Why blinking matters for focus, time perception and dopamine

The Short Version

In three different Huberman Lab episodes, on ADHD, on time perception and on creativity, Andrew Huberman keeps returning to something most of us never notice: the blink. In each one, he ties blink rate to dopamine, and in two of them he ties blinks to how the brain slices up time, citing a Current Biology paper by Terhune and colleagues titled Time Dilates After Spontaneous Blinking [1][2][3]. In the creativity episode, spontaneous blink rate serves as a noninvasive research marker of dopamine in the pathway behind divergent thinking [4]. The practical side comes mostly from the ADHD episode, where a short visual focus training that includes controlling blinks improved attention in schoolchildren [1][2]. One caution runs through all of it: the episodes disagree on which way the link goes, with the ADHD episode saying higher dopamine and stimulants mean fewer blinks [1][2], and the time perception episode saying higher dopamine and arousal go with more blinks [3]; the creativity episode, which uses blink rate as a dopamine marker and notes that people with Parkinson's disease often don't blink at all, does not state a direction but fits the second view more easily [4].

Table of contents

What They Said

All four sources are solo Huberman Lab episodes; sources [1] and [2] are two summaries of the same ADHD episode. So this is one teacher's account across three topics rather than a panel of experts, and it is worth reading that way.

The ADHD episode: blinks as a clapperboard, and as a trainable tool

Huberman's ADHD episode reaches blinking by way of time. People with ADHD, he explains, often have difficulty with time perception: running late, procrastinating and underestimating how long things take [1][2]. He then cites the Current Biology paper by Terhune and colleagues, Time Dilates After Spontaneous Blinking [1][2]. His description of the finding: "right after blinks we reset our perception of time" [1].

He makes the idea concrete with a film set. "Blinks in that sense are a little bit like the curtain coming down on a scene between scenes in a play or takes in a movie," he says, describing the clapperboard that marks the start and end of a take: "when you blink it's a take" [1].

From there he links blinking to the chemistry of attention. "The rate of blinking is controlled by dopamine," he says, "and therefore the dopamine and blinking system is one way that you constantly modulate and update your perception of time" [1]. He describes the study's takeaway as twofold: "blinking controls time perception but also that levels of dopamine can alter your sense of time," and "blinking and dopamine are inextricably linked they are working together to control your attention" [1].

The dopamine side of time perception is where ADHD comes in. "When dopamine levels go up people tend to over estimate how long something lasted," Huberman says, because "they are processing time more finally it's slow motion mode" [1]. When dopamine is lower, people "tend to underestimate time intervals" [1]. He connects that directly to the low dopamine picture of ADHD that he lays out earlier in the episode, drawing on a 2015 paper by Spencer and colleagues in Biological Psychiatry that formalized the low dopamine hypothesis [1][2]. People with ADHD, he says, "are not just disorganized in space," but "disorganized in time their dopamine is low we know that as well and so they are underestimating time intervals and so it makes perfect sense that they would be late" [1].

Then comes the turn he calls "really exciting": the finding implies that "children with ADHD adults with ADHD or people with normal levels of focus that want to improve their ability to focus can do so," through "a training that involves learning how often to blink and when and how to keep their visual focus on a given target and it turns out this study has actually been done" [1].

The study he means is titled Improvement of Attention in Elementary School Students through Fixation Focus Training Activity [1][2]. The children first did some physical movement, then held their visual focus on a close target, their hand, for about 30 to 60 seconds, then on targets progressively farther across the room, for only a few minutes a day [1][2]. Focus on other material improved significantly, with blink control a key component [1][2].

Huberman explains the movement step through fidgeting. Schools now let kids with ADHD use fidget tools such as a rubber band on the desk, giving restless premotor circuits an outlet [1][2]. He draws on his own experience in brain surgery: the harder you try to hold your hands still, the more they shake, but subtly tapping a foot or bouncing a knee steadies them [1][2]. The same logic, he says, applies to public speaking: "if you're nervous that's why bouncing your knee behind the podium works as well that's why nodding your head and gesticulating can help" [1]. He is clear about the mechanism: "It's not a matter of quote unquote moving energy out of the body that doesn't actually happen" [1]. Instead, he says, you are engaging the premotor circuits and giving them an outlet, so that the rest of your body and your mental attention can stay locked on to what we call focus [1].

