Huberman Lab - Essentials: How to Learn Skills Faster
Episode Date: March 27, 2025In this Huberman Lab Essentials episode, I explore how to improve motor skill learning and proficiency—whether for athletic performance, learning an instrument or refining any physical skill. I exp...lain practical tools to build skills, including how to structure learning sessions to focus on repetitions, use internal feedback systems and learn from errors—key elements for accelerating progress. I also discuss strategies such as visualization, metronoming, idle time and the impact of supplements like alpha-GPC and caffeine on performance. This episode provides valuable insights for anyone looking to accelerate and optimize their motor skill development. Huberman Lab Essentials are short episodes (approximately 30 minutes) focused on essential science and protocol takeaways from past Huberman Lab episodes. Essentials will be released every Thursday, and our full-length episodes will still be released every Monday. Read the episode show notes at hubermanlab.com. Thank you to our sponsors AG1: https://drinkag1.com/huberman LMNT: https://drinklmnt.com/lmnt Mateina: https://drinkmateina.com/huberman Timestamps 00:00:00 Huberman Lab Essentials; Learning Motor Skills 00:01:10 Building New Skills, Tools: Open vs Closed Loop; Focus 00:03:58 Sponsor: LMNT 00:05:15 Skills & Realistic Expectations, Super Mario Effect 00:09:34 Tube Test & Brain, Tool: Increase Repetitions 00:12:19 Importance of Errors, Framing Effect, Neuroplasticity 00:14:39 Sponsor: AG1 00:15:43 Learning Session Protocol, Tool: Idle Time Post-Learning 00:19:44 Movement Speed, Ultra-Slow Movements 00:21:49 Skill Proficiency & Errors, Tool: Metronoming 00:24:16 Sponsor: Mateina 00:25:42 Mental Rehearsal & Limits, Tool: Visualization 00:28:24 Skill Learning & Supplements, Alpha-GPC, Caffeine 00:32:14 Recap & Key Takeaways Disclaimer & Disclosures
Transcript
Discussion (0)
Welcome to Huberman Lab Essentials,
where we revisit past episodes
for the most potent and actionable science-based tools
for mental health, physical health, and performance.
I'm Andrew Huberman, and I'm a professor of neurobiology
and ophthalmology at Stanford School of Medicine.
This podcast is separate from my teaching
and research roles at Stanford.
It is, however, part of my desire and effort
to bring zero cost to consumer information about science
and science related tools to the general public.
Today, we're going to talk about and focus on skill learning.
We are going to focus on how to learn skills more quickly,
in particular motor skills.
So if you're interested in how to perform better,
whether or not it's dance or yoga,
or even something that's just very repetitive
like running or swimming,
this podcast episode is for you.
We're going to go deep into the science of skill learning
and we are going to talk about very specific protocols
that the science points to and has verified,
allow you to learn more quickly, to embed that learning
so that you remember it
and to be able to build up skills more quickly
than you would otherwise.
Let's talk about the acquisition of new skills.
These could be skills such as a golf swing
or a tennis swing,
or you're shooting free throws
or you're learning to dance
or you're learning an instrument.
I'm mainly going to focus on athletic performance.
There are basically two types of skills,
open loop and closed loop.
Open loop skills are skills where you perform
some sort of motor action and then you wait
and you get immediate feedback
as to whether or not it was done correctly or not.
A good example will be throwing darts at a dartboard.
So if you throw the dart,
you get feedback about whether or not you hit the bullseye,
that's open loop.
Closed loop would be something that's more continuous.
So let's say you're a runner
and you're starting to do some speed work and some sprints
and you're running and you can kind of feel whether or not you're a runner and you're starting to do some speed work and some sprints and you're running
and you can kind of feel whether or not
you're running correctly or maybe even have a coach
and they're correcting your stride.
That's closed loop because as you go,
you can adjust your behavior
and you can adjust the distance of your steps
or you can adjust your speed or you can adjust your posture.
You're getting feedback on a moment to moment basis.
There are essentially three components of any skill
that involves motor movement.
And those are sensory perception,
actually perceiving what you are doing
and what's happening around you.
Then there are the actual movements.
And then there's something called proprioception.
And proprioception is often discussed as kind of a sixth
sense of knowing where your limbs are in relation
to your body.
Now, skill learning has a lot of other dimensions too,
but those are the main ones that we're going to focus on.
