Zap your brain into the zone

Sunday, March 4th, 2012

Transcranial direct current stimulation (tDCS) may induce a state of flow and put you “in the zone”:

In one groundbreaking study, [Mihaly Csikszentmihalyi] interviewed a few hundred talented people, including athletes, artists, chess players, rock climbers and surgeons, enabling him to pin down four key features that characterise flow.

The first is an intense and focused absorption that makes you lose all sense of time. The second is what is known as autotelicity, the sense that the activity you are engaged in is rewarding for its own sake. The third is finding the “sweet spot”, a feeling that your skills are perfectly matched to the task at hand, leaving you neither frustrated nor bored. And finally, flow is characterised by automaticity, the sense that “the piano is playing itself”, for example.

Exactly what happens in the brain during flow has been of particular interest, but it has been tricky to measure. Csikszentmihalyi took an early stab at it, using electroencephalography (EEG) to measure the brain waves of expert chess players during a game. He found that the most skilled players showed less activity in the prefrontal cortex, which is typically associated with higher cognitive processes such as working memory and verbalisation. That may seem counter-intuitive, but silencing self-critical thoughts might allow more automatic processes to take hold, which would in turn produce that effortless feeling of flow.

Later studies have confirmed these findings and revealed other neural signatures of flow. Chris Berka and her colleagues at Advanced Brain Monitoring in Carlsbad, California, for example, looked at the brain waves of Olympic archers and professional golfers. A few seconds before the archers fired off an arrow or the golfers hit the ball, the team spotted a small increase in what’s known as the alpha band, one of the frequencies that arises from the electrical noise of all the brain’s neurons (The International Journal of Sport and Society, vol 1, p 87). This surge in alpha waves, Berka says, is associated with reduced activation of the cortex, and is always more obvious in experts than in novices. “We think this represents focused attention on the target, while other sensory inputs are suppressed,” says Berka. She found that these mental changes are accompanied by slower breathing and a lower pulse rate — as you might expect from relaxed concentration.

Defining and characterising the flow state is all very well, but could a novice learn to turn off their critical faculties and focus their attention in this way, at will? If so, would it boost performance? Gabriele Wulf, a kinesiologist at the University of Nevada at Las Vegas, helped to answer this question in 1998, when she and her colleagues examined the way certain athletes move (Journal of Motor Behavior, vol 30, p 169).

At the time, she had no particular interest in the flow state. But Wulf and her colleagues found that they could quickly improve a person’s abilities by asking them to focus their attention on an external point away from their body. Aspiring skiers who were asked to do slalom-type movements on a simulator, for example, learned faster if they focused on a marked spot ahead of them. Golfers who focused on the swing of the club were about 20 per cent more accurate than those who focused on their own arms.

Wulf and her colleagues later found that an expert’s physical actions require fewer muscle movements than those of a beginner — as seen in the tight, spare motions of top-flight athletes. They also experience less mental strain, a lower heart rate and shallower breathing — all characteristics of the flow state (Human Movement Science, vol 29, p 440).

These findings were borne out in later studies of expert and novice swimmers. Novices who concentrated on an external focus — the water’s movement around their limbs — showed the same effortless grace as those with more experience, swimming faster and with a more efficient technique. Conversely, when the expert swimmers focused on their limbs, their performance declined (International Journal of Sport Science & Coaching, vol 6, p 99).

Wulf’s findings fit well with the idea that flow — and better learning — comes when you turn off conscious thought. “When you have an external focus, you achieve a more automatic type of control,” she says. “You don’t think about what you are doing, you just focus on the outcome.”

Berka has been taking a different approach to evoke the flow state — her group is training novice marksmen to use neurofeedback. Each person is hooked up to electrodes that tease out and display specific brain waves, along with a monitor that measures their heartbeat. By controlling their breathing and learning to deliberately manipulate the waveforms on the screen in front of them, the novices managed to produce the alpha waves characteristic of the flow state. This, in turn, helped them improve their accuracy at hitting the targets. In fact, the time it took to shoot like a pro fell by more than half (The International Journal of Sport and Society, vol 1, p 87).

But as I found when I tried the method, even neurofeedback has a catch. It takes time and effort to produce really thrumming alpha waves. Just when I thought I had achieved them, they evaporated and I lost my concentration. Might there be a faster way to force my brain into flow? The good news is that there, too, the answer appears to be yes.

That is why I’m now allowing Michael Weisend, who works at the Mind Research Network in Albuquerque, New Mexico, to hook my brain up to what’s essentially a 9-volt battery. He sticks the anode — the positive pole of the battery — to my temple, and the cathode to my left arm. “You’re going to feel a slight tingle,” he says, and warns me that if I remove an electrode and break the connection, the voltage passing through my brain will blind me for a good few seconds.

Weisend, who is working on a US Defense Advanced Research Projects Agency programme to accelerate learning, has been using this form of transcranial direct current stimulation (tDCS) to cut the time it takes to train snipers. From the electrodes, a 2-milliamp current will run through the part of my brain associated with object recognition — an important skill when visually combing a scene for assailants.

The mild electrical shock is meant to depolarise the neuronal membranes in the region, making the cells more excitable and responsive to inputs. Like many other neuroscientists working with tDCS, Weisend thinks this accelerates formation of new neural pathways during the time that someone practises a skill. The method he is using on me boosted the speed with which wannabe snipers could detect a threat by a factor of 2.3 (Experimental Brain Research, vol 213, p 9).

Mysteriously, however, these long-term changes also seem to be preceded by a feeling that emerges as soon as the current is switched on and is markedly similar to the flow state. “The number one thing I hear people say after tDCS is that time passed unduly fast,” says Weisend. Their movements also seem to become more automatic; they report calm, focused concentration — and their performance improves immediately.

It’s not yet clear why some forms of tDCS should bring about the flow state. After all, if tDCS were solely about writing new memories, it would be hard to explain the improvement that manifests itself as soon as the current begins to flow.

One possibility is that the electrodes somehow reduce activity in the prefrontal cortex — the area used in critical thought, which Csikszentmihalyi had found to be muted during flow. Roy Hamilton, a neuroscientist at the University of Pennsylvania in Philadelphia, thinks this may happen as a side effect of some forms of tDCS. “tDCS might have much more broad effects than we think it does,” he says. He points out that some neurons can mute the signals of other brain cells in their network, so it is possible that stimulating one area of the brain might reduce activity in another.


  1. Ross says:

    …serious meditators down-ramp prefrontal activity (both in amplitude and frequency range, if memory serves…).

    Probably not too many studies training multi-decade meditators as snipers, though.

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