Magnetic stimulation of the brain improved awareness of subject's own cognitive abilities

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Researchers at Aalto University and the University of Helsinki have succeeded for the first time ever in affecting metacognition of a tactile working memory task by combining neural pathway imaging and magnetic stimulation of the brain. Understanding brain function might help in the development of new treatments for neuropsychiatric illnesses in the future.

By combining different brain research methods in a versatile manner the researchers showed for the first time that of the brain targeting the prefrontal can improve a test subject's ability to evaluate his or her performance in a tactile working memory task. The ability of human subjects to monitor and control their own cognitive processes is called metacognition.

Metacognition is important for people and in many neuropsychiatric illnesses, it is possible to recognize that it has weakened.

'The patient's reduced sense of being ill is familiar from conditions such as Alzheimer's disease, schizophrenia, and traumatic brain injury. Understanding the brain function of healthy could help in the development of new treatment methods for neuropsychiatric illnesses in the future,' says Doctoral Candidate Juha Gogulski.

Safe method

Transcranial refers to a method in which the nerve cells of the brain are activated from outside the skull with the help of a magnetic field. When used correctly the method is safe, and it is utilized in procedures such as pinpointing the location of the or the speech area before brain surgery, and in the treatment of depression.

Taking part in the study as test subjects were 14 healthy volunteers. They first underwent structural magnetic resonance imaging (MRI) of the brain as well as a diffusion MRI that is sensitive to the movement of water molecules in the , making it possible to identify the direction of neural pathways. After the MRI, the connections between the primary somatosensory cortex and the prefrontal cortex were determined for each individual.

In the last part of the study the test subjects completed working memory tasks in which they were asked to keep in mind the characteristics of touch sensations from the fingertip and to evaluate whether or not the touch stimulation that was just given was similar to or different from the previous stimulus. During the test they were given magnetic pulses to prefrontal cortex areas that had a neural pathway connection to the part of the somatosensory cortex representing the index finger. The test subjects also evaluated how certain they were about their answers, on which basis calculations were made on how well a person's own evaluation corresponded to the actual performance level.

Magnetic stimulation of the improved the test subjects' evaluation of their performance, as they were able to assess more accurately if their answers had been correct or incorrect.

The study was a collaboration between the Department of Neuroscience and Biomedical Engineering at Aalto University, and Department of Physiology in the Faculty of Medicine, University of Helsinki. The original article was published in the prestigious international science journal Cerebral Cortex.


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More information: Juha Gogulski et al. Neural Substrate for Metacognitive Accuracy of Tactile Working Memory, Cerebral Cortex (2017). DOI: 10.1093/cercor/bhx219
Provided by Aalto University
Citation: Magnetic stimulation of the brain improved awareness of subject's own cognitive abilities (2017, August 29) retrieved 18 February 2019 from https://medicalxpress.com/news/2017-08-magnetic-brain-awareness-subject-cognitive.html
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Aug 29, 2017
And after accounting for placebo, the result is ...

Aug 29, 2017
Long term effects may not indicate this is safe.
Too bad people are being mind raped out of the lab with worse: http://www.bigger...wden.com

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