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Related Concept Videos

Units and Standards of Measurement01:10

Units and Standards of Measurement

A physical quantity is defined either by specifying its measurement method or by stating how it is calculated from other measurements. For example, consider a metallic cube. We might define its mass and dimensions by specifying methods for measuring them, such as using a weighing machine and a meter scale. Then, we could define the volume by stating that it is the cube of its side, and we could calculate the density as the mass divided by the volume.
Measurements of physical quantities are...
Units and Standards of Measurement01:10

Units and Standards of Measurement

A physical quantity is defined either by specifying its measurement method or by stating how it is calculated from other measurements. For example, consider a metallic cube. We might define its mass and dimensions by specifying methods for measuring them, such as using a weighing machine and a meter scale. Then, we could define the volume by stating that it is the cube of its side, and we could calculate the density as the mass divided by the volume.
Measurements of physical quantities are...
SI Units: 2019 Redefinition01:13

SI Units: 2019 Redefinition

Measurement is an indispensable part of analytical chemistry. The result of measurement helps quantify a substance's physical property and compare it with the physical property of another substance. Each measurement comprises two components - a number indicating the magnitude and a unit of measurement as a standard for comparison. Further, the same quantity can be measured using different units of measurement, which leads to differences in magnitude.
A standard set of units has been defined to...
Measurement: Standard Units03:38

Measurement: Standard Units

Every measurement provides three kinds of information: the size or magnitude of the measurement (a number), a standard of comparison for the measurement (a unit), and an indication of the uncertainty of the measurement. While the number and unit are explicitly represented when a quantity is written, the uncertainty is an aspect of the errors in the measurement results.
Dimensional Analysis03:40

Dimensional Analysis

Dimensional analysis, also known as the factor label method, is a versatile approach for mathematical operations. The main principle behind this approach is: the units of quantities must be subjected to the same mathematical operations as their associated numbers. This method can be applied to computations ranging from simple unit conversions to more complex and multi-step calculations involving several different quantities and their units.
Conversion Factors and Dimensional Analysis
The unit...
Dimensional Analysis02:19

Dimensional Analysis

The concept of dimension is important because every mathematical equation linking physical quantities must be dimensionally consistent, implying that mathematical equations must meet the following two rules. The first rule is that, in an equation, the expressions on each side of the equal sign must have the same dimensions. This is fairly intuitive since we can only add or subtract quantities of the same type (dimension). The second rule states that, in an equation, the arguments of any of the...

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A Metric Test for Assessing Spatial Working Memory in Adult Rats Following Traumatic Brain Injury
05:53

A Metric Test for Assessing Spatial Working Memory in Adult Rats Following Traumatic Brain Injury

Published on: May 7, 2021

A metric for space.

Edvard I Moser1, May-Britt Moser

  • 1Kavli Institute for Systems Neuroscience, Norwegian University of Science and Technology, 7489 Trondheim, Norway. edvard.moser@cbm.ntnu.no

Hippocampus
|November 21, 2008
PubMed
Summary
This summary is machine-generated.

Grid cells, a type of neuron, create a spatial map in the brain. Their discovery offers insights into how the brain encodes information in higher-order cortical areas.

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Area of Science:

  • Neuroscience
  • Cognitive Science

Background:

  • Understanding cortical microcircuit computation remains challenging, especially in higher-order, nonsensory brain regions.
  • Research has elucidated sensory processing but understanding internally generated codes is limited.

Purpose of the Study:

  • To explore the mysterious mechanisms of information coding in higher-order cortical areas.
  • To investigate the role of newly discovered grid cells in spatial representation.

Main Methods:

  • The study focuses on the discovery and properties of grid cells.
  • Analysis of neuronal firing patterns in relation to an animal's environment.

Main Results:

  • Grid cells, found in the entorhinal cortex, exhibit periodic firing fields forming hexagonal or triangular arrays.
  • These firing patterns remain stable regardless of changes in animal speed or direction.
  • Grid cells are proposed to be part of the brain's spatial metric system.

Conclusions:

  • Grid cells provide a unique window into the brain's internal coding principles.
  • Their self-generated, structured firing fields offer insights into basic cortical circuit operations.
  • This discovery advances our understanding of neural computation beyond sensory pathways.