A Way to Amplify (or Weaken) the Effect of Self-Talk on Performance

It’s been a couple years now since our dog was a puppy, but I still remember when he was afraid to go down stairs.

He’d sort of peer down the steps and scamper nervously from side to side a bit, and eventually plant his butt firmly on the ground and resist taking the next step.

So we’d cajole and encourage him, saying “C’mon DJ! You can do it!” And eventually, one day, he did make it down the stairs.

Of course, this sort of encouragement is not unique to puppies. We do this with our kids, our students, our friends, our colleagues. But perhaps more importantly, we also do this for ourselves.

Because when things are a little uncertain, it’s common to try to building up our confidence and courage with a little internal pep talk. And studies on self-talk suggest that this can indeed facilitate greater learning, accuracy in certain motor skills, and even strength and endurance.

But sometimes, self-talk doesn’t seem to work, and instead, we feel doubts creeping in. Where saying “I got this” is met by another voice that says “No you don’t. You’re totally going to screw this up.”

So is there a way to get our words to sink in better, quiet those fears and doubts, and help us perform up to our abilities in these moments?

Well, a recent study suggests that it may not just be our words that matter, but our physical motions as well.


Reinforcing or undermining self-talk

You know how talking to some people is like talking to a wall? Where they’re so expressionless, and give you so little feedback, that you have no idea what they’re thinking?

Whereas most folks smile or nod along, and in so doing, make you feel supported and validated in whatever you’re saying?

There is research which suggests that the same thing might be true with self-talk as well. Where nodding reinforces the validity of the thoughts in our head, while shaking our head “no” undermines whatever we might be thinking.

I know that sounds sort of weird, but let’s take a closer look.

Positive or negative self-statements

A team of researchers (Horcajo, Paredes, Higuero, Briñol, & Petty, 2019) recruited 150 CrossFit athletes to participate in a study purportedly about the use of headphones at the gym.

Everyone was randomly assigned to either a positive self-statement group or a negative self-statement group, and asked to write down and record themselves saying either 3 positive things about their current state of physical fitness, or 3 negative things about their current state of fitness.

Things like: “I have trained very hard every day,” “I have increased my resistance,” or “I’m in really good physical condition.” (positive)

Or: “I’ve been missing some workouts lately,” “I feel more tired than usual,” or “I get injured way too often.” (negative)

Nodding or shaking

They were then given a set of headphones, which they were told were being tested for “sound quality, comfort, and so on” while engaged in certain movements. To test them, half of the participants were asked to move their heads up and down while listening to their self-statements – so as to get the athletes to act as if they were nodding, but without telling them explicitly to nod.

The other half of the participants were asked to move their heads side to side while listening to their recorded self-statements (like shaking their heads “no”).

Then came a few physical tests.

Physical tests

First up was a vertical jump test, to see how high they could jump.1

Then they did a squat test (30 squats in 45 seconds) to gauge cardiorespiratory performance.2

Finally, there was a deadlift test, where athletes were given 4 lifts, at various weights they selected, enabling researchers to calculate an estimate of their 1-rep maximum.3

So what kind of effect did self-talk and all this nodding or shaking have on performance?


Vertical jump

Overall, the positive self-talk group performed better than the negative self-talk group – 31.09cm vs. 27.70cm.

But what all the nodding? Did that have an effect on self-talk?

Well, the positive nodding group averaged 33.15cm, performing significantly better than the negative nodding group, which averaged 26.15cm. So physically affirming either positive or negative self-talk did seem to amplify its effect on performance – in both a positive or a negative direction.

Meanwhile, as predicted, there was no significant difference between the head shaking groups, where the positive shaking group averaged 28.96cm, and the negative shaking group averaged 29.21cm. Essentially suggesting that shaking their heads had the effect of weakening whatever effect positive or negative self-talk may otherwise have had.


Likewise with the squat test, the positive nodding group scored 4.64 (lower scores is better), while the negative nodding group scored 5.75 (a statistically significant difference).

