Affective Neuroscience, Blog, Cognitive Neuroscience, Cognitive Psychology, Uncategorized

Neurofeedback: learning to unlock the brain’s self-regulating ability

Have you noticed that some of our actions or behaviors are not carried out consciously?

The truth is that we are not fully aware of everything that happens inside our brain like all the connections triggered when an emotion or thought suddenly appears in our mind.

Instead, we know that the major brain activity is highly driven by both, internal biological signals linked to the autonomous system and external cues coming from the environment. Apparently, all these brain activity generators are beyond our conscious control. But is this really the case?

 

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A key to direct our cognitive performance

Generally speaking, cognitive performance is defined as the optimal execution of activities that involve multiple mental abilities  (e.g., Pattyn et al. 2008; Roy, 2013). From a  cognitive psychology perspective, cognitive performance entails managing various interacting processes such as perception, alertness, attention, memory, or executive functions like working memory. Such a number of brain processes are often assessed indirectly, through neurocognitive tools like measurements of response times or accuracy levels in the context of task performance.

Psychological and physiological factors such as fatigue, stress, motivation (Newell et al. 2008; Sutarto et al. 2010), and mood imbalances (Sutarto et al. 2013)  can have a huge influence on cognitive functioning. Sometimes these factors can prevent someone from performing optimally in normal life activities, negatively impacting daily performance.

What if we can have control over those hinder factors by simply learning how to track and train the activity of our neurons?

The main goal of Neurofeedback (NFB) therapy is to modulate the brain’s (dys) functions by regulating emotions and directing the attention focus. By improving the brain’s ability to shift between arousal states of excitement and relaxation, the related neural pathways can be either over-activated, under-activated, or dysregulated accordingly. Such neural adjustments result in an overall enhancement of mental performance, emotional management, and mood stability (Sitaram et al., 2017).

Neural mechanisms of brain (dys) functions

From scientific studies, we know that our brains contain billions of neurons that fire and communicate at the same time. There is an old saying in neuroscience that  “neurons that fire together wire together”. This basically means that the more a neural-circuit runs the stronger that circuit becomes.

In the context of NFB therapy, understanding the specific brain mechanisms underlying cognition is key to directly alter defective neural pathways causing dysfunctional behavior (Başar et al., Enriquez-Geppert et al., 2017).  For example, we know that anxiety disorders are characterized by an excess of activity in the parietal and occipital lobes. The treatment hence is focused on reducing or deactivating neural pathways involved.

Thanks to advances in brain technology it is possible to identify specific neural circuits that are relevant to emotion, motivation, and cognition functioning. When those neurons communicate with each other, they produce synchronized electrical impulses that result in brainwaves. To understand the fundamentals of neurofeedback, we must first understand how brainwaves work.

 

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Fig.1 Learning how to control or cognitive performance with neurofeedback involves the modulation of neural pathways underlying (dys) functional brain activity

 

Learning more about Neurofeedback:  brainwaves

Any behavior, emotion, or thought has associated a stream of brainwaves that can be differentiated based on its oscillatory frequency (measured in cycles/seconds or Hertz).  Depending on the particular brain state or activity,  the waves alternate between the following rhythms:

  • Delta brainwaves (1 to 4 Hz): This pattern occurs during deep stages of sleep when restorative processing is taking place. Having too little of this brainwave indicates a pattern of poor sleep, insomnia, or dissociation (Knyazev, 2012).  Pathological delta activity is observed in awake states consistent with generalized encephalopathy and focal cerebral dysfunction (Nayak et al., 2020).
  • Theta brainwaves (4 to 8 Hz): The brain is in this frequency band when we are in deep relaxation, and our mind wanders off or it is immersed in deep meditation. Excessive theta correlates with fatigue,  hypnotic states,  like the one experienced during highway hypnosis or freeway driving (sensation of falling sleep with eyes open; Craig et al., 2012).
  • Alpha brainwaves (8 to 12 Hz): Mostly predominates during a mindful state of calmness, sense of ease and relaxation, such as when a person is resting down after completing a task.  It represents a non-aroused state of mind (Mireau et al., 2017; Zhang et al., 2012). Atypical alpha activity, especially in frontal areas,  is often associated with adult ADHD and depression (Jaworska et al., 2012; Martijn Arns, 2012). An imbalance in alpha wave activity is consistent with alertness, agitation, irritability or avoidance behavior among other severe pathologies like substance addiction (Meda et al., 2019; Tayama et al., 2017).
  • Sensorimotor rhythm (SMR) brainwaves (12 to 15 Hz): This wave pattern is associated with an attentive state of mind like when one is alert navigating in virtual reality but without any movement (Scherer et al., 2008; Timmers, 2014). Imbalances in such activity can drive you to a depressed mind state or inattentiveness.
  • Beta brainwaves (15 to 32 Hz): These waves represent the fastest processing speed that typically occurs when the brain is externally focused, actively engaged in critical reasoning, thought, or highly concentrated performing an activity. When awake, most people exhibit beta wave patterns.  Excessive beta activity is a marker of a stressful mind, rumination likely indicating emotional distress (Hamid et al., 2015; Hayashi et al.,2009 )

 

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Fig.2 Pattern of abnormal and normalized activity in slow brainwaves before and after NFB treatment. Source image https://graymattersct.com/

 

Through the use of non-invasive brain-computer technology (EEG recordings), Neurofeedback therapy monitors brainwaves activity and trains the patient to self-regulate itself. This simply means to become aware of your own brain functioning processes allowing you to think and function at a more efficient level.

