B-Trainer · attention and timing training

A body that rushes,
a brain that waits
— tuned to one clock

B-Trainer is a timing training system. You predict a beat that comes as a sound or a light, and tap it with your hands and feet. Every tap is measured to 1/1000 of a second.

See the research
1/1000 s
measurement precision
Hands · feet
left and right measured separately
12 sessions
personalized training plan
B-Trainer · rhythm motor training

Hands and feet
back in time,
beat by beat

A hand-and-foot timing practice used alongside professional rehabilitation. Differences between left and right, and between hands and feet, are recorded to 1/1000 of a second.

See the research
Left / right
differences compared
Hands · feet
measured separately
Online
reports
B-Trainer · sports timing training

See it, hear it,
move on the beat

Bringing what you see and hear together with your movement within a single beat. Recorded to 1/1000 of a second and compared over time.

See the research
1/1000 s
precision
L / R · hands · feet
coordination
Online
reports
Who it’s for

Who is it for?

Timing training that predicts the beat can be used across ages and goals.

ADHD · attention
When attention drifts easily
People whose attention drifts quickly and whose body moves before the signal practice waiting for the beat and meeting it. We show, in milliseconds, how much they rush and how much they wobble.
BrainWaiting for a beat and meeting it is known to involve the cerebellum and the basal ganglia, which keep time.
MeasuredRushing · variability · holding back (inhibition)
Tics · self-regulation
Moving exactly when you mean to
Tics are sudden movements or sounds that come against one’s will. Here we practice the opposite: moving the hands and feet only as much as intended, exactly when the beat arrives, while seeing one’s own timing in numbers.
BrainMoving at a chosen moment uses brain circuits that select and start movements, together with the cerebellum that keeps time.
MeasuredRushing · left–right and hand–foot balance · holding back
Attention · cognition
Holding focus for longer
People who need long focus for study or work practice holding the beat to the very end. We see how the variability changes toward the end of a task.
BrainSustained focus relies on the front of the brain (frontal lobe), with the cerebellum helping to keep time.
MeasuredLate-task variability · recovery after a slip
Rehabilitation · coordination
Relearning the timing of hands and feet
People relearning to use their hands and feet, for example after a stroke, can practice predicting the beat alongside professional rehabilitation. Left–right differences are recorded as numbers.
BrainIn the brain’s body map, hands and feet, left and right, are handled by different areas — so each limb is measured separately.
MeasuredLeft–right difference · hand–foot difference
Sports · performance
Bringing the senses and movement together
Athletes bring what they see and hear together with their movement within a single beat. Timing and coordination are recorded so they can be compared over time.
BrainPrecise timing needs what you see and hear to meet your movement within one beat.
MeasuredTiming · left–right · hand–foot coordination
Seniors · mild cognitive impairment
Using mind and body together
People who feel their memory and attention are not what they used to be, such as with mild cognitive impairment (MCI), practice moving their hands and feet to a predicted beat of sound or light.
BrainAnswering a sound or a light with the hands and feet uses the seeing and hearing brain together with the moving brain.
MeasuredTiming · consistency
Why rhythm

Keeping a beat uses many parts of the brain at once

Waiting for a signal, judging time and moving at the chosen moment. This short act calls on attention, control and movement all together.

Waiting
Not moving too soon
Holding back the urge to move before the signal, and keeping attention until the end.
Front of the brain (frontal lobe)
Timing
Judging less than a second
Matching times shorter than a second has been reported to rely more on the cerebellum and the basal ganglia.
Cerebellum · basal ganglia
Moving
The right amount at the right moment
Turning what you see and hear into movement of the hands and feet. Hands and feet, left and right, are handled by different areas of the brain.
Left and right hemispheres · corpus callosum
Key research
  • 319
    A meta-analysis of 319 studies reported that children and adolescents with ADHD have more variable reaction times than their peers.
    Kofler et al. (2013) · Clinical Psychology Review
  • 41
    A meta-analysis of 41 brain-imaging studies reported that timing intervals shorter than a second relies more on the basal ganglia and the cerebellum.
    Wiener et al. (2010) · NeuroImage
  • 22
    A meta-analysis of 22 studies (1,734 children) reported that children who received music training performed better on inhibitory control tasks.
    Jamey et al. (2024) · Cognition
  • 11 m
    A Cochrane review of clinical trials reported that walking to a steady beat after a stroke increased walking speed by about 11 m per minute.
    Magee et al. (2017) · Cochrane Database of Systematic Reviews

These studies report on timing, movement and attention. B-Trainer was developed based on related papers and research. More research →

How it works

Measure, train, measure again

The first measurement is the starting point. We see which hand or foot, with which signal, wobbles how much — and set each day’s training from that.

