Научная статья на тему 'Brain–Computer Interface and Neurofeedback Technologies: Current State, Problems and Clinical Prospects (Review)'

Brain–Computer Interface and Neurofeedback Technologies: Current State, Problems and Clinical Prospects (Review) Текст научной статьи по специальности «Клиническая медицина»

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Ключевые слова
bioelectric control / brain-computer interface / neurofeedback / electroencephalogram / EEG

Аннотация научной статьи по клинической медицине, автор научной работы — А. I. Fedotchev, S. B. Parin, S. A. Polevaya, S. D. Velikova

Brain-computer interface and neurofeedback technologies are unique techniques to modulate brain activity based on an operant conditioning. From the time these technologies appeared in the 60-ies of the XX c., they have become non-drug tools for numerous psychiatric and neurologic disorders. However, up to now their efficiency is a matter of debate. Our review considers the background, characteristic features and current state of the technologies. The emphasis was made on the analysis of capabilities and prospects of the technologies in clinical medicine to mobilize the plasticity mechanisms of brain neural network. The review presents the findings of our own experiments showing the future of brain-computer interface and neurofeedback technologies to depend on multi-type cooperation of neurologists, neurobiologists, engineers and mathematicians. Effective consolidation of several fields of science will enable to develop novel therapeutic regimens to restore and improve neural, cognitive and behavioral functions.

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Текст научной работы на тему «Brain–Computer Interface and Neurofeedback Technologies: Current State, Problems and Clinical Prospects (Review)»

Brain-Computer Interface am Current State, Problems and

DOI: 10.17691/stm2017.9.1.22 Received October 4, 2016

A.I. Fedotchev, DSc, Leading Researcher, Laboratory of Reception Mechanisms S.B. Parin, DSc, Head of the Laboratory of Psychophysiology2; S.A. Polevaya, DSc, Head of the Department of Psychophysiology2; Head of the Depa of Neurophysiology and Experimental Modelling, Central Scientific Research Laboratory3 S.D. Velikova, DSc, Scientific Consultant, Department of Neurophysiology and Experimenta Central Scientific Research Laboratory3

Institute of Cell Biophysics, Russian Academy of Sciences, 3 Institutskaya St., Pushchino, Moscow I 142290, Russian Federation;

2Lobachevsky State University of Nizhni Novgorod, 23 Prospekt Gagarina, Nizhny Novgorod, 603950, Russian Federation;

3Nizhny Novgorod State Medical Academy, 10/1 Minin and Pozharsky Square, Nizhny Novgorod, 603005, Russian Federation

Brain-computer interface and neurofeedback technologies are unique techniques to modulate brain activity based on an operant conditioning. From the time these technologies appeared in the 60-ies of the XX c., they have become non-drug tools for numerous psychiatric and neurologic disorders. However, up to now their efficiency is a matter of debate. Our review considers the background, characteristic features and current state of the technologies. The emphasis was made on the analysis of capabilities and prospects of the technologies in clinical medicine to mobilize the plasticity mechanisms of brain neural network. The review presents the findings of our own experiments showing the future of brain-computer interface and neurofeedback technologies to depend on multi-type cooperation of neurologists, neurobiologists, engineers and mathematicians. Effective consolidation of several fields of science will enable to develop novel therapeutic regimens to restore and improve neural, cognitive and behavioral functions.

Key words: bioelectric control; brain-computer interface; neurofeedback; electroencephalogram; EEG.

In the second half of the last century neurophysiologists made a breakthrough. They stated that the body functions formerly thought as involuntary and without self-regulation can under certain conditions be human controlled. The main condition is that a human by means of various facilities receives feedback signals on a current body state. The discovery resulted in two independent research lines based on the use of feedback signals from human brain potentials to control its functions.

The first research trend is based on bioelectric control and associated with computer information management systems mediating the communication between the brain and different devices. The technologies were called brain-computer interface (BCI). They enable a human to control a computer and other devices using brain signals recorded on the head surface in a form of an electroencephalogram (EEG), i.e. avoiding data transfer by nerves and muscles [1].

The second trend is based on I.P. Pavlov theory of conditioned reflexes and its development in the studies devoted to human EEG operant conditioning [2]. Due

For contacts: Alexander I. Fedotchev, e-mail: fedotchev@mail.ru

to the researches showing the capabilities of voluntary rearrangement and overfitting of brain wave patterns using a conditioning principle there was formed a biocontrol technology with feedback by EEG, or neurofeedback (NFB) [3].

