Photo Credit: Ria Sopala from Pixabay

A first-of-its-kind study scanned the brains of dozens of politically involved participants while they watched campaign ads and speeches by parties from both ends of the political spectrum, just before one of Israel’s recent rounds of elections. The participants, half right-wing and half left-wing, were scanned with magnetic resonance imaging (fMRI), a method that measures brain activation. Surprisingly, it was found that political-dependent differences in the brain response already emerged in early brain regions, such as regions involved in vision and hearing, and the response in these regions was enough to predict an individual’s political views.

The researchers noted that right-wing participants had synchronized brain responses (meaning their brains worked similarly) while they watched the right-wing stimuli, whereas left-wing participants had synchronized brain responses (meaning their brains worked similarly) while they watched the left-wing stimuli. This was true for regions within the sensory, motor, and somatosensory cortices, which are responsible for vision, hearing, and movement.


The study was led by Noa Katabi, a research student in the lab of Dr. Yaara Yeshurun in the School of Psychological Sciences and the Sagol School of Neuroscience. The study was published in the Journal of Neuroscience (Deeper Than You Think: Partisanship-Dependent Brain Responses in Early Sensory and Motor Brain Regions).

During the study, participants watched video clips, including a neutral (in terms of political characteristics) video clip and different political campaign ads and political speeches by politicians from both blocs, Right and Left. The researchers were surprised to discover widespread partisanship-dependent brain activation and synchronization when Right-wing individuals watched the videos of their political bloc, or when Left-wing individuals watched the videos of left-wing politicians.

Interestingly, the researchers found that such partisanship-dependent differences in brain synchronization were not limited to “higher” areas of the brain, associated with interpretation and abstract thinking, as was previously found. Rather, these differences already occurred in regions responsible for sight, hearing, and even touch.

Dr. Yeshurun said: “The research clearly showed that the more the subjects were politically aligned with a certain group, the more their brain response was synchronized, including in motor and somatosensory areas, that is, those areas of the brain that are active when we move or feel things with our senses. Just by the brain’s response in these primary sensory areas, we could tell if a certain individual was left or right-wing. Intriguingly, it was not necessary to examine the activity in “higher” brain areas – areas that are involved in understanding why a certain character did something, or what that character thinks and feels – to predict participants’ political views, it could even be done by examining an area of the brain that is responsible for seeing or hearing.” The researchers think that this surprising finding is because the participants they chose were politically involved, and also due to the timing of the experiment – a few weeks before the elections when the political atmosphere in Israel was very present and emotional.

Dr. Yeshurun adds: “This is the first study to show political-dependent brain activity in early sensory and motor areas, and it can be said that at the most basic brain level, rightists and leftists in Israel literally (and not just metaphorically) don’t see and hear the same things. I think that if we try to understand how people who hold opposite political views to ours experience the world, we might be able to conduct a slightly more effective public discussion that can hopefully attenuate the current political polarization.”

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