Transcript
Cal Newport (0:00)
Imagine if I could offer you a pill that gave you the following benefits. One, your symptoms of anxiety and depression would significantly reduce. Two, your overall sense of moment to moment life satisfaction would improve. And three, you would gain substantially more ability to concentrate. Now, to make this even more enticing, let's say this pill would deliver you those benefits in only two weeks. If such a drug existed, it would be a blockbuster. Now, the bad news is there is no such pill that can do this. The good news, however, is that according to a major new research paper, there's a simple intervention for your digital habits that can deliver all of those promises. I'm talking about something that's free and that you can put in place with minimal preparation, something that you could start implementing today. Well, it's Monday, which means it's time for an advice episode of this show. And clearly this is a perfect type of topic to dive deeply into. So here's what we're going to do. I have the paper here. We're going to go through it. I'll start by describing the intervention they studied and quantified the exact benefits that they measured. Then we'll look closer at the mechanisms that the researchers believe explain why this intervention works so well. And then we'll end with three pieces of advice of my own for how to maximize the chances that you will succeed with this intervention and if you choose to try it. So if you've been fed up with your distracted digital life, this is an episode you definitely need to hear. As always, I'm Cal Newport, and this is Deep Questions, the show for People Seeking Depth in a Distracted world. All right, so we're going to proceed here by addressing three key questions. The first question, what was the intervention studied in this research paper? Well, if you look at the title of the paper, it sort of gives it away. Here is the title. Blocking Mobile Internet on Smartphones Improves Sustained Attention, Mental Health, and Subjective well being. All right, let's look a little bit closer at this. What do they mean by block blocking mobile Internet? Well, they used an app blocking tool called Freedom. And what they did is they set it up to block Internet powered apps like social media and the web browser, but leave things like instant messaging and phone calls alone. This is key, as a lot of people know, especially parents in the audience. You need the ability to have a phone on which you can do calls or messages or WhatsApp. I checked it recently, Jesse. I'm on three different parental WhatsApp groups right now that I have to monitor. And with three kids in school I would say I get called by the school nurse like roughly once a month. All right, so they figured out how to block the Internet without making you have to live without the other functional benefits of a smartphone. Now here's what's critical about this research. Part of what made it good was they could then check compliance. They could look at the log produced by the blocking software and make sure that their research subjects actually kept the blocking on, that they weren't occasionally going around it. So that made a big difference. Then to get even better results, they did something even more impressive. They made this a randomized control trial. So they recruited a group of participants and then randomly divided them into a group that was going to have the Internet blocking and then a group that was not. So that they could really be comparing what was the difference between these two groups and not accidentally measuring things like self selection effects. As the experiment went on, they could measure the impact with various means. They had surveys that they would have the participants filled out. They had various tests like test of attention that they would have the participants do at various times. And they would do something called random experience sampling where they would randomly text the participants and say, hey, tell me right now in this moment how you are feeling. This is sort of the gold standard in social psychology for measuring people's subjective well being on average. Okay, so that was the experiment and they had the intervention group do this for two weeks while the control group did not. And then there were some more complexities after that where then they swapped and the control group started using them and they measured what happened with the intervention group for the week that followed. But that was the core of the experiment. What did they find? Well, I'm going to put a couple plots up on the screen here for people who are watching. Okay, so this first plot here is looking at sustained attention ability. I want you to look at the blue lines. This is the intervention group. And between the beginning of the experience and time point two, so two is after two weeks we see this blue line goes way up, a marked increase in the ability to pay attention. Then as we go forward, it falls a little bit, but not all the way back down the baseline. So even after they started using their phone for the Internet again, they still had some attention left. All right, what about mental health? An even more dramatic effect here. Look at this blue line. That's the intervention group. One is right before the experiment starts. Look at how high that jumps up. By the end of the experiment, it's a massive increase. And look what happens when they measured in at the third time point after they started using their phones again, though mental health began going down. They had a long after effect of benefits from spending those two weeks without mobile Internet. Here's the third chart. Subjective well being. Once again, look at that blue line. From the beginning of the experiment to the end of the two week period, we see a massive jump. And again, as we go from time period two to time period three and they start using their phones again, it falls. But we still get some after effect benefits from the two weeks they spent without using their phone. So these are notable results and they were delivered really fast in these sort of prospective randomized control studies where you're really comparing one group to another. To see such a large jump on such important metrics in only two weeks is pretty rare. It gives us the sense that maybe we were underestimating just how much damage to our ability to pay attention, our mental health and our subjective well being. Maybe we were really underestimating what a hit we were taking by being using the Internet on our phone so constantly. All right, so those results then motivate a natural follow up question. That's what they saw. But why did they see that? What were the mechanisms that mediated these improvements in those factors when they stopped using mobile Internet on their phone? So that's our second question here. What explains these results? Now, fortunately, the researchers also looked at this question. They measured many factors during the experiment before and after to try to figure out what changed during the period of not using mobile Internet. That seems at least like it's likely candid to be mediating the positive results that they saw. Well, the first thing they looked at was just the obvious top line number. When you take mobile Internet off of your phone, how much less do you look at it? And they discovered that actually significantly less. The average daily screen time before the experiment began was 304 minutes. By the end of the experiment that had dropped down to 161 minutes. So they basically dropped the amount of time they're looking at their screens by about a factor of two when you took mobile Internet off of the phones. Okay, so they freed up this sort of 150 or so minutes each day that they used to be looking at mobile Internet devices. How did this then lead to them being happier, less mental health impacts and ability to focus more? Well, the researchers went on to isolate four what they called mediation factors that emerged as having strong changes during the experimental period. And it's their best guesses at what is actually mediating the positive dependent variable effects. So here's the four mediation factors that they measured. During the experimental period, the subject spent more time doing meaningful offline activities. They experienced more social interaction, they slept more and their sense of self control increased. Let's think about those for a second. So the first three meaningful offline activities, more social interaction and more sleeping. The researchers are saying this is probably just a straight up time reallocation. That is where that 150 minutes that used to be looking at Internet connected apps on the phone, that's where it went. They just reallocated it towards activities that had much more positive impacts on their daily life. Now here's what this tells me. If we see pretty consistently that once you take highly optimized Internet distract power, distracting apps off of phones, if we see this in the research, the subjects
