For a long time, mental training carried a faint whiff of the unserious. Visualization was the thing the sports psychologist had you do when there was nothing left to actually work on, a relaxation exercise dressed up in athletic language. Close your eyes, see the strike, feel good about it. Useful, maybe, in the way a pep talk is useful, but not real training in the sense that throwing a bullpen is real training. A 2026 study in Experimental Brain Research takes that assumption and quietly dismantles it, because it turns out that when a pitcher imagines throwing, the brain does not treat it as daydreaming. It treats it as pitching.

What the Study Found

Nakazawa and colleagues used transcranial magnetic stimulation, which lets researchers measure how excitable the motor pathways to a given muscle are at a given moment, and they aimed it at the brains of participants imagining baseball pitching. They recorded from a handful of upper-limb muscles, including the wrist flexors and the abductor pollicis brevis, which is the small muscle that moves the thumb. The question was simple but not trivial: when you only imagine the throw, does the brain light up the same machinery it would use to actually execute it?

It does. Motor imagery of pitching, with no movement at all, significantly raised corticospinal excitability in the pitching-relevant muscles compared to rest. The pathways that drive the throw were primed and ready, fired by imagination alone. And when the researchers added a model video for participants to watch and imagine along with, the effect grew, with the wrist flexors increasing activation by 52% and the thumb muscle by 31%. Giving the brain a visual reference did not make the imagery more pleasant, it made it more neurally potent.

The detail that elevates this from interesting to genuinely useful is the specificity. The brain did not just generally rev up the arm. Pitching imagery recruited a different muscle pattern than imagining tennis, volleyball, basketball, or soccer, and the activation mirrored the actual functional role each muscle plays in a real delivery. The thumb muscle in particular showed significant activation during pitching imagery but stayed quiet during the imagery of those other sports. To be honest, this reminds me of how a skilled musician's fingers will twitch toward the correct frets while they listen to a piece they know, not toward random ones. The nervous system is not running a generic highlight reel. It is rehearsing this specific skill, down to the contribution of individual muscles.

Why This Information Is Important

The first reason this matters is that it retires the pseudoscience objection. We are not talking about a vague sense of confidence or a placebo. We are talking about measurable electrical facilitation of the exact motor pathways used to throw a baseball, produced by thought. That is a physiological event, and once you accept that imagery is neural activation rather than neural decoration, the whole category of mental training has to be taken more seriously.

It is not the only line of evidence pointing this way. A 2025 study by Su and colleagues took a different mental-domain intervention, heart rate variability biofeedback, and found that it did not just calm players down, it moved the needle on the field. Cognitive anxiety dropped, and batting scores roughly doubled, with measurable increases in bat speed and peak hand speed. Different mechanism than imagery, autonomic rather than corticospinal, but the same lesson rhymes through both: work done in the mental domain produces real, measurable changes in physiology and performance. The brain is not separate from the throw. It is the throw's origin.

But here is where I want to slow down, because the same finding that makes imagery powerful also makes it dangerous, and the cheerleading version of this story misses it. If imagining the throw activates the pathways for the throw, then imagining the wrong throw activates the pathways for the wrong throw. A 2023 study by Aoyama and colleagues looked at pitchers with the throwing yips and found something revealing. Their general imagery ability was fine. What set them apart was the vividness of their negative, throwing-specific imagery, the wild throw rendered in high definition. And critically, simply layering positive imagery on top of those unresolved negative scripts did not fix it. If you take the Experimental Brain Research finding seriously, this is exactly what you would predict. A vivid mental rehearsal of the throw sailing to the backstop is not harmless positivity gone missing, it is the nervous system rehearsing failure.

The Gray and colleagues study from 2017 sharpens the point from another angle. When pitchers were told which zone to avoid and then asked to perform under pressure, they hit that forbidden zone significantly more often, with their misses clustering toward exactly the spot they were trying not to throw. Telling the brain what not to do hands it a clear mental image of doing it, and under pressure that image leaks into the motor output. The mind's representation of the movement shapes the movement, for better and for worse. So the takeaway is not simply "imagery is good." It is that imagery is a loaded tool, and what you load into it matters as much as whether you use it at all.

