How could any one see a video with a title like “How We Read Each Other’s Minds” and not be instantly pulled into watching it? While scrolling through my options of TED talks I saw this one and immediately had questions forming in my mind. Questions like “I can read minds?” and “can other people read mine?” Seeing a title like that made me think that there’s was clearly something going on in the brain that I had no clue about, and that’s why I picked this talk. This “mind reading” talk comes from Rebecca Saxe, cognitive neuroscientist from MIT. Rebecca tells us about her study which focuses on how we think about other people’s thoughts. Her TED talk used information she gathered in the Saxe lab at MIT including a couple different experiments with children and adults. Rebecca Saxe’s whole “mind reading” topic refers to how we able to judge and interpret what another human mind is thinking. Rebecca leads this talk with one main question for the audience to think about: Why is it so easy for humans to interpret what other brains are thinking? She starts about with the physical location responsible for this specific brain function, the rTPJ. The right temporo-parietal junction is a very tiny small on our brain that has all the responsibility for judging what others are thinking.
The next thing Rebecca showed us was the development of the human brain being able to “mind read” along with the development of this particular region of the brain with age. In order to show us this, she used three little boys of different ages: 3, 5, and 7. In the experiment, they put each of the kids in the same situation where a pirate had a sandwich and sat it down on a treasure chest then left, then the wind knocked that sandwich on the ground and a second pirate came and replaced it with his sandwich then left. When the first pirate returned, he took the sandwich sitting on the chest, not realizing that his sandwich was on the ground. They asked each kid to predict which sandwich the pirate would take and then after seeing the results they asked them to say why they took the sandwich they took. The 3 year old predicted the pirate to take his original sandwich laying on the ground, and when he didn’t, his explanation was that he had to take the other sandwich because his was on the ground and it was dirty. The 3 year old was not yet able to understand how the boy didn’t know about what had occurred. The 5 and 7 year old boys both predicted the correct sandwich would be taken then we’re able to explain that the pirate didn’t know that his sandwich was on the ground. When they asked the two younger kids if it was the first pirate who should be punished for eating the wrong sandwich, they answered yes, unable to see how the boy had no consciousness intentional of wrongdoing. Only the 7 year old boy was able to understand and explain that this situation was caused by the wind, therefore the wind is to blame. This experiment showed what she called the standard disbelief task. Brain scans used to monitor kids brains during this time showed that the amount of activity in the corresponding brain region was much less in kids ages three to eight compared to adults. Rebecca used this to show us how over the course of child development, cognitive system and mind reading slowly forms and develop.
Another question Rebecca had was could differences among adults in how they think about other people’s thoughts and can they be explained in terms of this brain region. So they gave the adult a test similar to the test given to the kids while monitoring their brain patterns for data comparison. The test group was given three scenarios. In one scenario, a girl named Grace poured what she thought was poison, but turned out to be sugar, into her friends coffee and gave it to her to drink, attempting to poison her friend. In the second case, Grace pored what she believed was sugar but turned out to be poison, accidentally poisoning her friend. Then the third case was just Grace pouring in actual sugar that she though was sugar. Then they asked “How much should Grace be blamed?” In the “attempted column, numbers were doubled compared to how much blame Grace should get for the “accidental” scenario. Then the third column labeled “fine” remained very low. When they looked in the brains, it showed that the more activity in the region, the more people paid attention to her innocent belief and thought she should receive little blame. This showed how more activity meant more ability to feel and think inside other people’s brains and use feelings and judgement to make decisions. The last thing Rebecca did was use a specific machine to turn off the rTPJ in the brain to see if they could change people’s moral judgements. Transcranial magnetic stimulation machines are used to disorganize small regions of the brain and was able to temporarily “turn off” this part of each individual in the group’s brain. Results showed that without a functioning rTPJ, the severity of blame people thought they should put on the “attempted” situation lowered significantly while the blame on the “accidental” test raised up, narrowing the gap between the two. The test showed how this region of the brain, in fully developed adults, is very important in how we perceive other people thoughts and feelings.
She showed us how her research was conducted and different steps she used, but didn’t give us a lot of important background information that would have helped establish more credibility in her research. We were only told about 3 young boys specifically that she did the experiment on for the child portion of her research. We don’t know how these boys were selected or what results and answers we could have gotten from female children. In the adult portion, she tells us that there was a group of adults tested, but nothing else. For all we know, this could be a group of 20 elderly women in a retirement home in Arkansas. She gave us no secure verification that this experiment was done through random selection, therefore hurting the credibility of this video’s research and results.
It’s a subject that I did find very interesting because we talk about a lot to the things that go on in the brain in class, but never really get in depth on this particular subject. Through my high school anatomy class and with the neuroscience section of college psychology, I thought I had the parts of the temporal and parietal regions on the brain figured out for the most part. But I had never heard of this part or its function. I think it’s very rare that humans realize that we can actually use our senses, knowledge of the world, and different brain functions to predict and determine someone else’s thoughts and actions. It may be a different version that we had in mind, but it is still mind reading none the less.
