Many people experience the phenomenon of mind blanking: you’re in the middle of a task, reading a sentence, or just staring off into space, when suddenly, you realize you weren’t thinking about anything at all. Your mind, it seems, just went blank.
But what exactly is “mind blanking”? And is it the same as daydreaming or zoning out?
A new article, published recently in Trends in Cognitive Sciences, aims to answer those questions. Written by a multidisciplinary team of neuroscientists and philosophers from around the world, the paper brings together findings from 80 studies, including their own brain imaging research, to define and explore the elusive mental state of mind blanking.
“The experience of a ‘blank mind’ is as intimate and direct as that of bearing thoughts,” co-author Jennifer Windt of Monash University said in a recent statement. “Our aim here is to start a conversation and see how mind blanking relates to other seemingly similar experiences, such as meditation.”
Unlike “mind wandering,” where thoughts drift from topic to topic, mind blanking is a more complete pause in conscious awareness. The authors argue it’s a distinct and meaningful phenomenon that challenges the common assumption that our minds are always thinking.
Tracking the Brain During Mind Blanking
To understand what happens when the mind goes blank, the team reviewed a wide range of studies that measured subjective experiences and neural activity. These studies used tools like EEG (electroencephalography) and fMRI to observe the brain in real time.
When people reported feeling mentally blank—especially after periods of intense focus or sleep deprivation—the researchers noticed changes in brain function that resembled drowsiness or even brief moments of local “sleep.”
During these episodes, people’s heart rates slowed, their pupils shrank, and their brains showed reduced signal complexity, a sign often associated with unconsciousness. The researchers also saw disruptions in sensory processing and the emergence of slow, sleep-like brain waves.
“We describe these states as ‘local sleep episodes,’” the authors wrote—parts of the brain dozing off even while a person remains awake.
In other scenarios, mind blanking was linked to high-speed thinking that temporarily overwhelmed the brain. The team observed deactivation in regions related to speech, memory, and voluntary control—like Broca’s area and the hippocampus—when people were actively asked to “empty their minds.”
Rethinking Consciousness of a Blank Mind
One of the most surprising findings from this work is how common mind blanking is. The researchers estimate that people experience blank states around 5% to 20% of the time, especially during tasks that require long periods of attention or after intense physical or mental effort.
Mind blanking has also been observed more frequently in certain clinical conditions. People with ADHD, generalized anxiety disorder, and brain injuries are more likely to report these experiences, and blanking is even part of diagnostic criteria for some disorders, like Kleine–Levin syndrome.
The authors propose that mind blanking is not a single experience, but a family of related states driven by changes in arousal, or the degree of alertness or drowsiness in the brain. Whether caused by fatigue, distraction, or intentional meditation, these states may all share a common physiological root.
“We believe that the investigation of mind blanking is insightful, important, and timely,” said lead author Thomas Andrillon. “Insightful because it challenges the common conception that wakefulness involves a constant stream of thoughts. Important because mind blanking highlights the interindividual differences in subjective experience.”
Ultimately, the team hopes that future research will take mind blanking seriously, not as a failure of attention, but as a natural, dynamic part of the conscious experience.
“Collectively,” they write, “we stress that ongoing experiences come in shades with varying degrees of awareness and richness of content.” Even a quiet mind, it turns out, can speak volumes about how the brain works.
Kenna Hughes-Castleberry is a freelance science journalist and staff writer at The Debrief. Follow and connect with her on BlueSky or contact her via email at kenna@thedebrief.org