, feature, or characteristic (i.e., variables). Qualitative data, such as ethnicity, can be tabulated into a frequency count to provide information about the proportion, as well as the variety of groups in a sample or population. On the other hand, researchers can perform a wider set of calculations on quantitative data. The mean, mode, and median, for instance, are central tendency measures to identify a...
02:06
Newman Projections
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2023
Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively. The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as conformers.
01:27
¹H NMR: Long-Range Coupling
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2024
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling. In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene π orbitals.
FAQs
The outcome depends on how action potentials reach axon terminals and how those terminals release neurotransmitters onto target cells. This signaling can alter target-cell activity, influence connectivity, or help coordinate responses across regions. Examining these effects helps researchers move beyond identifying an anatomical pathway to understanding how its communication contributes to circuit function.
Connections between distant regions allow distributed neural circuits to operate as coordinated systems rather than isolated areas. Their activity can contribute to perception, movement, learning, and behavior by linking processing across regions. Studying these pathways therefore helps explain how circuit-level communication supports complex functions that depend on interactions among multiple parts of the nervous system.
Disrupted communication along these pathways can indicate that distant regions are no longer coordinating normally. Researchers examine such abnormalities to clarify how altered circuit organization may contribute to neurological and psychiatric disorders. This perspective also supports circuit-based interventions designed to influence specific connections rather than treating the nervous system as a uniform, undifferentiated network.
A typical investigation combines complementary approaches rather than relying on one measurement. Anatomical tracing maps where pathways travel and which regions they connect, while electrophysiology examines neural electrical activity. Imaging provides additional views of circuit organization, and targeted manipulation tests whether a connection contributes to a particular response, behavior, or neural function.
These methods answer different questions about the same circuit. Anatomical tracing emphasizes pathway organization, imaging helps visualize circuit structure or activity, and electrophysiology measures electrical signaling. Targeted manipulation changes selected circuit elements to test their functional contribution. Using the methods together can connect the presence of a pathway with its activity and behavioral relevance.
They are especially useful when a research question concerns communication between distant neural regions and its relationship to perception, movement, learning, or behavior. Mapping and testing these connections can reveal how distributed circuits are organized, identify communication failures associated with disease, and guide the development of more precise interventions aimed at defined circuit relationships.