How Can This Information Be Applied

The practical upside is real and immediate. If you can activate the motor pathways without physical execution, you can train in contexts where throwing is impossible or unwise. Recovery days, long travel stretches, the hours before a start, and especially the slumps where a pitcher needs to refine a mechanical change but should not be pounding the arm to do it. Deliberate kinesthetic imagery, feeling the movement rather than just watching it from the outside, becomes a legitimate rep that costs the elbow nothing. And given the video finding, pairing that imagery with a model clip of a clean delivery looks like a way to amplify the neural engagement rather than leaving it to chance.

The flip side is that you have to audit the content of the imagery, not just prescribe more of it. For an athlete fighting the yips or sitting in a confidence hole, the instruction to "just visualize success" can be worse than useless if vivid negative scripts are running underneath, because those scripts are themselves neural training. The work there is to identify and intervene on the negative imagery directly, not to paper over it. And in high-pressure moments, the reinvestment research is a warning against over-coaching the conscious mind into a list of things not to do, which is a fast route to doing precisely those things.

Then there is the thumb, which I cannot stop thinking about. The study found pitching-specific activation in a thumb muscle, and thumb musculature almost never shows up in our biomechanical conversations. Is that a dead end or a clue? Your database offers a hint that it might be a clue. Yeh and colleagues, using a sensor-embedded baseball with 21 pitchers, the same sample size as this imagery study, found that pinch strength, middle finger force, rate of force development in the fingers, and even finger length discrepancy all correlated with spin rate and velocity. And Wong and colleagues found that crush grip strength, the gross squeeze we usually test, had no relationship with spin, while pinch strength involving the deeper flexors was tied to spin efficiency. Notice what those two studies are circling. It is not the big, obvious grip that distinguishes pitchers, it is the fine, distal control of the fingers and the thumb, the very thing the brain selectively rehearsed during pitching imagery. The nervous system seems to know the thumb matters. Maybe our research should start asking why.

Conclusion

The cleanest way I can put it is this. At the level of the motor pathways, your brain does not draw a sharp line between imagining a pitch and throwing one. That single fact pulls in two directions at once, and both are worth holding. On one side, it means imagery is a real training stimulus you can use when the arm needs rest, especially when you feel the movement and give it a clean visual model to follow. On the other, it means the content of what you rehearse in your head is itself neural training, so the vivid replay of the wild throw is not a harmless worry, it is a rep you did not mean to take. Use imagery deliberately, mind what you load into it, and pay attention to the small signals the nervous system is sending. It activated the thumb for a reason. We just have not figured out the reason yet.

References

Nakazawa K, et al. Pitching-specific facilitation of upper-limb corticospinal excitability during motor imagery of sports motor skills. Experimental Brain Research. 2026;244(2):29.

Aoyama T, Ae K, Soma H, et al. Motor imagery ability in baseball players with throwing yips. PLOS One. 2023.

Gray R, Orn A, Woodman T. Ironic and Reinvestment Effects in Baseball Pitching: How Information About an Opponent Can Influence Performance Under Pressure. Journal of Sport and Exercise Psychology. 2017.

Su YT, Huang PH, Hsiao TC. The Impact of Heart Rate Variability Biofeedback on Anxiety Reduction and Batting Performance Enhancement in Taiwan University Baseball Players. Journal of Functional Morphology and Kinesiology. 2025.

Yeh MC, Yang WW, Hung YH, et al. Using a Sensor-Embedded Baseball to Identify Finger Characteristics Related to Spin Rate and Pitching Velocity in Pitchers. 2024.

Wong R, Laudner K, Evans D, Miller L. Relationships Between Clinically Measured Upper-Extremity Physical Characteristics and Ball Spin Rate in Professional Baseball Pitchers. Journal of Strength and Conditioning Research. 2021.