So anytime we learn something, we have to decide
is it open loop or closed loop?
The second question should be,
what should I focus my attention on?
Auditory attention, visual attention, or proprioception?
Should I focus on where my limbs are relative to my body
or should I focus on the outcome?
Okay, this is a critical distinction.
You can decide to learn how to do a golf swing
or a dance tango and decide that you are going to focus
on the movements of your partner
or the positions of your feet,
or maybe you're going to sense the position
and posture of your body, which is more proprioceptive.
Okay, so you have to allocate your attention
and I'm going to tell you how to allocate your attention best
in order to learn faster.
So these are the sorts of decisions that you have to make.
So we can really simplify things now.
I've given you a lot of information,
but we can simplify it.
Basically open loop or closed loop, that's one question.
And what am I going to focus on?
And then your neurology will take care of the rest.
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So now I want to talk about realistic expectations.
Somewhere in Hollywood, presumably,
it got embedded in somebody's mind
that instant skill acquisition was possible,
that you could take a particular pill
and you would suddenly have a skill.
And I love movies, but it simply doesn't exist.
Then the self-help literature created another rule
called the 10,000 hours rule.
And frankly, that doesn't really match the literature,
at least the scientific literature either.
I like it because it implies that learning takes time,
but the 10,000 hours rule overlooks something crucial,
which is that it's not about hours, it's about repetitions.
Now, of course, it's about repetitions.
Now, of course, there's a relationship between time and repetitions,
but there are some beautiful experiments
that point to the fact that by simple adjustment
of what you are focused on as you attempt
to learn a new skill,
you can adjust the number of repetitions that you do,
you adjust your motivation for learning
and you can vastly accelerate learning.
Some of you may recognize this by its internet name,
which is not a scientific term,
which is the Super Mario effect.
The Super Mario effect relates
to the game Super Mario Brothers,
but you'll see why at the end.
But basically what they did was they had 50,000 subjects,
which is a enormous number of subjects,
learn a program, essentially taking words
from a computer program or the commands
for a computer program that were kind of clustered
in a column on the right.
And those commands are essentially,
they essentially translate to things like, you know,
go forward and then if it's a right-hand turn in the maze,
then go right and continue until you hit a choice point,
et cetera.
So it's a bunch of instructions,
but the job of the subjects in these experiments
were to organize those instructions in a particular way
that would allow a little cursor
to move through the maze successfully.
It takes some skill.
You have to know what commands to give
in what particular order.
And they made that very easy.
You could just assemble them in a list
over onto the right.
Now, there were two groups and some,
one half of the subjects, if they got it wrong,
meaning they entered a command and the cursor would move
and it was the wrong command for this little cursor
to move through the maze,
they saw a signal jump up on their screen that said,
that did not work, please try again.
The subjects would reorganize the instructions
and then the little cursor would continue. And if they got it wrong again, it would say that did not work, please try again. The subjects would reorganize the instructions and then the little cursor would continue.
And if they got it wrong again,
it would say that did not work, please try again.
Okay, the other half of the subjects,
if they got something wrong,
we're told you just lost five points, please continue.
So that's the only difference in the feedback that they got.
Now, I have to confess, I would have predicted
based on my knowledge of dopamine circuitry
and reward contingency, people will work much harder
to prevent losing something
than they will to gain something.
And it turns out that that's not at all what happened.
If they looked at the success rate of the subjects,
what they found was that the subjects that were told
that did not work, please try again,
had a 68% success rate.
68% of them went on to successfully program this cursor
moving through the maze.
Whereas the ones that were told you lost five points
had a 52% success rate, which is a significant difference.
But the source of the success or the lack of success
is really interesting.
The subjects that were told that did not work,
please try again, tried many, many more times
per unit time.
In other words, they made more attempts
at programming this thing to allow this cursor
to move through the maze.
Whereas the people that were told you lost five points
gave up earlier or gave up entirely.
To me, this was very surprising.
It violates a lot of things that I had heard
in the kind of popular culture or the self-help literature
that people will work much harder to avoid losing something than they will to gain something.
But it did fit well with another set of experiments
that I'm very familiar with from the neuroscience literature.
So the experiment that I want to tell you about
is called the tube test.
Here's the experiment.
You take two rats, you put them in a tube,
or two mice, you put them in a tube.