He also describes how everyday substances and states shift blinking. "Most all of the drugs riddle in adder all and recreational drugs that increase dopamine even coffee and tea and other forms of caffeine they tend to make us blink less and when we get tired we tend to blink more," he says, calling it "sort of a duh" once you picture being "wide eyed with excitement or fear" [1]. The eyelids, in his framing, "aren't just there for winking and they aren't just there for cosmetic purposes they are there to do the work," regulating "the amount of information going into your nervous system" and "how long you are bringing information into your nervous system and in what bins" [1].

That work has two parts in his account. Time "is set by how often you blink," while how widely or narrowly you take in the visual world is set by whether you are viewing things "through a soda straw view" or in "this panoramic sort of whole environment mode this kind of fisheye lens or wide angle lens mode" [1]. Panoramic vision returns elsewhere in the episode as a tool of its own, discussed below [1][2].

Finally, he describes a paper titled, in his reading, "decreased spontaneous eye blink rates in chronic cannabis users" [1]. People who had not used cannabis, or had used it for about two years, blinked much more than people who had used it chronically for ten years: "people who be using cannabis for 10 years don't blink very often at all" [1]. He explains that cannabis increases dopamine transmission but also raises serotonin and parts of the cannabinoid and opioid systems, creating "that kind of alert but mellow feel" [1]. His summary of the result: "marijuana seems to increase people's focus but then they can't remember what they were focusing on" [1]. He adds that he is not a proponent and does not use cannabis himself [1].

A different kind of blink: attentional blinks

The ADHD episode also discusses attentional blinks, which are not eye blinks but are easy to confuse with them [1][2]. Drawing on the book Altered Traits by Daniel Goleman and Richard Davidson, Huberman explains that when you find Waldo, your brain briefly celebrates and you miss a second Waldo right next to him [1][2]. In the lab, people watching a fast stream of characters for an R and a Z tend to spot the R and miss the Z, even though they can see either one alone [2]. People with ADHD, children and adults, have many more of these attentional blinks, which suggests their problem may partly be over-focusing on some things and missing others rather than an inability to focus [1][2].

The remedy here is open monitoring [1][2]. One route is panoramic vision, deliberately dilating your gaze so you take in the ceiling, floor and walls while still looking ahead, which engages visual pathways that are also better at processing events in time [1][2]. The other is a single session of about 17 minutes sitting quietly with eyes closed, attending to breathing and body sensations and returning when the mind drifts; published studies, Huberman says, found it significantly reduced attentional blinks in a near-permanent way without further training [1][2]. Attentional blinks also increase with age, and researchers are exploring whether the practice can offset age-related decline [2]. Huberman does not expect anyone to take up regular meditation, but thinks most people could manage one 17-minute session [2].

The ADHD episode treats eye blinks and attentional blinks as separate phenomena with separate tools [1][2].

The time perception episode: "a shutter on our experience"

In his episode on time perception, Huberman builds a framework in which dopamine and norepinephrine raise the brain's "frame rate" and serotonin lowers it [3]. "The more dopamine that is released into our brain, the more we tend to overestimate how much time has passed," he says [3]. Asked to signal when a minute is up, people with elevated dopamine might call it at the 38-second mark; serotonin-raising drugs, and cannabis, make people underestimate time, letting six minutes pass when asked to mark five [3]. His analogy is a camera: slow motion comes from shooting at high frame rates, such as 4,000 frames per second instead of 30, and dopamine fine-slices experience the same way [3].

Blinking arrives as one of the episode's tools. He cites the same Terhune paper, Time Dilates After Spontaneous Blinking [3]. "One of the ways that we find sliced time is by blinking," he says [3]. "We think of blinking as just a thing to like lubricate our eyes or to limit the amount of light coming into our eyes. But it's a shutter on our experience" [3]. He ties it to a principle he repeats across his work: "cognitive attention follows visual attention, at least for sighted individuals" [3].