STEP 1
Precise measurement
Clapping, both hands and both feet are measured with sound signals and with visual signals, in milliseconds. Rhythm keeping (continuing without a signal) and inhibition (holding back on the beats you must skip) are measured separately.
STEP 2
A plan built on the measurement
A personalized 12-session plan is built from the limbs, tempo and difficulty the measurement revealed.
STEP 3
Step-by-step difficulty
When it goes well the level goes up; when it is hard it goes down — so training stays neither too easy nor too hard.
STEP 4
Check by measuring again
Measure again and compare the change in numbers. An AI report explains the results in everyday language.
Inhibition
The power to stop
While tapping the beat, you skip only the beats marked with an X. Stopping practice is added to the limb that jumps ahead most often.
Rhythm keeping
The power to carry on alone
At the end of a task all signals switch off and you keep the beat going on your own — showing whether the training has stayed with you.
Web reports

Every tap, in a report

Results are saved to the server and viewed on the web — on a PC or on a phone.

Measurement report
Compared with peers of the same age, by limb and by signal (sound or visual).
Training report
How timing changed from session to session, task by task.
AI report
The numbers explained in everyday language, with suggestions to try at home.
Shared with family and centres
Guardians and trainers can see the same records from wherever they are.
What the records show

We looked at 18 years of training records

From the records of about 28,000 people who have trained with B-Trainer and its predecessor products since 2008, we summarized how beat errors changed with training.

12 sessions 15% · 60 sessions 33%
Beat errors went down with training
Compared with the first three sessions, errors were on average 15% lower at the 12th session and 33% lower at the 60th. The decline had not stopped by the 60th session.
First100
12th85
24th78
36th73
60th67
The count is what matters
Once or five times a week — similar change by session 12
The reduction at the 12th session was 10–15% however many days a week people trained. What mattered was the total number of sessions; training more often simply got there sooner.
Days to reach 12 sessions
5 days/wk16 days
3 days/wk29 days
2 days/wk43 days
1 day/wk101 days
Clear from age 7
The pace differs with age
The reduction over 12 sessions was clear from age 7, while children aged 4–6 changed more slowly. The younger the child, the longer and steadier the view should be.
4–6 yrs6%
7–9 yrs14%
10–12 yrs17%
13–19 yrs18%
20–39 yrs21%
Twice as fast without breaks
Those who kept going saw more change
Among about 7,000 people who reached 24 sessions, those who never took a break longer than two weeks reduced beat errors by 21%, versus 17% for those who did — and reached 24 sessions in 83 days instead of 178. Even after a break, 8 in 10 regained their earlier level within 3 sessions.
Reduction at session 24
No break21%
2+ wk break17%
Days to reach 24 sessions
No break83 days
2+ wk break178 days

These are real training records accumulated by B-Trainer (one day of training = one session). Values are medians of beat error (ms) in sessions completed at tempo 60, adjusted for movement difficulty. As there is no comparison group, the change also includes getting used to the task as well as growth.

Our history
  • 2008
    First training records with B-Trainer’s predecessor program.
  • 2010
    Q-Trainer and NeuroSync servers built from scratch — they kept training records for 16 years.
  • 2013
    Q-Trainer upgraded. A Korean study that measured responses with the predecessor program was published (Park et al., 2013).
  • 2014
    Renamed B-Trainer.
  • 2017–2019
    Exported to Russia in three rounds.
  • 2023
    Development of the current, new B-Trainer began.
  • 2026
    New B-Trainer released: 1/1000-second measurement, personalized plans, web reports, inhibition and rhythm keeping.
FAQ

Frequently asked questions

What is B-Trainer?
A timing training system in which you predict a beat that comes as a sound or on a screen, and tap the device pads with your hands and feet at that moment. It is not a reaction-speed drill — it is practice in meeting the beat precisely.
What is measured, and how?
For every tap, the device measures how many milliseconds (1/1000 s) it was ahead of or behind the beat. Results are broken down by hand and foot, left and right, and sound and visual signals, and shown as a score compared with peers of the same age.
How does training work after the measurement?
The measurement produces a personalized 12-session plan. Each session has 6–7 tasks and takes about 30 minutes, with set tasks and tempo. About four weeks later you measure again to see what has changed.
Are there tasks other than keeping the beat?
Yes. Inhibition tasks ask you to hold back when an X appears between beats, and rhythm keeping asks you to continue the beat after the signals stop.
From what age can it be used?
From childhood to adulthood. Age-appropriate reference values and training rules are built in. In 18 years of records, the reduction in beat error over 12 sessions averaged 6% for ages 4–6, 14% for 7–9, 17% for 10–12, 18% for 13–19 and 21% for 20–39.
How often should we train?
One session a day, about 30 minutes. In our records, the total number of sessions mattered more than how often — training more often simply reached the same change sooner.
Can children with ADHD use it?
Yes. Each tap is recorded as milliseconds ahead of or behind the beat, so you can see in numbers whether a child is rushing, lagging or wobbling. There is also an inhibition task. B-Trainer was developed based on related papers and research on timing and ADHD.
What equipment is needed?
The B-Trainer device with hand and foot pads, connected to a Windows PC or an Android tablet. Reports are viewed on the web.
Is B-Trainer available in my country?
Please contact us at info@btrainer.co.kr. We work with partner centres and distributors, and we are happy to talk about purchase, partnership or a demo.
Interested in B-Trainer?
We welcome inquiries about purchase, partnership and demos.