In a way, NFB training could be compared to having a teacher by your side kindly pointing out your errors and then,  helping you in knowing when and how to correct them.

 

Interesting but…how it works?

With Neurofeedback, an individual presenting a certain cognitive, behavioral, or affective deficit (e.g. attention deficit disorder, addiction disease,  anxiety),  can learn to adjust his/her EEG activity to mirror the desired pattern of cortical activity, and thus, perform better in daily basis. Such changes in the EEG pattern results in changes in the targeted behaviors. The way to manage this is by means of a rewarding visual and/or auditory feedback process.

A neurofeedback session begins with an EEG recording sequence that is completely directed or piloted by computer-based protocol, allowing monitoring brainwaves in real-time. Meanwhile, the system provides feedback to the user during the experience of the rewarding activity. Each time the desired EEG pattern occurs,  the program maintains “on” the rewarding activity (e.g. music, video game, or movie).  Instead, every time undesired  EEG signals appear, the program stops the rewarding activity.

If you think carefully, what is really going on is just an operant (or instrumental) conditioning learning process. Indeed, part of the success of neurofeedback in brain self-regulation relies on such a basic learning mechanism (Dessy et al., 2018). But the true “main character” in all this equation that explains why it definitely works so well, has to do with an amazing brain property called neuroplasticity.

 

nFB session
Fig.3 Example of a NFB session. It consists of training the brain across a specific number of sessions wherein the brainwaves are monitored allowing the patient to have control over the dysfunctional patterns of brain activity.

Neurofeedback and brain plasticity: how do they relate? 

Neuroplasticity is defined as the brain’s ability to alter its organization and connectivity patterns, based on new learning experiences and behaviors (Berlucchi and Buchtel, 2009)

The NFB therapy takes advantage of neuroplasticity to re-wire the brain allowing achieving a particular cognitive improvement, or even enabling more global treatment of several psychological/psychiatric disorders. With sustained training during a sufficient period of time,  the patient will gradually reorganize his neural connections optimizing brain functioning.

A common question is whether the achieved changes last long-term after receiving enough training. When modifications in the brain have been physically (changes in neuron morphology) and functionally accommodated (neural connectivity), they end up being automated, and therefore,  they last almost for entire life (Shaffer, 2016).

 

Who can benefit from Neurofeedback?

The proven benefits of Neurofeedback have been found to be beneficial in treating a variety of cognitive and affective disorders including attention-deficit/hyperactivity disorder (ADHD), depression, anxiety, post-traumatic stress disorder (PTSD), autism, and epilepsy among others. Also, it has been shown to be highly effective in the rehabilitation of traumatic brain injuries. The main advantage for patients is a progressive optimization of mental health mostly in medical resistant cases.

A variety of EEG-NFB scientifically proven protocols to treat patients are commonly used with excellent results. The so-called alpha augments, alpha/theta training, beta augments, sensorimotor rhythm (SMR) are the ones showing scientifically proven positive results in treating different pathologies (Cheon et al., 2015; Efthymios et al., 2007). However, these protocols are not generic and in clinical practice, they should be individualized according to the diagnosis and anamnesis of the patient.

 

NFB protocol
Fig. 4 The most widely used frequency-band training protocols to treat clinical pathologies.

 

Fortunately, healthy people can also benefit from the positive effects of Neurofeedback. In the field of cognitive skills enhancement, it can be very beneficial for elite athletes, artists, or simply for anyone who wants to improve attention/concentration, memory, or creativity (Ring et al., 2014).

Conclusions

Neurofeedback therapy is a non-invasive safe procedure with strong scientific support in the treatment of many problems and disorders. But it has its own pros and cons. To date, many studies have proven its effectiveness over placebo and other pharmacological treatments like in the case of children diagnosed with ADHD (Van Doren et al., 2018). However, the demonstration of more robust clinical effects remains a major handicap in neurofeedback research (Sitaram et al., 2017). In this regard,  evidence of sustained or long-term effects of NFB across pathologies needs further investigation in order to determine its validity as a potential pharmaco-replacement therapy (Rogala et al.,2016).

Moreover, the question of how many sessions are needed before a person can achieve the expected changes remains unclear given the high inter-individual variability. Certainly, desired improvements are very much linked to the level of commitment of the person/patient.

What does seem clear whatsoever, is that NFB provides new ways to understand brain-behavior relationships. Thanks to the current horizon in neurotechnological development and contributions of Cognitive Neuroscience research, the acceleration of NFB optimization even further becomes possible within this century.

 

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