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The Part of the Brain that Suppresses Instinct


  • Published: 2010-12-22 : Author: York University
  • Synopsis: Revealing which regions in the brain fire up when we suppress an automatic behavior.

Research from York University is revealing which regions in the brain "fire up" when we suppress an automatic behavior such as the urge to look at other people as we enter an elevator.

A York study, published recently in the journal Frontiers in Human Neuroscience, used fMRI (functional Magnetic Resonance Imaging) to track brain activity when study participants looked at an image of a facial expression with a word superimposed on it. Study participants processed the words faster than the facial expressions. However, when the word did not match the image - for example, when the word "sad" was superimposed on an image of someone smiling - participants reacted less quickly to a request to read the word.

"The emotion in the word doesn't match the emotion in the facial expression, which creates a conflict," said Joseph DeSouza, assistant professor of psychology in York's Faculty of Health. "Our study showed - for the first time - an increase in signal from the left inferior frontal cortex when the study participant was confronted by this conflict between the word and the image and asked to respond to directions that went against their automatic instincts."

Previous research on the prefrontal cortex has found this region to be implicated in higher order cognitive functions including longterm planning, response suppression and response selection. This experiment, conducted by graduate student Shima Ovaysikia under DeSouza's supervision, allowed researchers to study inhibitory mechanisms for much more complex stimuli than have been studied in the past.

The inferior frontal cortex is located near the front left temple. People who have problems with inhibition, including stroke or schizophrenia patients, may have damage to this inferior frontal cortex zone, says DeSouza. As a result, when they see something that is inconsistent - such as the image of a smiling face with the word "sad" across it - they would be expected to take more time to react, because the part of their brains needed to process it has been damaged or destroyed.

The research, conducted by York's Center for Vision Research with the use of fMRI technology at Queen's University, was partially funded by the Faculty of Health at York University, the Natural Sciences and Engineering Research Council (NSERC), and Research at York (RAY) program. Future fMRI research at York will be conducted in a state-of-the-art neuroimaging laboratory at York's new Sherman Health Science Research Center, which opened in September.

York University is the leading interdisciplinary research and teaching university in Canada. York offers a modern, academic experience at the undergraduate and graduate level in Toronto, Canada's most international city. The third largest university in the country, York is host to a dynamic academic community of 50,000 students and 7,000 faculty and staff, as well as 200,000 alumni worldwide. York's 10 Faculties and 28 research centers conduct ambitious, groundbreaking research that is interdisciplinary, cutting across traditional academic boundaries. This distinctive and collaborative approach is preparing students for the future and bringing fresh insights and solutions to real-world challenges. York University is an autonomous, not-for-profit corporation.

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