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Related Concept Videos

Blank Solutions00:56

Blank Solutions

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A blank solution is a solution that does not contain the analyte, or the substance of interest being tested or measured. It is typically prepared using the same reagents and procedure as the sample solution but without adding the analyte. The primary purpose of preparing a blank solution is to account for any background interference or contamination that may affect the accuracy and reliability of the analytical method.
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Inertial Frames of Reference01:03

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Newton’s first law is usually considered to be a statement about reference frames. It provides a method for identifying a special type of reference frame: the inertial reference frame. In principle, we can make the net force on a body zero. If its velocity relative to a given frame is constant, then that frame is said to be inertial. So, by definition, an inertial reference frame is a reference frame where Newton's first law holds valid. Newton's first law applies to objects with...
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Non-inertial Frames of Reference01:27

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A reference frame accelerating or decelerating relative to an inertial frame is a non-inertial frame. To help understand this, consider what taking off in an airplane, turning a corner in a car, riding a merry-go-round, and the circular motion of a tropical cyclone all have in common. All these systems are accelerating, decelerating, or rotating relative to the Earth; hence, they all are non-inertial frames. All these systems exhibit inertial forces, which merely seem to arise from motion,...
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Chemical Shift: Internal References and Solvent Effects01:17

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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
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Microtubule Associated Proteins (MAPs)01:42

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Microtubule function and architecture are regulated by an array of specialized proteins called microtubule-associated proteins or MAPs. These proteins are widespread across different organisms and have conserved protein motifs, like the multi-TOG domain for tubulin binding found in the CLASP family of MAPs. Some MAPs are lineage-specific based on their conserved domains. Their functions depend upon the cytoskeletal architecture and cell type they are located within. In-plant cells, a specific...
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Depth Perception and Spatial Vision01:15

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Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
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Related Experiment Video

Updated: Feb 12, 2026

Temporal Ordering of Dynamic Expression Data from Detailed Spatial Expression Maps
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Missing the egocentric spatial reference: a blank on the map.

Maria Concetta Miniaci1, Elvira De Leonibus2,3

  • 1Department of Pharmacy , School of Medicine, University of Naples Federico II, Naples, Italy.

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|March 24, 2018
PubMed
Summary
This summary is machine-generated.

Spatial navigation relies on egocentric and allocentric strategies. Differentiating healthy aging from mild cognitive impairment (MCI) and Alzheimer

Keywords:
Alzheimer’s diseaseagingautism.egocentric navigationposterior parietal cortexstriatum

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Gerontology

Background:

  • Spatial memory deficits are linked to cognitive decline in aging, mild cognitive impairment (MCI), Alzheimer's disease (AD), and autism.
  • Both egocentric (self-centered) and allocentric (viewpoint-independent) spatial representations are crucial for navigation.
  • Altered brain activity in spatial reference systems is observed across these conditions.

Purpose of the Study:

  • To investigate the distinct spatial navigation deficits in healthy aging versus pathological aging (MCI/AD).
  • To highlight the need for specific navigational tests for differential diagnosis.

Main Methods:

  • The study likely involved comparing spatial navigation strategies (egocentric vs. allocentric) in different age groups and cognitive conditions.
  • Specific navigational tests were considered for diagnostic purposes.

Main Results:

  • Healthy older adults show limitations primarily in allocentric navigation but retain egocentric strategies.
  • Patients with MCI and AD exhibit broader spatial navigation impairments, affecting both egocentric and allocentric strategies.
  • Autism spectrum disorder is associated with spatial cognitive deficits, requiring further investigation.

Conclusions:

  • Distinguishing between healthy and pathological aging requires tailored spatial navigation assessments.
  • Understanding spatial cognition in autism warrants additional research.