Sport · 4 min read
EEG in Sport: What It Can Really Measure in Athletes
EEG can now reveal differences in brain activity between expert and novice athletes, especially in precision skills, and neurofeedback has a moderate positive effect on some sport tasks [2] [3]. Dynamic sports remain harder to study because of motion artefacts [2].
What EEG measures, and what it does not
Electroencephalography records the brain's electrical activity at the surface of the scalp. It is most often analysed by frequency band, such as theta, alpha or beta, whose power varies with attention, mental workload, fatigue or the preparation of a movement.
EEG does not read thoughts, and it does not directly measure notions such as confidence or flow. It provides clues about brain states, which have to be interpreted in the context of the task.
Experts and novices: what the research has shown
A 2016 review presents brain oscillations as promising candidates for biomarkers of sports performance [1]. The wording matters: these are still research directions, not ready-to-use indicators.
A 2019 review confirms that differences in brain activity between experts and novices have been observed, especially in precision skills [2]. It also highlights the main limitation: motion artefacts still pose many challenges as soon as the athlete moves [2].
Neurofeedback: a real effect that needs a framework
Neurofeedback shows athletes a live indicator of their brain activity so that they can learn to modulate it. A 2025 meta-analysis of 21 studies found a moderate positive effect on sport motor tasks (g = 0.78) [3].
A review of 13 randomised controlled trials reports improvements, notably in shooting and putting, but also a lack of standardisation: methods and targeted brain regions vary widely from one study to another [4]. The results are encouraging, but no single protocol is an accepted reference today.
The "quiet eye": a measure of gaze
The quiet eye is the final fixation of the gaze before a movement is executed, such as a shot or a putt. A meta-analysis of 27 studies shows that it is longer in experts than in novices, and longer on successful attempts than on missed ones [5].
It is frequently cited in articles about the athlete's brain, but it is an ocular measure, obtained through eye tracking. It describes visual strategy, not brain activity directly.
The challenge of sports in motion
Most of the robust findings concern slow movements performed with the head still: shooting, golf, putting. In dynamic sports, running, impacts, changes of direction and sweat heavily disrupt the signal [2].
What holds for a stationary shooter cannot simply be transferred to a footballer or a cyclist in full effort. That is the main barrier for EEG in sport: obtaining a usable signal during movement.
What can reasonably be expected
- Tracking states such as mental workload and mental fatigue, which do not show in physical indicators.
- Comparing athletes with themselves over time, rather than with a general norm.
- Using neurofeedback as one training tool among others, with a clear protocol.
- Staying cautious about promises: EEG does not measure talent, nor flow.
SPARK SPORT is designed in that spirit: a core engineered for movement, vibration and heat, which measures focus, composure and mental fatigue in real sessions, and tells them apart from physical fatigue.
Questions
Can EEG improve sports performance?
EEG is first and foremost a measurement tool. Used for neurofeedback, it showed a moderate positive effect on sport motor tasks in a meta-analysis of 21 studies, particularly for precision skills.
Does neurofeedback really work?
Controlled trials show improvements, for example in shooting and putting. Protocols remain poorly standardised, however, which makes results hard to compare and to generalise.
What is the quiet eye?
It is the final fixation of the gaze before a movement. It is longer in experts and on successful attempts. It is a measure of gaze, not a measure of brain activity.
Can flow be measured with EEG?
No solid source currently supports the claim that EEG measures flow. It provides information on states such as attention, mental workload or fatigue, which must be interpreted with caution.
Can you wear an EEG during exercise?
It is possible, but movement, impacts and sweat heavily disrupt the signal. Most robust findings involve slow movements with the head kept still.
Sources
Numbers in brackets in the text refer to these sources.
- Cheron et al. (2016). Brain Oscillations in Sport: Toward EEG Biomarkers of Performance. Frontiers in Psychology.doi.org
- Tan et al. (2019). A Brief Review of the Application of Neuroergonomics in Skilled Cognition During Expert Sports Performance. Frontiers in Human Neuroscience.doi.org
- Yu et al. (2025). The Effect of EEG Neurofeedback Training on Sport Performance: A Systematic Review and Meta-Analysis. Scandinavian Journal of Medicine & Science in Sports.doi.org
- Cheng et al. (2024). Evaluating EEG neurofeedback in sport psychology: a systematic review of RCT studies. Frontiers in Psychology.doi.org
- Lebeau et al. (2016). Quiet Eye and Performance in Sport: A Meta-Analysis. Journal of Sport and Exercise Psychology.doi.org