And mice and rats, they don't like to share the same tube.
So what they'll do is they'll start pushing each other
back and forth, back and forth.
Sooner or later, one of the rats or mice
pushes the other one out.
Now you take the winner, you give it a new competitor,
and what you find is that the mouse or rat
that won previously
has a much higher than chance probability
of winning the second time.
In other words, winning before leads to winning again.
Three years ago, there was a paper published
that examined the brain area that's involved in this.
Turns out it's a particular area of the frontal cortex
for those of you that want to know.
And they did a simple experiment where they,
the experimenters increased or decreased the activity
of this brain area in the prefrontal cortex,
little sub region of the prefrontal cortex.
And what they found is if they stimulated this brain area,
a mouse or rat, regardless of whether or not
it had been a winner or loser before,
became a winner every single time.
So what is this magic brain area?
What is it doing?
Well, the reason I'm bringing this up today
and the reason I'm bringing it up
on the heels of the Super Mario effect
is that stimulation of this brain area
had a very simple and very important effect,
which was it led to more forward steps, more repetitions, more effort,
but not in terms of sheer might and will,
not digging deeper, just more repetitions per unit time.
And the losers had fewer repetitions per unit time.
So the Super Mario effect, this online experiment,
and the tube test, which has been done by various labs
and repeated again and again,
point to a simple but very important rule,
which is neither the 10,000 hours rule
nor the magic wand Hollywood version of learning,
but rather the neurobiological explanation
for learning a skill is you want to perform
as many repetitions per unit time as you possibly can,
at least when you're first trying to learn a skill.
The winners are always generating more repetitions
per unit time.
It's just a repeat of performance, repeat of performance,
even if there are errors.
And that points to something vitally important,
which is reps are important,
but making error reps is also important.
In fact, it might be the most important factor.
So let's talk about errors
and why those solve the problem of what to focus on.
Because as I said earlier,
if you want to learn something,
you need to know if it's open loop or closed loop,
and you need to know what to focus on,
where to place your perception.
And that seems like a tough task,
but errors will tell you exactly what to focus on.
And the reason is that the errors
actually cue your nervous system to two things.
One, to error correction,
and the other is it opens the door
or the window for neuroplasticity.
Errors tell your nervous system
that something needs to change.
So if you are performing a task or a skill,
like you're learning how to dance
and you're stepping on the other person's toes
or you're fumbling or you're not getting it right,
those errors are opening the possibility for plasticity.
If you walk away at that point,
you've made the exact wrong choice.
Without errors, the brain is not in a position
to change itself.
Errors actually cue the frontal cortex networks,
what we call top-down processing,
and the neuromodulators,
things like dopamine and acetylcholine and epinephrine,
that will allow for plasticity.
So these errors cue the brain that something was wrong
and they open up the possibility for plasticity.
It's what's sometimes called the framing effect.
It frames what's important, right?
This isn't about a motivation to learn.
This is about how you actually learn.
So the key is designate a particular block of time
that you are going to perform repetitions,
work for time, and then try and perform
the maximum number of repetitions that you can do safely.
That's going to be the best way to approach learning
for most sessions.
I will talk about other things that one can do,
but making errors is key.
And this isn't a motivational speech.
I'm not saying, oh, go make errors,
errors are good for you.
You have to fail in order to win.
No, you have to fail in order to open up the possibility
of plasticity, but you have to fail many times
within the same session.
And those failures will cue your attention
to the appropriate sensory events.
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So science points to the fact that
there's a particular sequencing of learning sessions
that will allow you to learn faster
and to retain the skill learning.
And it involves doing exactly as I just described,
which is getting as many repetitions as you can
in the learning session,
paying attention to the errors that you make,
and then the rewards that will be generated,
again, these are neurochemical rewards,
from the successful performance of a movement,
and then after the session,
you need to do something very specific,
which is nothing.
That's right.
After a skill learning session,
there's a replay of the motor sequence
that you performed correctly.
And there's an elimination of the motor sequences
that you performed incorrectly.
Okay, so to be very clear about this,
after I finished the training session,
if I do nothing, if I just sit there
and close my eyes for five to 10 minutes, even one minute,
the brain starts to replay the motor sequence
in a way that appears important
for the more rapid consolidation
of the motor sequence of the pattern
and to accelerated learning.