And once again, there was no statistically significant difference in performance between the shaking groups, with the positive group scoring 5.53, while the negative group scored 5.10.


And finally, with the deadlift, it was more of the same.

The positive self-talk group had a substantially greater estimated 1-rep max than the negative self-talk group – 159.86kg vs. 133.12kg. And the positive nodding group had a 1RM of 175.23kg, while the negative nodding group had a 1RM of 122.31kg.

Meanwhile, there was no difference in performance between the positive and negative shaking groups – 144.08kg vs. 143.62kg.

So what does this all mean?


The main takeaway is that it seems our body movements can potentially amplify the effect of whatever we’re saying to ourselves.

So nodding along in apparent agreement, could make positive self-talk even more performance-enhancing. And nodding along to negative self-talk makes the negativity even more detrimental to performance.

Meanwhile, shaking our head seems to invalidate or neutralize whatever we might be saying to ourselves. Which is pretty intriguing, because it suggests that saying something negative like “I should have practiced more” while shaking your head, for instance, might lead to a better performances than if you were to say the very same thing while nodding.


Of course, you have to take all this with a grain of salt, because the study looked at feats of strength (Festivus reference intended!) and cardio, as opposed to fine-motor control and accuracy.

And the authors acknowledge that it’d be interesting to see what might happen if the nodding or shaking was done on purpose, instead of through the ruse of testing headphone comfort (although I do feel like it was kind of transparent).

Still, this seems like an intriguing thing to experiment with. But how would that work, exactly?

Take action

Well, there are two ways you could try this out.

Whether it’s a studio class, final exam, first date, or plank challenge day at the gym, the next time you engage in positive self-talk or a mantra like “I’m excited” or “I got this,” try nodding along as you say this to yourself, and see if it changes your experience (and quality of performance) in the moment.

Or, if you find yourself stuck in negative self-talk loop before something important, and are having trouble getting out of it, you could at least try shaking your head, to see if this helps to blunt the impact of these statements.

Until you are able to get yourself into a more positive headspace of course, at which point you can try nodding again.

I know, this all sounds a little goofy, but in a way, that kind of makes me all the more intrigued. If you try it, let me know how it works out!


Horcajo, J., Paredes, B., Higuero, G., Briñol, P., & Petty, R. E. (2019). The Effects of Overt Head Movements on Physical Performance After Positive Versus Negative Self-Talk. Journal of Sport and Exercise Psychology, 1–10.


  1. They used the My Jump 2 app, which I have to admit looks pretty cool…
  2. This starts of with a heart rate measurement, then involves 30 squats in 45 seconds to the beat of a metronome, and is followed by another measurement of one’s pulse, then a 1-min rest, and one last HR measurement. All of which gets plugged into the formula [(P1 – 70) + (P2 P0)] / 10 that gives you a “Ruffier-Dickson index” score where lower scores = better cardiorespiratory performance.
  3. They used the My Lift app, which estimates your 1-rep max based on the speed at which you can lift lighter weights. This app sounds pretty cool too, no?

Ack! After Countless Hours of Practice...
Why Are Performances Still So Hit or Miss?

For most of my life, I assumed that I wasn’t practicing enough. And that eventually, with time and performance experience, the nerves would just go away.

But in the same way that “practice, practice, practice” wasn’t the answer, “perform, perform, perform” wasn’t the answer either. In fact, simply performing more, without the tools to facilitate more positive performance experiences, just led to more negative performance experiences!

Eventually, I discovered that elite athletes are successful in shrinking this gap between practice and performance, because their training looks fundamentally different. In that it includes specialized mental and physical practice strategies that are oriented around the retrieval of skills under pressure.

It was a very different approach to practice, that not only made performing a more positive experience, but practicing a more enjoyable experience too (which I certainly didn’t expect!).

If you’ve been wanting to perform more consistently and get more out of your daily practice, I’d love to share these research-based skills and strategies that can help you beat nerves and play more like yourself when it counts.

Click below to learn more about Beyond Practicing, and start enjoying more satisfying practice days that also transfer to the stage.


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