On the chemistry, this episode points the other way from the ADHD episode. "Dopamine and increases in dopamine are associated with increases in spontaneous blink rate," Huberman says here [3]. As arousal rises, "pupils, dilate, heart rate increases, etc. But also blink rate increases" [3]. Each blink, in this account, shifts time perception toward overestimation, suggesting blink rate is tied to frame rate [3]. In principle, he says, blinking less would slow your perception of time and blinking more would speed it up, though you would miss more when blinking [3].

The same episode places blinking inside a larger set of dopamine effects on time. Dopamine and norepinephrine appear to dominate roughly the first half of the waking day and serotonin rises toward evening, so "early in the day you are a much more high resolution camera, so to speak, then you are later in the day" [3]. That leads to his advice to do rigid, rule-bound work early and creative, brainstorming work later [3]. He also notes that poor sleep blurs these daily phases [3].

The creativity episode: blink rate as a window on dopamine and mood

In the creativity episode, blinking is a measurement rather than a tool. Huberman describes the work of researchers Chermahini and Hommel in the Netherlands, who linked spontaneous blink rate, which he describes as a noninvasive marker of dopamine in the nigrostriatal pathway, with mood and divergent thinking [4]. The nigrostriatal pathway, from the substantia nigra to the dorsal striatum, controls body and eye movements and, in his account, underlies divergent thinking, the idea-generating half of creativity [4].

What the research shows, as he presents it, is an inverted relationship at the top end. A good mood with elevated dopamine makes divergent thinking easy, but very high dopamine hurts it, as in mania or with stimulant drugs, where people fixate on one narrow tunnel of ideas [4]. People in a low mood, around 2 to 4 out of 10, struggle with divergent thinking but respond well to mood-lifting input such as music they love, inspiring stories or exercise, while people already in a high mood do worse if they add more stimulation [4].

His clinical example points in the same direction as the time perception episode. People with Parkinson's disease, who have selective deficits of dopamine in the substantia nigra and nigrostriatal pathway, "show deficits in what? In movement, in the smoothness of movement, oftentimes they won't blink at all. They'll have kind of a blank stare" [4].

The same episode adds two related notes. Caffeine, Huberman says, increases the density and effectiveness of dopamine receptors and favors focus; he recommends avoiding it before divergent thinking and using it, at 1 to 3 milligrams per kilogram of body weight, before convergent work [4]. And high-THC cannabis can boost divergent thinking so much that the ideas "cannot be implemented into a coherent framework," or, as is often the case, people "simply can't remember what they were thinking about" [4], an echo of the cannabis remark in the ADHD episode [1].

Where They Agree, and Where They Don't

They agree that blinking and dopamine are linked. The ADHD episode says "the rate of blinking is controlled by dopamine" [1]. The time perception episode says increases in dopamine are associated with changes in spontaneous blink rate [3]. The creativity episode treats spontaneous blink rate as a noninvasive marker of nigrostriatal dopamine [4]. In all three, blinking is a readout of a neurochemical state, not just eye lubrication [1][3][4].

They agree that blinks shape time perception. Both the ADHD and time perception episodes cite the Terhune paper and describe blinks as markers that cut experience into pieces: a take on a film set in one telling [1], a shutter on experience in the other [3]. Both also agree that higher dopamine makes people overestimate how much time has passed, and lower dopamine makes them underestimate it [1][3].

They share a caution about cannabis. Only the ADHD episode reports a blink finding here: chronic cannabis users blink far less [1][2]. What the ADHD and creativity episodes share is the cost to memory, for what was focused on or what was thought about [1][4].

