Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

1.3K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.3K
Doppler Effect - II01:05

Doppler Effect - II

3.9K
The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
3.9K
Testing a Claim about Mean: Unknown Population SD01:21

Testing a Claim about Mean: Unknown Population SD

4.5K
A complete procedure of testing a hypothesis about a population mean when the population standard deviation is unknown is explained here.
Estimating a population mean requires the samples to be approximately normally distributed. The data should be collected from the randomly selected samples having no sampling bias. There is no specific requirement for sample size. But if the sample size is less than 30, and we don't know the population standard deviation, a different approach is used;...
4.5K
The de Broglie Wavelength02:32

The de Broglie Wavelength

31.2K
In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
31.2K
Doppler Effect - I00:56

Doppler Effect - I

4.1K
The Doppler effect and Doppler shift were named after the Austrian physicist and mathematician Christian Johann Doppler in 1842, who conducted experiments with both moving sources and moving observers. Consider an observer standing on a street corner, observing an ambulance with a siren sound passing by at a constant speed. The observer experiences two characteristic changes in the sound of the siren. Initially, the sound increases in loudness as the ambulance approaches and decreases in...
4.1K
Interference and Diffraction02:18

Interference and Diffraction

49.9K
Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
49.9K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Distant Landmarks Used for Navigation by Homing Pigeons.

Life (Basel, Switzerland)·2026
Same author

Homing pigeon navigation relies on superparamagnetic macrophages under overcast conditions.

Science (New York, N.Y.)·2026
Same author

Resource variability shapes the ecology of social information and collective sensing.

Trends in ecology & evolution·2026
Same author

Genomic comparisons and the adaptive basis of brain size plasticity and chromosomal instability in the Eurasian common shrew.

Molecular biology and evolution·2026
Same author

Gene expression reveals the pancreas of Aselli as a critical organ for plasma cell differentiation in the Eurasian common shrew.

BMC biology·2025
Same author

Programmed seasonal brain shrinkage in the common shrew via water loss without cell death.

Current biology : CB·2025
Same journal

Increased rates of hybridization in swordtails are associated with water pollution.

Current biology : CB·2026
Same journal

Visual uncertainty and task demands shape active sensing strategies in mice.

Current biology : CB·2026
Same journal

An adaptable, self-organizing, single-cell morphology circuit optimizes suctorian predatory trap structure.

Current biology : CB·2026
Same journal

Temporal tuning of switch-like virulence expression resolves environmental uncertainty through phenotypic heterogeneity.

Current biology : CB·2026
Same journal

An abstract relational map emerges in the human medial prefrontal cortex with consolidation.

Current biology : CB·2026
Same journal

Phloem evolved gradually and asynchronously to xylem in early vascular plants.

Current biology : CB·2026
See all related articles

Related Experiment Video

Updated: Nov 4, 2025

Uncovering Hidden Dynamics of Natural Photonic Structures Using Holographic Imaging
05:45

Uncovering Hidden Dynamics of Natural Photonic Structures Using Holographic Imaging

Published on: March 31, 2022

2.8K

Dehnel's phenomenon.

Javier Lázaro1, Dina K N Dechmann1

  • 1Max Planck Institute of Animal Behavior, Radolfzell, Germany; Department of Biology, University of Konstanz, Konstanz, Germany.

Current Biology : CB
|May 25, 2021
PubMed
Summary
This summary is machine-generated.

Some mammals shrink their brains and skulls seasonally to save energy during winter. This adaptation, known as Dehnel's phenomenon, helps them survive food scarcity and high energy needs.

More Related Videos

State-Dependency Effects on TMS: A Look at Motive Phosphene Behavior
12:38

State-Dependency Effects on TMS: A Look at Motive Phosphene Behavior

Published on: December 28, 2010

10.7K
Visualization of Endosome Dynamics in Living Nerve Terminals with Four-dimensional Fluorescence Imaging
10:51

Visualization of Endosome Dynamics in Living Nerve Terminals with Four-dimensional Fluorescence Imaging

Published on: April 16, 2014

9.1K

Related Experiment Videos

Last Updated: Nov 4, 2025

Uncovering Hidden Dynamics of Natural Photonic Structures Using Holographic Imaging
05:45

Uncovering Hidden Dynamics of Natural Photonic Structures Using Holographic Imaging

Published on: March 31, 2022

2.8K
State-Dependency Effects on TMS: A Look at Motive Phosphene Behavior
12:38

State-Dependency Effects on TMS: A Look at Motive Phosphene Behavior

Published on: December 28, 2010

10.7K
Visualization of Endosome Dynamics in Living Nerve Terminals with Four-dimensional Fluorescence Imaging
10:51

Visualization of Endosome Dynamics in Living Nerve Terminals with Four-dimensional Fluorescence Imaging

Published on: April 16, 2014

9.1K

Area of Science:

  • Zoology
  • Comparative Physiology
  • Ecology

Background:

  • Many mammal species face extreme environmental challenges during winter.
  • Seasonal fluctuations in resource availability and temperature necessitate physiological adaptations for survival.

Purpose of the Study:

  • To explain the phenomenon of seasonal brain and skull shrinkage in certain mammals.
  • To elucidate the adaptive significance of Dehnel's phenomenon in energy conservation.

Main Methods:

  • Observational studies on mammal populations.
  • Analysis of physiological and morphological changes.
  • Review of existing literature on winter adaptations.

Main Results:

  • Seasonal brain and skull size reduction observed in specific mammal species.
  • Dehnel's phenomenon is linked to periods of food shortage and increased energy demands.
  • This shrinkage is an energy-saving mechanism.

Conclusions:

  • Dehnel's phenomenon is a crucial adaptation for mammals enduring harsh winter conditions.
  • Seasonal brain size reduction aids survival by minimizing metabolic costs.
  • Understanding this phenomenon provides insights into mammalian resilience.