So you have this basic learning session
and then a period of time afterwards
in which the brain can rehearse what it just did
at the beginning of learning any skill.
And as we approach from uncertain to skilled to mastery,
we want to reduce uncertainty.
And that's really what the nervous system is doing.
It's trying to eliminate errors
and hone in on the correct trajectories.
If you perform a lot of repetitions
and then you use a period immediately after,
we don't really have a name for this post-learning
kind of idle time for the brain.
The brain isn't idle at all.
It's actually scripting all these things in reverse
that allow for deeper learning and more quick learning.
But if we fill that time with other things,
if we are focused on our phones
or we're focused on learning something else,
we're focusing on our performance,
that's not going to serve us well.
It's at least it's not going to serve
the skill learning well.
So please, if you're interested in more rapid skill learning,
try introducing these sessions.
They can be quite powerful.
But once you're familiar with something
and you're performing it well every once in a while,
you're accomplishing it better every once in a while,
then you can start to cue your attention
in very deliberate ways.
And so we hear a lot about chunking,
about breaking things down into their component parts.
But one of the biggest challenges for skill learning
is knowing where to place your attention.
So to dial out again,
we're building a protocol across this episode,
early sessions, maybe it's the first one,
maybe it's the first 10,
but during those initial sessions,
the key is to make many errors,
to let the reward process govern the plasticity,
let the errors open the plasticity,
and then after the learning sessions,
to let the brain go idle,
at least for a short period of time,
and of course, to maximize sleep.
As you start incorporating more sessions,
you start to gain some skill level,
learning to harness and focus your attention
on particular features of the movement
independent of the rewards and the feedback, right?
So the reward is no longer whether or not
you struck the target correctly,
but simply the motor movement, focusing your,
for instance, in a dart throw on the action of your arm,
that is embedding the plasticity
in the motor pattern most deeply.
That's what's been shown by the scientific literature.
So we're breaking the learning process
down into its component parts.
As we get more and more skilled,
meaning as we make fewer and fewer errors
per a given session per unit time,
that's when attention can start to migrate
from one feature such as the motor sequence
to another feature, which is perhaps one's stance
and another sequence component of the sequence,
which would be the result that's one getting
on a trial to trial basis.
Some of you may be wondering about speed of movement.
There are some data,
meaning some decent papers out there,
showing that ultra slow movements,
performing a movement essentially in slow motion
can be beneficial for enhancing the rate of skill learning.
However, at least from my read of the literature,
it appears that ultra slow movements should be performed
after some degree of proficiency has already been gained
in that particular movement.
Now that's not the way I would have thought about it.
I would have thought, well, you know,
if you're learning how to do a proper kick
or a punch in martial arts or something
that ultra slow movements at first
are going to be the way that one can best learn
how to perform a movement.
And then you just gradually increase the speed.
And it turns out that's not the case.
And I probably should have known that.
And you should probably know that
because it turns out that when you do ultra slow movements,
two things aren't available to you.
One is the proprioceptive feedback is not accurate
because fast movements of limbs are very different
than slow movements of limbs.
So you don't get the opportunity
to build in the proprioceptive feedback.
But the other reason why it doesn't work
is that it's too accurate.
You don't generate errors.
And so the data that I was able to find
showed that very slow movements can be beneficial
if one is already proficient in a practice.
When should you start to introduce slow learning?
Well, it appears that once you're hitting success rates
of about 25 or 30%, that's where the super slow movements
can start to be beneficial.
But if you're still performing things at a rate of,
five or 10% correct and the rest are errors,
then the super slow movements are probably
not going to benefit you that much.
Also super slow movements are not really applicable
to a lot of things.
For instance, you could imagine throwing a dart,
super slow motion,
but if you actually try and throw an actual dart,
the dart's just going to fall to the floor, obviously.
Some of you already have a fair degree of proficiency,
of skill in a given practice, or sport, or instrument.
And if you're in the sort of advanced intermediate
or advanced levels of proficiency for something.
There is a practice that you can find interesting data for
in the literature, which involves metronoming.
So this you'll realize relates to generating repetitions.
You can use a metronome to set the cadence
of your repetitions.
And if you do that, what athletes find
is they can perform more repetitions,
they can generate more output, you can increase speed.
A number of really interesting things
are being done with auditory metronoming.
There are actually some wild experiments out there.
