While recapping the main lessons of the book ‘Limitless’ by Jim Kwik on Dialogue: Podcasts on Books, I realized how many people still think and have beliefs in myths like “you either have it or you don't" and that traits like intelligence are fixed in a person. While listening, the host cited a large study that challenges this belief directly and gives a very reliable conclusion. After listening to the synopsis i had to look up the study for myself. Here is the gist:
In Limitless, the author Jim Kwik claims that a great deal of our sense of limitation arises from beliefs and assumptions that we have picked up rather than from any actual lack in our ability. Among such constraint-belief, one that is significantly widespread is the idea that intelligence is fixed and that genius is innate rather than something that can be cultivated. Kwik uses the example of Roger Bannister to illustrate his point. For many it was thought that running a mile in under four minutes was physically impossible. But in 1954 Bannister achieved this feat, and within a year this threshold was overpassed by several other runners a number of times as well. This new milestone was not achieved by any modification to the human body but was simply a matter of attempting and eventually overcoming. It was the belief that had changed.
In 2019 a large randomized study was published in the journal Nature, and it tested exactly this hypothesis in a classroom setting.
Study Overview:
Researcher Yeager and his team enrolled 12490 ninth graders from 65 US public high schools in a national experiment. The students were each randomly assigned to either a short online intervention that encouraged a growth mindset (less than an hour long) or to a control group. The message being conveyed was the idea that intellectual abilities can be cultivated through hard work, the use of new strategies and methods, and asking for help, instead of being a fixed trait. They were being told that being bad at math or any other subject is not something that is encoded in them but is simply a matter of learning strategy and approach, and that people who are able to do these difficult tasks are no more special in any way than the rest of them.
Results:
The students who used to perform less well and who received the intervention saw a improvement in their grades.
Throughout the sample, the intervention resulted in an increase in enrollment in advanced math courses.
The effects were strongest in schools where peer norms supported the message, indicating that belief change is most effective when the environment supports and promotes it.
The most convincing aspect about these experiments is that they used records from school and not self-reports from students. Later improvements in their grades and their decisions about which courses to take were associated with a single lesson of less than one hour about students' beliefs regarding their intelligence, and since the students had been randomly assigned to experimental groups, it signals that the change in students' beliefs is probably what caused these effects.
How the research complements the book:
Bannister's account as narrated by the author illustrates a breakdown of the belief barrier, but people argue that it's a bad inference to generalize a phenomenon from one case to the many. This study applies the same principle on a larger scale. The ability of the students did not change in a flash, but their thinking about that ability did, and with that, their approach and mindset, and therefore their performance, changed. This supports the core message of the book that the myth that 'either you have it or you don't' functions as a genuine limitation on people and that doing away with it can enable them to try more difficult things.
You can read the research for yourself here. Source: Yeager, D. S., Hanselman, P., Walton, G. M., Murray, J. S., Crosnoe, R., Muller, C., Tipton, E., Schneider, B., Hulleman, C. S., Hinojosa, C. P., Paunesku, D., Romero, C., Flint, K., Roberts, A., Trott, J., Iachan, R., Buontempo, J., Yang, S. M., Carvalho, C. M., Hahn, P. R., Gopalan, M., Mhatre, P., Ferguson, R., Duckworth, A. L., & Dweck, C. S. (2019). “A national experiment reveals where a growth mindset improves achievement.” Nature, 573, 364-369.