How Your Cell Phone Might Affect Your Brain

We use our phones for many things, from making business calls to checking our email to communicating with friends and loved ones. Our phones have become an inextricable part of our lives. But does this reliance on smartphones have any impact on our brains?

Some recent research indicates that it might. Experts suggest that all of this phone use might affect our social and emotional regulation skills, disrupt our sleep, and turn us into lazy thinkers.

Kids are also using these devices more and more, which has led experts to question the possible long-term effects on development. One study published in JAMA Pediatrics found that the amount of time kids spend staring at digital screens rose 52% over a three-year period.

How this might affect development remains to be seen. However, it is a question of interest for healthcare practitioners, mental health professionals, educators, parents, and anyone who uses a smartphone regularly.

Phone Use Can Negatively Affect Cognitive Ability

Recent research suggests that smartphone usage does indeed affect the brain. Remember, however, that such research is still in the early stages. While we know a bit more about some of the short-term effects, the long-term effects remain to be seen. 

Changes in Brain Chemistry

Some evidence indicates that using mobile phones might lead to chemical changes in the brain. In one study presented to the Radiological Society of North America, researchers found that young people with a so-called internet and smartphone addiction actually demonstrated imbalances in brain chemistry compared to a control group.

Reduced Cognitive Capacity

One well-known study in the Journal of the Association for Consumer Research found that cognitive capacity was significantly reduced whenever a smartphone is within reach, even when the phone is off.

Researchers dubbed this effect the "brain drain hypothesis." Essentially, we are less likely to rely on our own cognitive resources if we know an information source is readily available.

A more recent meta-analysis also found that the presence of a smartphone was associated with decreases in working memory. This is consistent with earlier results, but the newer analysis indicates that the magnitude of this effect might not be as pronounced as previously believed.

One factor that researchers think might play a part in how strongly people are affected by this: FOMO, or the fear of missing out. Being distracted by our phones suggests that we are always, on some level, thinking about what is happening in the online world—and what we might be missing when we aren't using our phones.

Worse Reading Comprehension

You've probably noticed that how you read online text differs from how you read the printed page. For many of us, it's common to skim online articles or skip around the page to find key points. But this isn't the only difference. Some evidence indicates that we understand less of what we read online than what we do in print.

One 2020 study found that reading on an electronic device such as a smartphone results in lower reading comprehension.

The exact reasons for this are unclear, but researchers have found that people sigh less often when reading on a smartphone. This impact on respiration is also associated with excess activity in the brain's prefrontal cortex and reduced reading comprehension.

Phone Affects Social-Emotional Skills

In the commentary appearing in the journal Pediatrics, researchers from the Boston University School of Medicine took a closer look at the available literature on smartphone and iPad use among very young children.

The concern, researchers suggest is that kids will not develop their own internal self-regulation mechanisms if they always rely on being distracted by a digital device.

The experts suggest that hands-on activities and those involving direct human interaction are superior to interactive screen games. The use of mobile devices becomes especially problematic when such devices replace hands-on activities that help develop visual-motor and sensorimotor skills.

Phone Use May Lead to Disrupted Sleep

Using your smartphone or tablet at bedtime might be interfering with your sleep, and not because you’re staying up late to check your email, scrolling through your social media feeds, or playing a game of online trivia.

In a study published in the Proceeding of the National Academy of Sciences, a dozen adult participants were asked to either read on an iPad for four hours each night before bed or read printed books in dim lighting. After five consecutive nights, the two groups switched.

What the researchers discovered was that those who had read on an iPad before bedtime displayed a reduction in levels of melatonin, a hormone that increases throughout the evening and induces sleepiness. It also took these participants longer to fall asleep, and they experienced less REM sleep throughout the night.

The culprit? The type of blue light emitted by most mobile devices. The cells at the back of the eyes contain a light-sensitive protein that picks up specific wavelengths of light. These light-sensitive cells then send signals to the brain's "clock, " which regulates circadian rhythms.

Typically, blue light peaks in the morning, signaling your body to wake up for the day. Red light increases in the evening, signaling it is time to wind down and go to bed. By interrupting this natural cycle with the blue light emitted by mobile devices, the normal sleep-wake cycles are thrown out of whack.

These sleep interruptions can hurt your brain and mental health. Poor sleep is associated with various mental health problems, including mood changes, stress, anxiety, depression, and brain fog.

Our Phones Might Be Making Us Mentally Lazy

Mobile devices don't just offer distraction—we also rely on them to provide information. We no longer have to memorize phone numbers or keep a Rolodex on our desks—all that information is conveniently stored on our phone’s contact list.

Instead of mulling over questions you might have about the world around you, you can just grab your phone and Google the answers. Instead of trying to remember appointments, meetings, or dates, you simply rely on an iPhone app to remind you of what you need to accomplish each day.

And some experts warn that this over-reliance on your mobile device for all the answers might lead to mental laziness. One study has found that there is a link between relying on a smartphone and mental laziness.

Researchers suggest that this can interfere with analytical and logical thinking. Some even wonder if using our phones too much might contribute to decreased intelligence.

Clearly, much more research is needed. Experts warn, however, that the use of mobile devices has far out-paced the available research on the subject. Scientists and doctors are just beginning to understand the potential short-term (and long-term) effects of smartphone use on the brain.

Mobile devices are bound to have their detriments, but the researchers also suggest that we have yet to fully understand how they might benefit the brain.

Follow Now: Apple Podcasts / Spotify / Google Podcasts

So What Can You Do to Protect Your Brain?

Even though we might know that our phones might negatively affect our brains, the reality is that we need them. For many, they are a connection to information, resources, tools, and communication that are essential for daily life.

What we can do is work on becoming more intentional about how we use and interact with our phones. Strategies that can help:

Build Awareness

We need to know what we are dealing with before we can take steps to address it. This means tracking and assessing how much you are using your phone.

What are you using it for? What's your average daily screen time? Do you use your phone to soothe difficult emotions or avoid important tasks? Answering such questions can give you insight into problems you might want to address. 

Consider Setting Limits

Setting specific limits on your phone use can be helpful. It's important to be purposeful about your mobile phone use, but you should also consider what works for you.

For some people, this might involve removing certain apps from their phones. Others may find it helpful to use apps or phone settings to control how long they use certain apps or websites each day.

Some people find that it is helpful to have phone-free times or even entire days. For example, you might decide you won't use your phone after 7 PM or on Saturdays so you can fully focus on the other people in your life.