You know, there's a world championship of cup stacking.
There's a young lady who I saw could take all these cups
spread out on a table and basically just stack them
into the perfect pyramid and the least amount of times
all the kids go wild.
This is something I never thought to pursue
and frankly never will pursue
unless my life depends on it for some reason.
But it's really impressive.
And if you look at the sequence,
cause these have been recorded,
you can look this up on YouTube.
What you'll find is that these expert cup stackers,
it's just all about error elimination.
But there too, metronoming and auditory cues
can actually cue them to pick up the cups faster
than they would ordinarily and to learn to do that.
Now, what's interesting about this and is cool
is that your attention is now harnessed to the tone,
to the metronome, not necessarily to what you're doing
in terms of the motor movement.
And so really you need a bit of proficiency.
Again, this is for people who are intermediate
or advanced, intermediate or advanced.
But what you're essentially doing is
you're creating an outside pressure, a contingency,
so that you generate again, more errors.
So it's all about the errors that you get.
And if you harness your attention
to this outside contingency,
this metronome that's firing off and saying,
now go, now go, now go.
Not only can you increase the number
of repetitions, errors and successes,
but for some reason, and we don't know why,
the regular cadence of the tone of the metronome
and the fact that you are anchoring your movements
to some external force, to some external pressure or cue,
seems to accelerate the plasticity and the changes
and the acquisition of skills beyond what it would be
if you just did the same number of repetitions
without that outside pressure.
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Let's talk about visualization and mental rehearsal.
I've been asked about this a lot
and I think it relates back to that kind of matrix,
Hollywood idea that we can just be embedded with a skill.
But the question we're going to deal with today is,
does it help?
Does it let you learn things faster?
And indeed the answer appears to be yes, it can.
However, despite what you've heard, it is not as good.
It is not a total replacement
for physical performance itself.
Okay, so I'm going to be really concrete about this.
I hear all the time that just imagining contracting a muscle
can lead to the same gains as imagining contracting a muscle can lead to the same gains
as actually contracting that muscle.
Just imagining a skill can lead to the same increases
in performance as actually executing that skill.
And that's simply not the case.
However, it can supplement or support physical training
and skill learning in ways that are quite powerful.
Mental rehearsal, closing one's eyes typically
and thinking about a particular sequence of movement
and visualizing it in one's quote unquote mind's eye
creates activation of the upper motor neurons
that's very similar if not the same as the actual movement.
And that makes sense
because the upper motor neurons are all about as the actual movement. And that makes sense because the upper motor neurons
are all about the command for movement.
They are not the ones that actually execute the movement.
Okay, remember upper motor neurons
are the ones that generate the command for movement,
not the actual movement.
The ones that generate the actual movement
are the lower motor neurons
and the central pattern generators.
So the point is,
if you want to use visualization training, great, but forget the idea that visualization training
is as good as the actual behavior.
You hear this all the time.
People say, do you know that if you imagine an experience
to your brain and to your body,
it's exactly the same as the actual experience?
Absolutely not.
This is not the way the nervous system works.
I'm sorry, I don't mean to burst anybody's bubble,
but your bubble is made of myths.
And the fact of the matter is that the brain,
when it executes movement,
is generating proprioceptive feedback.
And that proprioceptive feedback is critically involved
in generating our sense of the experience
and in things like learning.
So I don't say this because I don't like the idea
that visualization couldn't work.
In fact, visualization does work,
but it doesn't work as well.
It doesn't create the same milieu,
the same chemical milieu, the same environment
as actual physically engaging in the behavior,
the skill, the resistance training, et cetera.
Many of you are probably asking,
what can I take in order to accelerate skill learning?
Well, the conditions are going to vary,
but motivation is key.
You have to show up to the training session motivated
enough to focus your attention and to perform a lot
of repetitions in the training sequence.
That's just a prerequisite, all right?
There's no pill that's going to allow you
to do fewer repetitions and extract more learning
out of fewer repetitions.
It's actually more a question of what are the conditions
that you can create for yourself
such that you can generate more repetitions per unit time?
I think that's the right way to think about it.
What are the conditions that you can create for yourself
in your mind and in your body
that are going to allow you to focus.
There are a few compounds
that I think are worth mentioning
because of their ability to improve
the actual physical performance,
the actual execution of certain types of movements.
