That those who lean to opposite ends of the political spectrum think differently from each other is obvious. That such differences show up in brain scans is intriguing
Save time by listening to our audio articles as you multitaskDaantje de Bruin and Oriel FeldmanHall, of Brown University, in Rhode Island, published their study inJournal of Neuroscience
. Both used functional magnetic-resonance imaging, which measures changes in blood flow as a proxy for neural activity, to look at groups of 44 and 34 volunteers respectively, from across the political spectrum. Ms de Bruin and Dr FeldmanHall first asked their volunteers to read a list of words—some politically charged, some not—while lying in the scanner. For each word, they recorded activity patterns in the amygdala and the striatum . Neutral words showed no difference. But for words related to “immigration” and “American” the activity patterns in the striatum clustered according to participants’ politics.
Next, they asked people to watch a neutrally worded news clip on abortion and also heated debates on policing and immigration. Patterns of activity stimulated by the news clip were indistinguishable between left- and right-wingers, but those generated by the immigration debate clearly divided them. Ms Katabi and Dr Yeshurun, by contrast, went straight for videos. They asked participants to watch campaign ads and speeches, and a neutral clip. They found differences in the responses to politically charged material of parts of the cortex that deal with vision, hearing and movement. Moreover, unlike Ms de Bruin and Dr FeldmanHall, who merely noted correlations, they said they could predict an individual’s political views from the scan. Not quite Big Brother in 1984, yet.
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