Both technologies have common features, as well as differences. The presence of common features enabled some researchers either to consider them together [4] or regard NFB technology as one of the earliest applications of BCI technology [5], or its special case aimed at using external feedback rather than control an external device to model certain aspects of a physiological brain signal [6]. The main difference of these two approaches is in the ratio of automatic and controlled feedback processing of signals from brain potentials. If in BCI these signals do not require perception automatically controlling operational units, or modeling the parameters of external actions, then in NFB, brain potentials are converted to informational feedback signals to teach a human for conscious voluntary regulation of his own functions.

Currently, there is an intense interest in both research trends. It manifested, primarily, in a great number of

analytical reviews on various aspects of neurointerfaces [7-21]. In addition, over the last 5 years, the publications on BCI and NFB in PubMed have increased by 2-3 times. Such exponential growth of researchers, different authors link to inefficiency of conventional techniques of pharmacological treatment [22-26], with more thorough understanding of brain plasticity mechanisms and increasing dissatisfaction with current rehabilitation methods [27-29], as well as with rapid growth of computational capacities, robotized technologies, techniques for brain signal recording and mathematical algorithms for their decoding [30].

The abundance of recent publications on the issue and a great variety of the methods used make it difficult to assess generally the situation in this field of knowledge, and distinguish the approaches to the utmost appropriate for clinical medicine. The present review has summarized the reports in literature over the last 5 years on the essence, characteristics and current state of BCI and NFB technologies. Particular attention is given to the capabilities and prospects of these technologies in medicine. The findings of the authors in this field have been presented.

Brain-computer interface

Brain-computer interface is a computer information management system, which records brain signals, analyzes and transforms them into commands coming to output devices to perform desired actions. According to the definition, BCI is a system measuring the brain activity and transforming it into an artificial output signal, which substitutes, recovers, triggers, supports, informs or improves a natural output signal, and in such a way, changes the current interactions of the brain with external and internal environments [31].

The year 1973 is considered to be the origin of BCI technology, when a term "brain-computer interface" was suggested, and there was set a plan of experimental studies on human brain-computer interaction [32]. However, there is every reason to believe that the trend is based on a bioelectric control technique, which was formed in 50-60-ies of the last century, and is developing rapidly nowadays. It presupposes the use of bioelectric potentials generated by human tissues or organs for automatic control of various external devices

[33]. A perfect example of the trend is a pioneer work by N.P. Bekhtereva demonstrating a rhythmical photic stimulation automatically controlled by the patient's brain electric signals to result in the increase in abundance of EEG alpha activity and being the most effective type of a functional load than common photostimulation types

[34]. Subsequently, different variants of this approach were used abroad for the treatment purposes, and were called "EEG-driven photic stimulation" or "alpha power dependent light stimulation" [35-37].

The major goal of BCI technology is in the substitution or recovery of useful functions for individuals unable to

perform them due to neuromuscular disorders, such as amyotrophic sclerosis, cerebral palsy, stroke or spinal injury [38-41].

Brain-computer interface is one of the most promising technologies in the sphere of treatment of neurological conditions and injuries. It enables to establish the communication between intact brain areas and auxiliary devices, which makes it possible to compensate motor and sensory functions. For example, the patients paralyzed due to spinal fracture, can restore their mobility using BCI, which connects neuronal structures of the motor cortex with robotic arms, exoskeletons or neuromorphic electrogenerators [42]. Moreover, sensory BCI can serve to recovery the sensitivity of paralyzed body parts by transmitting somatosensory sensations of touch, temperature, pain and vibrations in these patients [43]. There are some achievements in BCI development [44, 45] including those made in Russia [46-50].

In addition to neurostimulators aimed, mainly, at motor function recovering, BCI with an auxiliary function hold a prominent place in rehabilitation medicine. BCI makes it possible for patients, by acts of will, to type on a monitor screen, press virtual on-off buttons available for their self-maintenance, user devices of hospital beds, etc. The complex of such BCI systems assisting a patient can be called neurocommunicators, since they, in their own way, help a human without any muscular movements to choose certain symbols to type a text or a command on a computer screen [51, 52].


Neurofeedback technology is a computer information management system, which enables to modify brain biopotentials with an active participation of a patient himself. To accomplish this, a current amplitude of a certain EEG-rhythm using various computer means is reflected in parameters of light and/or audio feedback signals showing to a patient in order to teach him a conscious brain control of the intensity of own rhythmic EEG components to achieve desirable curative effects. If a human in real time can hear or see an adequate reflection of his own biopotentials, then he has an opportunity to learn to change them in a direction required. At first the achieved effects are short-term, but in the course of training in most people this skill is reinforced. Thus, NFB offers auxiliary facilities for non-drug rehabilitation of various brain pathologies [53].

