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Related Concept Videos

Sign Convention01:30

Sign Convention

3.5K
When analyzing a beam subjected to various loads, it is crucial to understand the internal forces and moments generated within the structure. These internal forces can be broadly classified into normal forces, shear forces, and bending moments. To determine these forces and moments, we use the method of sections and apply a specific sign convention based on their direction and the side of the section being analyzed.
The normal force acts perpendicular to the beam's cross-section and can...
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Signs of Puberty01:27

Signs of Puberty

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Puberty is a critical phase, typically beginning between the ages of 8 and 13 in girls and 9 and 14 in boys, though timing can vary based on genetics, environmental factors, and overall health. This period is characterized by the development of secondary sexual characteristics and the attainment of reproductive potential. Endocrine changes underpin puberty, with hormonal surges of Luteinizing Hormone (LH) and Follicle-Stimulating Hormone (FSH) instigated by Gonadotropin-Releasing Hormone (GnRH)...
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Introduction to the Sign Test01:10

Introduction to the Sign Test

1.3K
The sign test is an important tool in nonparametric statistics, offering a straightforward yet effective method for analyzing matched pairs, nominal data, or hypotheses concerning the median of a population. It transforms data points into positive or negative signs, avoiding the need for assumptions about data distribution and instead focusing on the direction of change. It is particularly valuable when data does not conform to the normal distribution requirements of many parametric tests. For...
1.3K
Introduction to Vital Signs01:25

Introduction to Vital Signs

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Vital signs are physiological measurements that help key into the status of the body's essential functions. These include body temperature, pulse rate, respiratory rate, and blood pressure, commonly abbreviated as T, P, R, and BP. Some healthcare settings also consider oxygen saturation (SpO2) and, in specific contexts, pain and level of consciousness as additional vital signs.
Vital signs help healthcare professionals assess an individual's well-being and detect any functional changes...
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Sign Test for Nominal Data01:12

Sign Test for Nominal Data

411
The sign test is a nonparametric method used to evaluate hypotheses about the median of a single sample or to compare the medians of two related samples. The sign test is particularly useful when dealing with nominal data, which includes distinct categories without an inherent order, such as names, labels, and preferences. Nominal data restricts statistical analysis to evaluating population proportions rather than mean or median values that require continuous data.
For example, consider a...
411
Sign Test for Matched Pairs01:17

Sign Test for Matched Pairs

417
The sign test for matched pairs offers a robust method for comparing two paired samples, often for the effects of an intervention in one of them. This method is very useful in situations where the underlying distribution of the data is unknown. The test compares two related samples—often pre- and post-treatment measurements on the same subjects—to determine if there are significant differences in their median values.
To conduct the sign test, we first calculate the differences in...
417

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Related Experiment Video

Updated: Feb 6, 2026

High-throughput Analysis of Locomotor Behavior in the Drosophila Island Assay
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[Cingulate Island Sign].

Etsuko Imabayashi1

  • 1Medical HQs Eisai Co., Ltd.

Brain and Nerve = Shinkei Kenkyu No Shinpo
|August 8, 2018
PubMed
Summary

The Cingulate Island Sign (CIS) using brain perfusion SPECT can help differentiate Dementia with Lewy Bodies (DLB) from Alzheimer's disease (AD). This method shows preserved posterior cingulate metabolism in DLB patients, aiding clinical diagnosis.

Area of Science:

  • Neurology
  • Neuroimaging
  • Dementia Research

Background:

  • The Dementia with Lewy Bodies (DLB) Consortium updated diagnostic criteria for DLB.
  • Single photon emission computed tomography (SPECT)/positron emission tomography (PET) scans showing reduced occipital activity, with or without the Cingulate Island Sign (CIS), are supportive biomarkers for DLB.
  • CIS indicates preserved posterior cingulate metabolism in DLB, unlike in Alzheimer's disease (AD), and correlates negatively with Braak neurofibrillary tangle stages.

Purpose of the Study:

  • To evaluate the clinical utility of optimized Cingulate Island Sign (CIS) analysis using brain perfusion SPECT for differentiating DLB from AD.
  • To describe the feasibility of utilizing brain perfusion SPECT for CIS assessment in DLB diagnosis.

Main Methods:

  • Analysis of brain perfusion SPECT imaging.

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  • Optimization of CIS assessment protocols for SPECT.
  • Comparison of CIS findings between DLB and AD patient cohorts.

    • Main Results:

    • Optimized CIS analysis using brain perfusion SPECT demonstrated clinical utility in distinguishing DLB from AD.
    • The study confirmed the feasibility of applying CIS assessment with brain perfusion SPECT in a clinical diagnostic setting for DLB.

    Conclusions:

    • Brain perfusion SPECT imaging with optimized CIS analysis is a valuable tool for differentiating DLB from AD.
    • This approach supports the integration of neuroimaging biomarkers into the clinical diagnosis of DLB.