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

Understanding brain function might help in the development of new treatments for neuropsychiatric illnesses in the future.
Combining different brain research methods enables taking into account individual differences in the brain anatomy. Picture: Juha Gogulski & Mikko Nyrhinen.

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.

By combining different brain research methods in a versatile manner the researchers showed for the first time that transcranial magnetic stimulation of the brain targeting the prefrontal cortex 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 test subjects could help in the development of new treatment methods for neuropsychiatric illnesses in the future,’ says Doctoral Candidate Juha Gogulski.

Safe method

Transcranial magnetic stimulation 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 primary motor cortex 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 brain, making it possible to identify the direction of neural pathways. After the MRI, the neural pathway 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 prefrontal cortex 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.

Further information:

Juha Gogulski
Doctoral candidate
Aalto University and University of Helsinki
[email protected]
Tel. +358 40 570 0451

Synnöve Carlson
Professor
Aalto University and University of Helsinki
[email protected]
Tel. +358 40 760 2286

Article

  • Published:
  • Updated:
Share
URL copied!

Related news

Illustration on beige background: two students painting a big yellow lightbulb.
Press releases, Studies Published:

Apply to Aalto Thesis project: HSL - Software Production 2.0!

Aalto Thesis project's application is open for Master's students. Read more of HSL's project and apply!
Tiina Tuurnala, Alumna of the Year 2019, School of Engineering
Appointments, Press releases Published:

Tiina Tuurnala named as Aalto University School of Engineering Alumna of the Year 2019

'My current position is an excellent vantage point for working toward zero-emission seafaring together with other stakeholders.'
Aiheet, joissa rasismista puhuttiin
Press releases Published:

Discussions about racism strongly differ in the Finnish news media and discussion forums

On the popular Suomi24 discussion forum, users see immigration and minorities as a threat to “the ordinary Finnish people”, while journalists address racism from a historical and international perspective.
DigiEduHack image by DigiEduHack
Campus, Press releases, University Published:

DigiEduHack is reinventing the future of learning and education

DigiEduHack will break continental barriers by connecting around 50 educational institutions worldwide in order to solve the world’s most pressing challenges in digital education