What if you could change your behavior just by monitoring your brainwaves?
That’s the goal of neurofeedback therapy,
a non-drug method used to treat conditions
用于治疗多动症 抑郁症 焦虑症等疾病
from ADHD to depression and anxiety.
But the science behind neurofeedback is far from solid.
While it has some credible foundations, they’re buried pretty deep.
And the research in this field is riddled with conflicts and contradictions,
including whether the brainwaves it aims to correct are all that wrong in the first place.
Neurofeedback is a type of therapy that uses real-time data –
usually electrical data in the form of EEGs —
to supposedly teach you to regulate your brainwave patterns.
And the treatment relies on two concepts.
The first is operant conditioning:
the idea that consequences can strengthen a behavior.
Which is a bedrock principle of modern psychology —
we know that rewards are great for changing behaviors.
The second concept is neural plasticity.
When psychologists talk about brains being plastic,
they don’t mean, like, plastic plastic.
They mean that the way our brain is structured, and therefore how it functions,
is always changing and adapting to what life demands of us.
Neurofeedback leans heavily on both of these ideas.
The reasoning is that if you reward people for the behavior
or EEG pattern you want to see from them —
like concentrating better or calming down from an anxious state —
you’ll see lasting changes to neural pathways
that make them easier to achieve.
During a neurofeedback session,
readings of electrical brain activity are analyzed as they happen,
and feedback is given to the patient on whether or not those patterns look, well, normal.
This is despite the fact that there’s a lot of natural variation in what a “normal” brainwave is,
so neurofeedback practitioners are enforcing a subjective standard here.
In theory, this helps the patient pinpoint ways
to keep those apparently abnormal brain waves in check.
For example, if a patient is undergoing treatment for anxiety,
they can actively try to alter their brainwaves,
through focusing, relaxation or… whatever helps them look more “typical”.
If they manage it, they get a reward, like,
showing them their favorite movie.
Using this system of feedback and rewards,
practitioners say they can train people’s brain activity
to be in line with supposedlynormal brainwaves.
And that is supposed to resolve symptoms of a ton of different disorders!
比如多动症 精神分裂症 抑郁症等等
ADHD, schizophrenia, depression — and more.
Again — in theory.
Generally speaking, the research into neurofeedback is… kind of a hot mess.
Some meta-analyses, which look at data from across several studies to spot trends,
say it’s effective, but others don’t.
One review from 2016 gives a good snapshot of the situation,
and suggests why analyses might come to such different conclusions.
After trawling through everything, they identified 30 studies,
with a grand total of 1171 participants,
that met their criteria
for being scientifically sound.
That meant participants were randomized into experimental or control groups,
and that both participants and experimenters were blind
to which experimental condition they were in.
They also ensured the included studies were not funded
by companies that sell neurofeedback sessions,
which might have led to the findings being skewed.
Overall, the review of these 30 studies found mixed results.
Many of the studies showed that neurofeedback had some effect,
but the researchers found serious limitations throughout the entire body of research.
The methods used in a lot of the studies weren’t as rigorous as they needed to be
to suggest neurofeedback had any effect.
Many of the studies were poorly controlled.
Only three of those 30 studies had a placebo group —
an important control that makes sure people don’t start feeling better
simply because they expect to.
And most had sample sizes that were far too small
to draw any real conclusions.
They concluded that more large, well designed studies were needed
before neurofeedback could be considered a viable treatment.
While some patients seem to have found relief via neurofeedback,
that doesn’t necessarily mean that neurofeedback affects people in the way we think it might.
Some scientists raise issue with the fact
that neurofeedback practitioners might be targeting certain EEG variations
that don’t have much to do with the conditions they aim to treat.
After all, EEG patterns differ from person to person.
Two people’s patterns may not match each other,
but that doesn’t make one of them abnormal.
Critics argue that when there is a shift in a patient’s condition
or EEG after neurofeedback,
it might just be the result of the patient being conditioned to relax or refocus their attention.
But there’s no reason to think
that some supposed problem with their brainwaves has actually been fixed.
If the patient feels better about their condition, great —
but it still doesn’t mean neurofeedback is doing what its backers say it’s doing.
Even if it helps people somehow,
we need to know whether it works the way they claim.
For neurofeedback to really come into its own as an evidence-based therapy,
its practitioners will need to address all of these concerns.
They’ll need to improve their study designs.
They’ll need to really show what an atypical EEG looks like,
and then show that training those patterns improves the conditions they’re supposedly associated with.
Until then, however,
we’ll need to wait for some more rigorous research.
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