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Related Concept Videos

Aging01:26

Aging

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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
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The Effect of Aging on Tissues01:19

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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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Proton (¹H) NMR: Chemical Shift01:07

Proton (¹H) NMR: Chemical Shift

3.5K
Organic molecules primarily contain carbon and hydrogen atoms. While all the hydrogen isotopes are NMR-active, protium or hydrogen-1 is the most abundant. It has a significant energy separation between its nuclear spin states due to its large gyromagnetic ratio. As per Boltzmann's distribution, an increase in the energy separation implies a greater excess population of nuclei available for excitation, resulting in a strong NMR absorption signal.
Absorption signals of all the protium nuclei...
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Changes in the Appendicular Skeleton with Age01:09

Changes in the Appendicular Skeleton with Age

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The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
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NMR Spectroscopy: Chemical Shift Overview01:15

NMR Spectroscopy: Chemical Shift Overview

3.3K
The position of the absorption signal of a sample is reported relative to the position of the signal of tetramethylsilane (TMS), which is added as an internal reference while recording spectra. The difference between the absorption frequencies of the sample and TMS (in Hz) is divided by the spectrometer operating frequency (in MHz) to obtain a dimensionless quantity called the chemical shift. It is reported on the δ (delta) scale and expressed in parts per million.
For instance, the proton...
3.3K
Inductive Effects on Chemical Shift: Overview01:27

Inductive Effects on Chemical Shift: Overview

2.2K
The protons in unsubstituted alkanes are strongly shielded with chemical shifts below 1.8 ppm. Methine, methylene, and methyl protons appear at approximately 1.7, 1.2 and 0.7 ppm, while the proton signal from methane appears at 0.23 ppm. An electronegative substituent, such as chlorine, withdraws the electron density from the protons, increasing their chemical shift. Progressive substitution of the hydrogens in methane by chlorine shifts the proton signals increasingly downfield, to 3.05 ppm in...
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High-Accuracy Correction of 3D Chromatic Shifts in the Age of Super-Resolution Biological Imaging Using Chromagnon
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The shifting self in aging.

Emin Altintas1,2, Karim Gallouj1, Mohamad El Haj3,4,5

  • 1Unité de Gériatrie, Centre Hospitalier de Tourcoing, Tourcoing, France.

Aging Clinical and Experimental Research
|November 9, 2018
PubMed
Summary
This summary is machine-generated.

Older adults are slower at shifting self-images, possibly due to a greater preference for self-concept stability. This suggests a link between cognitive flexibility and stable self-perceptions in aging.

Keywords:
AgingSelfSelf-imagesShifting

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Area of Science:

  • Cognitive psychology
  • Developmental psychology
  • Social psychology

Background:

  • Investigating the cognitive mechanisms underlying self-perception in aging.
  • Understanding how older adults manage shifts in self-representation.

Purpose of the Study:

  • To examine the ability of older adults to shift between different aspects of their self-image.
  • To compare the self-shifting capabilities of older and younger adults.

Main Methods:

  • A novel shifting-self task was developed, requiring participants to alternate between describing physical and psychological self-attributes.
  • Control tasks included producing self-statements within a single domain and a standard cognitive shifting task (plus-minus task).
  • Performance was measured by completion time and accuracy.

Main Results:

  • Older adults exhibited significantly slower completion times on the shifting-self task compared to younger adults.
  • Both age groups took longer to complete the shifting-self task than the control task.
  • Performance on the shifting-self task correlated with performance on the plus-minus task, indicating a general shifting ability.

Conclusions:

  • The findings suggest that older adults may be less cognitively flexible when shifting self-images.
  • This slower shifting ability could be attributed to a greater tendency towards self-concept stability in older age.
  • A stable self-concept may lead older adults to be more resistant to changing their self-perceptions.