Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Penn study may explain cliche of ’hot-headed’ men

18.09.2002


There is a sound neurological basis for the cliché that men are more aggressive than women, according to new findings by scientists at the University of Pennsylvania School of Medicine.



Using magnetic resonance imaging (MRI) scans, the Penn scientists illustrated for the first time that the relative size of the sections of the brain known to constrain aggression and monitor behavior is larger in women than in men.

The research, by Ruben C. Gur, PhD, and Raquel E. Gur, MD, PhD, and their colleagues in Penn’s Department of Psychiatry and the Department of Epidemiology, is published in the recent issue of the Journal of the Cerebral Cortex.


The findings provide a new research path for therapies that may eventually help psychiatric patients control inappropriate aggression and dangerous patterns of impulsive behavior. They also bolster previous work by the Gurs demonstrating that although some gender differences develop as result of adaptive patterns of socialization, other distinctions are biologically based and probably innate.

"As scientists become more capable of mapping the functions of activity in various parts of the brain, we are discovering a variety of differences in the way men and women’s brains are structured and how they operate," said Ruben Gur, first author of the study.

"Perhaps the most salient emotional difference between men and women, dwarfing all other differences, is aggression," he said. "This study affords us neurobiological evidence that women may have a better brain capacity than men for actually ’censoring’ their aggressive and anger responses."

In the Gurs’ work, they relied on established scientific findings that human emotions are stimulated and regulated through a network that extends through much of the limbic system at the base of the brain (the region encompassing the amygdala, hypothalamus and mesocorticolimbic dopamine systems), and then upward and forward into the region around the eyes and forehead (the orbital and dorsolateral frontal area), and under the temples (the parietal and temporal cortex).

The amygdala is involved in emotional behavior related to arousal and excitement, while the orbital frontal region is involved in the modulation of aggression.

The Gurs’ study measured the ratio of orbital to amygdala volume in a sample of 116 right-handed, healthy adults younger than 50 years of age; 57 subjects were male and 59 were female. Once the scientists adjusted their measurements to allow for the difference between men and women in physical size, they found that the women’s brains had a significantly higher volume of orbital frontal cortex in proportion to amygdala volume than did the brains of the men.

"Because men and women differ in the way they process the emotions associated with perception, experience, expression, and most particularly in aggression, our belief is that the proportional difference in size in the region of the brain that governs behavior, compared to the region related to impulsiveness, may be a major factor in determining what is often considered ’gendered-related’ behavior," Raquel Gur said.


Others Penn investigators participating in the study were Faith Gunning-Dixon, PhD, and Warren B. Bilker, PhD, of the Department of Epidemiology.

The study was funded by a grant from the National Institutes of Health

Ellen O’Brien | EurekAlert1
Further information:
http://www.med.upenn.edu/

More articles from Health and Medicine:

nachricht Speed data for the brain’s navigation system
06.12.2016 | Deutsches Zentrum für Neurodegenerative Erkrankungen e.V. (DZNE)

nachricht Study suggests possible new target for treating and preventing Alzheimer's
02.12.2016 | Oregon Health & Science University

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Significantly more productivity in USP lasers

In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.

Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...

Im Focus: Shape matters when light meets atom

Mapping the interaction of a single atom with a single photon may inform design of quantum devices

Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...

Im Focus: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

Im Focus: MADMAX: Max Planck Institute for Physics takes up axion research

The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.

The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

Porous crystalline materials: TU Graz researcher shows method for controlled growth

07.12.2016 | Materials Sciences

Simple processing technique could cut cost of organic PV and wearable electronics

06.12.2016 | Materials Sciences

3-D printed kidney phantoms aid nuclear medicine dosing calibration

06.12.2016 | Medical Engineering

VideoLinks
B2B-VideoLinks
More VideoLinks >>>