Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Emotional control circuit of brain's fear response discovered

25.09.2006
May lead to development of tailored treatments for anxiety
Columbia University Medical Center researchers have identified an emotional control circuit in the human brain which keeps emotionally intense stimuli from interfering with mental functioning. These results significantly enhance our understanding of the neurobiology underlying psychiatric disorders involving emotional control, such as post traumatic stress disorder (PTSD) or depression.

The research employed a novel test in which subjects were forced to detect and resolve attentional conflict created by emotionally powerful stimuli. Brain activity was monitored using functional magnetic resonance imaging (fMRI) that can detect moment-to-moment changes in neural activity. fMRI is a version of the widely-used clinical MRI scanning technique.

The study, which is published in the Sept 21, 2006 issue of Neuron, was led by a Columbia University Medical Center M.D./Ph.D. student, Amit Etkin, who explained that, “Tremendous knowledge exists about how our brains deal with cognitive distractions, but we know very little about how we deal with emotional distractions. This is something we constantly do in our everyday lives, otherwise we would be overwhelmed by every emotional trigger we encounter.”

Dr. Etkin worked in the Columbia University Medical Center labs of Joy Hirsch, Ph.D., professor of neuroradiology and psychology, and director of the fMRI Research Center and Eric Kandel, M.D., Howard Hughes Medical Institute senior investigator, Fred Kavli Professor and Director of the Kavli Institute for Brain Sciences.

The current findings extend on a previous Neuron paper (Dec 16, 2004) in which Drs. Etkin, Kandel and Hirsch found that anxious individuals show more activity in the amygdala, a central brain region involved in the processing of negative emotions, when unconsciously perceiving fearful stimuli (please click here to read the Columbia press release: http://cumc.columbia.edu/news/press_releases/

hirsch_kandel_etkin_anxiety_neuron.html). When these stimuli were perceived consciously, however, the amygdalas of subject with both high and low levels of anxiety responded similarly.

Dr. Hirsch explained that this previous finding suggested that subjects were somehow able to control their conscious emotional responses, but that their unconscious responses may be more automatic. “Following the discovery of the amygdala’s role in fear response, we decided to explore the finer points of the neurocircuitry of fear – how it is regulated and controlled in the brain,” said Dr. Hirsch. facial expressions.

To study emotional regulation, Dr. Etkin collaborated with Tobias Egner, Ph.D., a post-doctoral fellow in Dr. Hirsch’s lab, who has used fMRI to study non-emotional forms of attentional control. In the 2006 Neuron paper, subjects were asked to identify the facial expressions in photos shown to them as either happy or fearful. Across each face were the words FEAR or HAPPY, and were either congruent or conflicting from the facial expressions. When the word and face clashed, subjects experienced an emotional conflict, which slowed their performance and made them less accurate in identifying facial expressions.

Using a clever behavioral trick, however, the researchers were able to discriminate between brain circuitry that detected this emotional conflict from circuitry that resolved this conflict. They found that the amygdala generates the signal telling the brain that an emotional conflict is present; this conflict then interferes with the brains ability to perform the task. The rostral anterior cingulate cortex, a region of the frontal lobe, was activated to resolve the conflict. Critically, the rostral cingulate dampened activity in the amygdala, so that the emotional response did not overwhelm subjects’ performance, thus achieving emotional control. facial expressions.

“This paper adds important regulatory circuit information about the fear response in the amygdala,” said Dr. Hirsch. “For example, if someone is walking on an empty street at night and hears a loud banging sound in the near distance, the amygdala would immediately light up. But instead of always running in the opposite direction from the sound, the rostral cingulate determines if action is needed or not. For example, if it was a car door slamming, the rostral cingulate would shut down the amygdala.”facial expressions.

“Based on these findings, tailored treatments may be developed in the future based on the biology of the person’s disease,” said Dr. Kandel. “For example, we may be able to tailor treatment for an individual depending upon whether anxiety is primarily manifested in the amygdala’s response to unconscious threat, or primarily in the ability of the rostral cingulate to control conscious emotion.”facial expressions.

“Interestingly, several studies have found that rostral cingulate activity predicts whether a depressed patient will respond to medication,” said Dr. Etkin. “The findings from the current study, therefore, may help explain why more rostral cingulate activity may be beneficial.”facial expressions.

The research team that worked on the 2006 Neuron paper also included Columbia University College of Physicians and Surgeons medical student, Daniel Peraza. facial expressions.

Elizabeth Streich | EurekAlert!
Further information:
http://www.cumc.columbia.edu

Further reports about: Amygdala Emotion Etkin Expressions Neuron cingulate fMRI rostral stimuli

More articles from Life Sciences:

nachricht Multi-institutional collaboration uncovers how molecular machines assemble
02.12.2016 | Salk Institute

nachricht Fertilized egg cells trigger and monitor loss of sperm’s epigenetic memory
02.12.2016 | IMBA - Institut für Molekulare Biotechnologie der Österreichischen Akademie der Wissenschaften GmbH

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

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,...

Im Focus: Molecules change shape when wet

Broadband rotational spectroscopy unravels structural reshaping of isolated molecules in the gas phase to accommodate water

In two recent publications in the Journal of Chemical Physics and in the Journal of Physical Chemistry Letters, researchers around Melanie Schnell from the Max...

Im Focus: Fraunhofer ISE Develops Highly Compact, High Frequency DC/DC Converter for Aviation

The efficiency of power electronic systems is not solely dependent on electrical efficiency but also on weight, for example, in mobile systems. When the weight of relevant components and devices in airplanes, for instance, is reduced, fuel savings can be achieved and correspondingly greenhouse gas emissions decreased. New materials and components based on gallium nitride (GaN) can help to reduce weight and increase the efficiency. With these new materials, power electronic switches can be operated at higher switching frequency, resulting in higher power density and lower material costs.

Researchers at the Fraunhofer Institute for Solar Energy Systems ISE together with partners have investigated how these materials can be used to make power...

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

UTSA study describes new minimally invasive device to treat cancer and other illnesses

02.12.2016 | Medical Engineering

Plasma-zapping process could yield trans fat-free soybean oil product

02.12.2016 | Agricultural and Forestry Science

What do Netflix, Google and planetary systems have in common?

02.12.2016 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>