They disagree on the direction of the dopamine link. This is the plainest conflict in the sources, and it is a real one:

• In the ADHD episode, higher dopamine means fewer blinks. Huberman says drugs that increase dopamine, including Ritalin, Adderall and even coffee and tea, "tend to make us blink less," while fatigue makes us blink more [1], and that "dopamine and heightened levels of alertness and excitement tend to make us blink less and attend more" [1]. The other summary of the episode reports the same: higher dopamine, fewer blinks and finer slicing of time [2]. His reasoning draws on the familiar picture of being wide-eyed with excitement or fear, against eyes that can barely stay open when tired [1], and on the cannabis study showing low blink rates in long-term users [1].
• In the time perception episode, higher dopamine means more blinks. "Dopamine and increases in dopamine are associated with increases in spontaneous blink rate," he says, listing faster blinking alongside dilated pupils and a faster heart rate as signs of arousal [3].
• The creativity episode fits the second view. It uses spontaneous blink rate as a marker of nigrostriatal dopamine and offers Parkinson's disease, which depletes that dopamine, as a condition in which people "oftentimes they won't blink at all" [4].

The sources do not reconcile these accounts. Two details are worth holding onto. First, the ADHD episode's own cannabis example shows a drug that increases dopamine transmission while blink rates fall, though Huberman notes it also raises serotonin and parts of the cannabinoid and opioid systems [1]. Second, the creativity episode ties blinking specifically to one dopamine pathway, the nigrostriatal pathway that controls body and eye movements [4], while the ADHD episode speaks of dopamine and stimulants more broadly [1]. What all three episodes share is the claim that blinking and dopamine are linked; which way the link runs is where they part.

They differ in what blinking is for. In the ADHD episode, blinking is something you can train as part of a focus practice [1][2]. In the time perception episode, it is a possible lever on how fast time seems to pass [3]. In the creativity episode, it is only a research measure of a brain state that matters for idea generation, with no instruction to change it [4].

Why It Works

The mechanisms these sources give fall into four parts.

Blinks as time markers. According to the Terhune paper as Huberman describes it, "right after blinks we reset our perception of time" [1]. Each blink acts like the clapperboard marking a take [1] or a shutter on experience [3]. If blinks mark the edges of perceived moments, then how often they happen bears on how finely time is sliced [1][3].

Dopamine as the frame rate. In Huberman's framework, dopamine and norepinephrine raise the brain's frame rate, so that more dopamine means fine slicing and overestimating elapsed time, while serotonin does the opposite [3]. In the ADHD episode, low dopamine in particular circuits leads to "unnecessary firing of neurons in the brain that are unrelated to the task that one is trying to do" [1], and the same low dopamine leads people to underestimate time intervals and run late [1]. Blinking sits inside this system: "blinking and dopamine are inextricably linked they are working together to control your attention" [1].

Eyes as a gate on information. Huberman describes the eyelids as regulating "the amount of information going into your nervous system" and "how long you are bringing information into your nervous system and in what bins" [1]. Combined with the principle that "cognitive attention follows visual attention" [3], this is the reasoning behind training visual focus and blinks as a route to mental focus [1][3].

Movement before stillness. The fixation training starts with physical movement because restless premotor circuits need an outlet, Huberman says; giving them one lets the rest of the body and attention stay "locked on" [1][2].

Blink rate as a mood and dopamine readout. In the creativity research he describes, spontaneous blink rate is a noninvasive way to estimate nigrostriatal dopamine, which links mood to divergent thinking along an inverted relationship where too much dopamine narrows ideas into a tunnel [4].

The evidence behind these mechanisms, as presented, is a handful of named studies: the Terhune paper in Current Biology [1][2][3], the elementary school fixation focus training study [1][2], the chronic cannabis blink-rate paper [1], and the work of Chermahini and Hommel on blink rate, mood and divergent thinking [4]. The sources give no numbers on how large the effects of blink training were beyond describing the improvement in focus as significant [1][2].

Where It Applies, and Where It Doesn't

The best-described protocol is for children. The fixation focus training study was done with elementary school students [1][2]. Huberman says the finding means children with ADHD, adults with ADHD and people with normal levels of focus can improve [1], but the study he describes is the school study.