And some of these have also been shown
to improve cognitive function,
especially in older populations.
So I'd be remiss if I didn't at least mention them.
I'm only going to mention one today, in fact,
the one that's particularly interesting
and for which there really are a lot of data is alpha GPC.
And I'm going to attempt to pronounce
what alpha GPC actually is.
It's alpha glycerophosphocholine, right?
Alpha GPC, alpha glycerophosphocholine. See, if I keep doing it over and over, repetitions, alpha glycerophosphocholine, right? Alpha GPC, alpha glycerophosphocholine.
See, if I keep doing it over and over,
repetitions, alpha glycerophosphocholine.
There, I made an error.
Okay, so the point is that alpha GPC,
which is at least in the United States
is sold over the counter,
typically is taken in dosages of about 300 to 600 milligrams.
That's a single dose or have been shown to do a number of things
that for some of you might be beneficial.
One is to enhance power output.
So if you're engaging in something
like resistance training or sprinting
or something where you have to generate a lot of power,
well then in theory, alpha GPC could be beneficial to you.
A study noted a 14% increase in power output.
That's pretty substantial, you know, 14%
if you think about it, but it wasn't like a doubling
or something of that sort.
So as you can see, things like alpha GPC in particular,
when they are combined with low levels of caffeine
can have these effects of improving power output,
can improve growth hormone release,
can improve fat oxidation,
all these things in theory can support skill learning.
But what they're really doing is they're adjusting
the foundation upon which you are going to execute
these many, many repetitions, okay?
The same thing would be said for caffeine itself.
If that's something that motivates you
and gets you out of a chair
to actually do the physical training,
then that's something that motivates you and gets you out of a chair to actually do the physical training, then that's something that can perhaps improve
or enhance the rate of skill learning
and how well you retain those skills.
Now on a previous episode, I talked about,
and this was the episode on epinephrine on adrenaline,
I talked about how for mental, for cognitive learning,
it makes sense to spike epinephrine,
to bump ephrine levels up,
adrenaline levels up after cognitive learning.
For physical learning, it appears to be the opposite,
that if caffeine is in your practice,
or if you decide to try alpha GPC,
that you would want to do that before the training,
take it before the training, use it,
its effect should extend into the training,
presumably throughout.
A lot of the questions I get are about
how different protocols and things that I described
start to collide with one another.
So let's say, for instance, you go to bed at 10 30,
and you're going to do your skill training at 9 30.
Well, taking a lot of caffeine
then is not going to be a good idea
because it's going to compromise your sleep.
So I'm not here to design the perfect schedule for you
because everyone's situations vary.
So the things to optimize are repetitions, failures,
more repetitions, more failures.
At the offset of training, having some idle time
that could be straight into sleep,
or it could be simply letting the brain just go idle
for five to 10 minutes,
meaning not focusing on anything,
not scrolling social media, not emailing,
not ideally not even talking to somebody,
just lying down or sitting quietly with your eyes closed,
letting those motor sequences replay.
Use things like metronoming,
where you're cueing your attention to some external cue,
some stimulus, in this case,
an auditory stimulus most likely,
and trying to generate more repetitions per unit time.
So you now are armed with a lot of information
about how you generate movement.
And I like to think that you're also armed
with a lot of information about how to design protocols
that are optimized for you,
or if you're a coach,
for your trainees, in order to optimize their learning
of skills of various kinds.
And I should say that for those of you that are short
on time or have limited amounts of time,
10 minutes of maximum repetitions, maximum focus,
skill learning work is going to be very beneficial.
It's really about the density of training
inside of a session.
So I think you should let the,
work toward maximal or near maximal density of repetitions
and failures provided they're failures
you can perform safely in order to accelerate skill learning
and don't let some arbitrary or in this case,
the ultradian constraint prevent you from engaging in that practice.
In other words, get the work in,
get as much work done as you can per unit time.
And based on the science, based on things that I've seen,
based on things that I'm now involved in
with various communities,
you will see the skill improve vastly at various stages.
Sometimes it's a little bit stutter start.
It's not always a linear improvement,
but you will see incredible improvement in skill.
Today we talked all about skill learning.
I hope that you'll consider the information.
You might even decide to try some of these tools.
If you do, please let us know your results with them.
Give us feedback in the comments.
And as always, thank you for your interest in science.
["Science Files"]