In general, NFB system consists of five elements or processing steps: a brain signal reception, signal preliminary processing, distinguishing key features, feedback signal generation, and an adaptive training. After EEG recording, the data are preliminarily processed (e.g., artifact detection, removal, and correction), with generation and selection of features, and feedback signal computation and notation. The last step closes the feedback circuit, where a participant attempts to learn to use a feedback signal to change the

brain activity according to instructions. All the necessary steps are taken on a real-time basis. The distinguished features, as a rule, reflect quantitatively the activity level of a certain brain area or network, and a feedback signal transmits the information on the corresponding changes in the brain condition. Participants are trained to find and adapt the strategies in order to change intentionally the state of their brains in accordance with the preliminary instructions [5].

An initial stage of establishing NFB technology was a series of researches carried out by Kamiya in the 60-ies of the last century, which demonstrated the human capability to change voluntarily the intensity of spectral components of his own EEG [54]. Subsequently, this fact served as the basis for development a number of clinical NFB applications to treat many diseases through direct rearrangement of electric processes in brain.

The mechanisms of therapeutic action of NFB are still unclarified, though many studies are devoted to their understanding [55-58]. According to one concept, potential mechanisms of NFB are rearrangements of neural networks including the increase in their global interconnection and neuroplasticity [59]. Other researchers consider NFB to perform the adjustment of brain electric activity vibrations set up for such a homeostatic level, which provides an optimal balance between neural network flexibility and stability [60].

By present time there has been gained positive clinical experience of NFB application for a wide range of diseases. Among them there are attention deficit-hyperactivity disorder [61-65], learning disability [66], stroke [67], traumatic brain injury [68], uncontrolled epilepsy [69], substance abuse [70-72], depression [73], autism [74], migraine [75], eating disorders [76], pain syndromes [77, 78] and other pathologic conditions. It should be noted that regardless the origin of symptoms, NFB training hold out auxiliary facilities for rehabilitation through direct re-education of electric processes in the brain.

In literature one can encounter the data on curative effects of NFB application in psychiatric disorders, such as eating disorders, schizophrenia and psychoses [79], to treat the function of executive control in Tourette syndrome [80], as well as for recovery and improvement of functions in high performance sport [81].

It is worth mentioning that there are conflicting opinions on NFB efficiency in the treatment of various pathological conditions and disorders. Some authors consider NFB to be certainly effective and specific cure for epilepsy, attention deficit-hyperactivity disorder and anxiety disorders, probably effective — in the treatment of brain injuries, drug addiction and insomnia, and insufficiently effective — in depressive disorders, autism and posttraumatic stress disorders [23]. Other authors when studying the reports in literature have come to the conclusion that NFB is effective in autistic spectrum disorders, drug intervention, and brain injury consequences [59]. There is one more group of authors,

who think NFB to be a potentially clinical tool in severe neuropsychiatric disorders: schizophrenia, depression, Parkinson disease, etc. [82].

Problems and prospects of brain-computer interface and neurofeedback technologies

In spite of international recognition of the topic significance, specialized scientific journals, there are still a number of problems in BCI and NFB studies requiring solution.

For BCI technology optimization, two major tasks should be completed. Firstly, there should be selected the most dynamic biometric signals with the following distinguishing from them reliable markers of human mental efforts. The second task is to develop greatly individualized schedules of the procedure to form a command mental effort, which should result in clear and stable changes in the recorded electrographic or metabolic indices [52].

A progress is needed in the development of invasive and noninvasive BCI, as well as in the development of techniques of precisely targeted stimulation of brain or sensory channels with high spatial and temporal resolution to substitute the lost sensory inputs (e.g., touch sensation prosthesis in amputees), an immediate correction of dysfunctional networks (e.g., detection and mitigation of neuronal activity disturbance) and a long-term recovery of healthy functional networks through the use of brain plasticity neural mechanisms [45]. As a result, a new trend in medicine will advance — neuroprosthetics, or interdisciplinary research area including neuroscience, computer science, physiology, and biomedical engineering to substitute or recover motor, sensory or cognitive functions that could be damaged due to an injury or a disease [83].

There are many pending questions and problems in NFB. Some authors emphasize an insignificant number of strictly controlled studies and minimal samples used in the investigations devoted to different NFB variants despite the positive findings [23]. Other researchers analyzing the studies on NFB indicate such problems as: no adequate selection of an experiment design, an inadequate use of controlled conditions and control groups of test subjects, the lack of concepts of learning mechanisms participating in brain self-regulation [82].