Blink training sits beside other ADHD treatments, not in place of them. The ADHD episode places behavioral tools alongside medication, diet and supplements, and uses a distinction between things that mediate attention directly, like dopamine circuits, and things that modulate it, like sleep and diet [1][2]. Huberman repeatedly warns listeners not to self-diagnose and says a real diagnosis should come from a psychiatrist, physician or well-trained clinical psychologist [1][2]. He also suggests the best use of medication may be pairing it with deliberate behavioral focus training while the brain is in a more plastic state, then possibly tapering off [1].

Blink rate as a research measure is not a home test. The creativity episode uses blink rate as a marker in research on mood and divergent thinking [4]. It does not suggest counting your own blinks, and because the sources disagree on whether more dopamine means more or fewer blinks [1][3][4], readers should not try to read their own dopamine from their blink rate.

Changing blink rate to change time is offered in principle. The time perception episode says that, in principle, blinking less or more would shift your perception of time, and adds that you would miss more while blinking [3]. It is presented as an implication of the research, not as a tested protocol [3].

Eye blinks and attentional blinks are different things. The 17-minute open-monitoring session and panoramic vision address attentional blinks, the moments when the brain misses a second target after spotting the first [1][2]. The fixation training addresses visual focus and eye blinks [1][2]. Both serve attention, but they are separate tools in the sources.

Substances complicate the picture. Stimulants and caffeine change blinking, according to the ADHD episode [1], and cannabis is associated with very low blink rates in long-term users along with problems remembering what was focused on [1][2]. The creativity episode warns that very high dopamine, as with stimulant drugs, hurts divergent thinking [4]. More dopamine is not automatically better for the kind of attention you need.

What To Do With It

These steps are drawn from the sources; anyone who suspects ADHD in themselves or a child should get an evaluation from a psychiatrist, physician or clinical psychologist rather than relying on these tools alone [1][2].

1. Move first, then focus. Copy the school study's order: a little physical movement before a focus session, to give restless premotor circuits an outlet [1][2].
2. Train visual focus in short bouts. Hold your gaze on a close target such as your hand for about 30 to 60 seconds, then on targets progressively farther across the room, for just a few minutes a day, paying attention to how often you blink [1][2].
3. Give the body a quiet outlet while you work. A subtle foot tap, a bounced knee or a fidget tool such as a rubber band on the desk can steady the rest of you; when speaking in public, pacing or gesturing does the same job [1][2].
4. Widen your gaze when you're missing things. Use panoramic vision, dilating your gaze to take in the ceiling, floor and walls while looking ahead, to engage the visual pathways that are better at processing events in time and catching multiple targets [1][2].
5. Try one 17-minute session. Sit quietly with your eyes closed, attend to your breathing and body sensations, and return when your mind drifts; Huberman describes a single session as reducing attentional blinks in a near-permanent way [1][2].
6. Put precise work early in the day. Huberman's view is that you are a higher-resolution camera early, when dopamine and norepinephrine dominate, so rule-bound work belongs then and brainstorming later [3].
7. Check your mood before creative work. If you are low or middling, spend about 5 to 30 minutes on something that lifts it, such as music you love, an inspiring story or exercise; if you are already up, start right away and limit extra stimulation [4].
8. Time caffeine to the task. Huberman avoids caffeine before divergent, idea-generating work and uses 1 to 3 milligrams per kilogram of body weight before convergent work [4].
9. Don't count on cannabis for focus. In the sources, long-term users blink far less and may focus while being unable to remember what they focused on, and high-THC cannabis can produce ideas that can't be pulled together or remembered later [1][4].
10. Protect sleep. Poor, short or fragmented sleep blurs the daily dopamine and serotonin phases that shape how finely you perceive time [3].

Sources

1. ADHD and How Anyone Can Improve Focus: Dopamine, Attentional Blinks and Practical Tools · Huberman Lab
2. Adhd How Anyone Can Improve Their Focus · Huberman Lab
3. Time Perception & Entrainment by Dopamine, Serotonin & Hormones · Huberman Lab
4. The Science of Creativity & How to Enhance Creative Innovation · Huberman Lab