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Penn Research Permits First-ever Visualization Of Psychological Stress In The Human Brain

Date:
November 23, 2005
Source:
University of Pennsylvania School of Medicine
Summary:
Using a novel application of an fMRI (functional magnetic resonance imaging) technique, researchers at the University of Pennsylvania School of Medicine have, for the first time, visualized the effects of everyday psychological stress in a healthy human brain. Their work, performed at Penn's Center for Functional Neuroimaging, provides a neuro-imaging marker of psychological stress -- which will pave the way for the development of improved strategies for preventing or correcting the long-term health consequences of chronic stress.

The background of this image shows the mean cerebral blood flow of all the subjects undergoing the stress tasks (here, mental arithmetic) acquired using the continuous arterial spin labeling (CASL) technique. The foreground shows the detected activation in the right prefrontal cortex -- an area long associated with anxiety and depression -- when the subjects are under stress.
Credit: Image Courtesy: Jiongjiong Wang, PhD, and John A. Detre, MD, University of Pennsylvania School of Medicine

Using a novel application of an fMRI (functional magnetic resonance imaging) technique, researchers at the University of Pennsylvania School of Medicine have, for the first time, visualized the effects of everyday psychological stress in a healthy human brain. Their work, performed at Penn's Center for Functional Neuroimaging, provides a neuro-imaging marker of psychological stress -- which will pave the way for the development of improved strategies for preventing or correcting the long-term health consequences of chronic stress. The researchers' study appears in the November 21 online edition of Proceedings of the National Academy of Sciences.

In the Penn study, researchers induced stress on healthy subjects by asking them to quickly tackle challenging mental exercises while being monitored for performance. During the fMRI scans, the researchers also recorded subjects' emotional responses -- such as stress, anxiety, and frustration -- and measured the corresponding changes in stress hormone and heart rate. Many subjects described themselves as being "flustered, distracted, rushed and upset" by the stress task.

The results showed increased cerebral blood-flow during the "stress test" in the right anterior portion of the brain (prefrontal cortex) -- an area long associated with anxiety and depression. More interestingly, the increased cerebral blood-flow persisted even when the testing was complete. These results suggest a strong link between psychological stress and negative emotions. On the other hand, the prefrontal cortex is also associated with the ability to perform executive functions -- such as working memory and goal-oriented behavior -- that permit humans to adapt to environmental challenges and threats. "The message from this study is that while stress may be useful in increasing focus, chronic stress could also be detrimental to mental health," concludes Jiongjiong Wang, PhD, Assistant Professor of Radiology and principal investigator of the study.

"How the brain reacts under psychological stress is an untouched subject for cognitive neuroscientists, but it is certainly a critical piece of the puzzle in understanding the health effects of stress," adds Wang. "Our findings should help significantly advance our understanding of this process."

To date, most fMRI studies have indirectly measured changes in cerebral blood-flow and metabolism induced by neural activation, using a technique that is sensitive to the oxygenation levels in blood. "The fMRI technique employed in our study -- arterial spin labeling -- can measure cerebral flood-flow directly," states John A. Detre, MD, Associate Professor of Neurology and Radiology, and senior author of the study. "This technique is very similar to PET (positron emission tomography) scanning, except that it's entirely non-invasive -- without the need for injections or radioactivity. In this elegant technique, water molecules in subjects' own blood are 'tagged' by the magnet and used as the natural contrast agent to measure cerebral blood-flow." Researchers at Penn's Center for Functional Neuroimaging have been at the forefront of the development of this technique, and its applications to imaging brain-function during cognitive and emotional processes.

###

The study was sponsored by grants from the National Science Foundation, the National Institutes of Health, and the U.S. Air Force. In addition to Drs. Wang and Detre, the team of investigators included Penn researchers Hengyi Rao, Gabriel S. Wetmore, Patricia M. Furlan, Marc Korczykowski, and David F. Dinges.

Editors' Notes: For more information about the Center for Functional Neuroimaging (CFN) at Penn, go to www.cfn.upenn.edu.


Story Source:

The above story is based on materials provided by University of Pennsylvania School of Medicine. Note: Materials may be edited for content and length.


Cite This Page:

University of Pennsylvania School of Medicine. "Penn Research Permits First-ever Visualization Of Psychological Stress In The Human Brain." ScienceDaily. ScienceDaily, 23 November 2005. <www.sciencedaily.com/releases/2005/11/051122210156.htm>.
University of Pennsylvania School of Medicine. (2005, November 23). Penn Research Permits First-ever Visualization Of Psychological Stress In The Human Brain. ScienceDaily. Retrieved July 23, 2014 from www.sciencedaily.com/releases/2005/11/051122210156.htm
University of Pennsylvania School of Medicine. "Penn Research Permits First-ever Visualization Of Psychological Stress In The Human Brain." ScienceDaily. www.sciencedaily.com/releases/2005/11/051122210156.htm (accessed July 23, 2014).

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