Neurologist: “Stone Age” brains of humans are not equipped to handle information overload from modern technology

12/22/2024 / By Zoey Sky

Modern technology, particularly smartphones and streaming services, has significantly reduced human attention spans, with studies suggesting an average of just eight seconds—less than a goldfish.
The human brain, largely unchanged since prehistoric times, is ill-equipped to process the overwhelming visual and sensory overload of modern screens.
Prolonged screen use has numerous detrimental effects, including cognitive decline, insomnia, eye strain, musculoskeletal pain, addictive behaviors and reduced physical activity.
Experts recommend limiting recreational screen time to less than two hours daily for adults, with additional time spent on non-screen activities. For children, excessive screen time can lead to sleep problems, lower academic performance and exposure to inappropriate content.
Practical strategies include turning off notifications, setting timers, avoiding phones in the bedroom and replacing screen time with physical activities or hobbies.

In the age of smartphones, streaming services and endless social media scrolling, it’s no secret that your attention span is often under siege. What once seemed like a harmless joke – that humans now have shorter attention spans than goldfish – has become a sobering reality backed by scientific research.

The culprit? Modern technology and the relentless bombardment of screen-based distractions.

Richard E. Cytowic, a neurologist and the author of “Your Stone Age Brain in the Screen Age: Coping with Digital Distraction and Sensory Overload,” warned that the human brain, which has been largely unchanged since prehistoric times, is ill-equipped to handle the onslaught of digital stimuli humans face daily.

Stone Age brains were designed to process the natural world – sights, sounds and tastes – not the constant barrage of notifications, videos, and information that define modern life.

This mismatch between ancient biology and modern technology is wreaking havoc on the average human’s ability to focus.

The human brain operates within strict energy constraints. It’s like a computer with limited processing power and battery life.

When you’re bombarded with too much information or too many distractions, the brain becomes overloaded, leading to stress. Stress, in turn, triggers distraction, which often results in errors or poor decision-making. This vicious cycle is at the heart of the attention span crisis.

Cytowic explained that the brain is wired to prioritize vision over other senses. However, with eye-to-brain connections outnumbering ear-to-brain connections by a factor of three, it’s no wonder that screens – with their vivid colors, moving images and endless content – dominate human attention.

Smartphones, in particular, are designed to exploit this evolutionary quirk, making them irresistible to Stone Age brains.

Information overload: A modern epidemic

The concept of “information overload” isn’t new. In 1970, futurist Alvin Toffler warned in his book “Future Shock” that humans would become increasingly dependent on technology, unable to cope with the sheer volume of information they encountered.

Fast forward to today, and his predictions have come true.

Americans now consume five times as much information daily as they did just 25 years ago. Even digital natives—or people born into a world of technology—complain about the stress and distraction caused by their devices.

Visual overload is the primary culprit. Unlike sound, which requires time to process, visual information is processed almost instantaneously.

This means that screens can deliver a constant stream of stimuli, leaving little room for the brain to rest or focus.

The result? A society that’s increasingly unable to sustain attention on anything for more than a few seconds.

Studies suggest that attention spans have plummeted to an average of eight seconds—less than that of a goldfish. While this statistic is often debated, the broader trend is undeniable: Humans are losing their ability to focus.

Research by Gloria Mark at the University of California, Irvine, found that people now switch between tasks every 47 seconds, down from 150 seconds in 2004. This constant switching, or “attention leaking,” is akin to having a gas tank that’s constantly losing fuel.

Neuroscientists distinguish between different types of attention: Sustained, selective and alternating. Sustained attention allows you to focus on a single task for an extended period, while selective attention helps you filter out distractions.

Alternating attention enables you to switch between tasks. Unfortunately, modern life demands all three types of attention simultaneously, pushing your brain to its limits. The result is a decline in focus, memory lapses and reduced cognitive performance.

Negative effects of too much screen time

The consequences of excessive screen time go far beyond a shrinking attention span.

Here are some of the most concerning effects of too much screen time:

Cognitive decline

Studies have linked excessive screen time to problems with brain function, including impaired memory and reduced cognitive performance.

Insomnia and poor sleep quality

The blue light emitted by screens disrupts the production of melatonin, the hormone that regulates sleep. Combined with the constant input of information throughout the day, and it’s no wonder that many people struggle to unwind at night because of insomnia or poor sleep habits.

Eye strain and headaches

Prolonged screen use can cause eye fatigue, blurred vision and headaches. The glare and brightness of screens only exacerbate these issues.

Musculoskeletal pain

Sitting for hours in front of a computer or holding a phone in a hunched position can strain the neck, shoulders and back, leading to chronic pain.

Addictive behaviors

Smartphones and social media are designed to be addictive, triggering cravings and withdrawal symptoms when users are unable to access them. This can lead to compulsive behaviors that interfere with daily life.

Reduced physical activity

Time spent on screens is time taken away from physical activity. A sedentary lifestyle increases the risk of obesity and other health problems.

Tips for reducing screen time

While there’s no universal guideline for how much screen time is “healthy,” experts generally agree that adults should limit recreational screen time to less than two hours per day. Any additional time should be spent engaging in physical activity or other non-screen-based hobbies.

For children, the stakes are even higher. On average, kids aged eight to 12 spend four to six hours a day on screens, while teens spend up to nine hours.

Excessive screen time can lead to sleep problems, lower grades and a host of other issues, including exposure to inappropriate content and cyberbullying. (Related: Less drama and fewer distractions: Minnesota middle school students happier after smartphone ban.)

Reducing screen time isn’t easy, especially if you’re on your phone or computer a lot, but it’s essential for maintaining mental and physical health.

Here are some practical tips on how to reduce screen time:

Turn off notifications

There’s a reason your brain is always on alert the minute the notification sound on your phone goes off.

Notifications are designed to grab your attention, often leading to unnecessary screen time. Disable them to create a more peaceful environment.

Set timers

Use a timer to limit your screen time. When the timer goes off, put down your device and engage in an activity that doesn’t involve a screen.

Don’t keep your phone in your bedroom

Avoid scrolling before bed or first thing in the morning. Use an alarm clock instead of your phone to wake up.

Encourage non-screen activities

Replace screen time with physical activity, reading or hobbies that don’t involve technology.

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