Clinical prospects of NFB are thought to depend directly on the solution of the above-mentioned and other methodological problems, as well as the wider use of modern live brain imaging technologies (e.g., functional magnetic resonance tomography in a real-time mode, or near infrared spectroscopy). The utilization of the technologies using stricter research protocols will enable to throw light on in-deep NFB mechanisms, which are to contribute to the development of more effective clinical applications of neurointerfaces [84].

Two advanced tendencies can be distinguished in current studies on BCI and NFB. One of them is

related to the use of individually revealed specific EEG components instead of overmuch wide-band, predetermined traditional EEG rhythms [85]. According to some works [63, 86], such approach leads to the significant improving of treatment procedure efficiency. The second tendency consists in the combination of neurointerface technologies with other ones: transcranial magnetic stimulation [87] or audio-visual stimulation [88] that also improves the efficiency.

Musical neurointerface

One of the major problems in NFB technology is that of optimal organization of feedback signals as a key factor determining the success in biocontrol [89, 90]. However, the most promising approach to the organization of NFB procedures is a combined exploration focused on the interaction between the human brain, body and behavior [91]. The technology of musical NFB developed by the authors is just the technology combining the utmost individuality of biocontrol and the benefit of unconscious perception of the stimuli typical for musical therapy [92, 93].

The approach is based on the use of musical or musiclike stimuli, which are organized in strict accordance with the current values of patient's brain biopotentials. The characteristic feature of the technique is a musical feedback from narrow-frequency EEG-oscillators typical and relevant for an individual, and revealed in a real time mode based on a specifically developed dynamic approach [94-96].

Music is known to be able, on its own, to trigger strong emotions, change the mood and help in the treatment of psychiatric and neurologic disorders [97]. Music has an effect on human brain, basic body functions and behavior suppressing stress [98, 99], correcting the state of consciousness [100, 101] and serving as a universal therapeutic remedy [102]. Music has particular efficacy, if being presented according to individual brain characteristic of a patient [103-105]. In our situation musical impact is organized in strict accordance with narrow-frequency EEG-oscillators functionally significant for a patient, owing to which treatment procedures assume peculiar healing properties [106].

The key advantage of the musical NFB technology is the possibility of its application to correct unfavorable functional states under conditions, which do not require conscious efforts of test subjects. It is of particular concern in treatment procedures with children and patients with specific psychiatric conditions or those with drug therapy contraindicated. Therefore, musical NFB technology was successfully tested to correct psycho-emotional disorders in pregnancy and when watching out for labor [107, 108], as well as to eliminate stress-induced disorders [109]. Currently, there have been carried out the studies aimed at eliminating the signs of attention deficit-hyperactivity disorder in children by means of the present technology [110].


The carried out review of literature shows that, currently, neurointerface technologies are coming into use in medicine to substitute or recover useful functions in people incapable of performing these functions due to neuromuscular disorders or injuries, as well as to treat a wide range of diseases and disorders without medications.

Brain-computer interface technology enables to help compensate motor and sensory functions, contribute to the recovery of sensitivity of damaged body areas, makes it possible to perform an out-patient monitoring to detect and prevent potentially dangerous conditions (e.g., epileptic seizures). It will provide the recovery of some lost functions in paralyzed patients. Due to brain-computer interface technology paralyzed patients can, by acts of will, type on a monitor screen and press virtual on-off buttons available for their self-service of devices. Ultimately, by a multi-type cooperation of neurologists, psychologists, physicians, engineers and mathematicians the mentioned capabilities of brain-computer interface technology will be completed by accelerated education programs and targeted memory regeneration that will enable to extend significantly the sphere of its clinical application for both diagnostics of diseases and screening of risk groups, and also for effective correction of various pathological conditions.

Neurofeedback technology was initially oriented on clinical applications, and by now it has been successfully tested in treatment and correction of a large number of diseases and disorders ranging from attention deficit-hyperactivity disorder and autism to drug addiction and immunodeficiency. Despite a number of unsolved problems, by now a neurofeedback technology appears to be, at least, a very useful supplement for the existing treatment facilities. Looking forward, due to the development of more perfect research protocols, the use of modern technologies of human brain imaging and optimal organization of feedback signals (e.g., in the form of music), interface technologies can hold key positions in clinical practice.

Study Funding. The work was supported by Russian Foundation for Humanities, grants RFH No.15-06-10894 and 16-06-00133.

Conflicts of Interest. The authors have no conflicts of interest related to the present study.


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