Neurotechnology

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Neurotechnology encompasses any method or electronic device which interfaces with the nervous system to monitor or modulate neural activity. [1] [2]

Contents

Common design goals for neurotechnologies include using neural activity readings to control external devices such as neuroprosthetics, altering neural activity via neuromodulation to repair or normalize function affected by neurological disorders, [3] or augmenting cognitive abilities. [4] In addition to their therapeutic or commercial uses, neurotechnologies also constitute powerful research tools to advance fundamental neuroscience knowledge. [5] [6] [7] [8]

Some examples of neurotechnologies include deep brain stimulation, photostimulation based on optogenetics and photopharmacology, transcranial magnetic stimulation, transcranial electric stimulation and brain–computer interfaces, such as cochlear implants and retinal implants.


The field of neurotechnology has been around for nearly half a century but has only reached maturity in the last twenty years. Decoding basic procedures and interactions within the brain's neuronal activity is essential to integrate machines with the nervous system. [9] This is one of the central steps of the technological revolution based on a fusion of technologies that is blurring the lines between the physical, digital, and biological spheres. Integrating an electronic device with the nervous system enables monitoring and modulating neural activity as well as managing implemented machines by mental activity. Further work in this direction would have profound implications for improving existing and developing new treatments for neurological disorders and advanced "implantable neurotechnologies" as integrated artificial implants for various pieces of the nervous system. [9] Advances in these efforts are associated with developing models based on knowledge about natural processes in bio-systems that monitor and/or modulate neural activity. One promising direction evolves through studying the mother-fetus neurocognitive model. [10] According to this model, the innate natural mechanism ensures the embryonic nervous system's correct (balanced) development. [11] Because the mother-fetus interaction enables the child's nervous system to evolve with adequate biological sentience, similar environmental conditions can treat the injured nervous system. This means that the physiological processes of this natural neurostimulation during gestation underlie any noninvasive artificial neuromodulation technique. [11] This knowledge paves the way for designing and precise tuning noninvasive brain stimulation devices in treating different nervous system diseases within the scope of modulating neural activity. [11]

More specialized sectors of the neurotechnology development for monitoring and modulating neural activity are aimed at creating powerful concepts as "neuron-like electrodes", [12] "hybrid biotic–abiotic electrodes", [13] "planar complementary metal-oxide semiconductor systems", [14] "injectable bioconjugate nanomaterials", [15] "implantable optoelectronic microchips". [16] [17]

The advent of brain imaging revolutionized the field, allowing researchers to directly monitor the brain's activities during experiments. Practice in neurotechnology can be found in fields such as pharmaceutical practices, be it from drugs for depression, sleep, ADHD, or anti-neurotics to cancer scanning, stroke rehabilitation, etc.

Many in the field aim to control and harness more of what the brain does and how it influences lifestyles and personalities. Commonplace technologies already attempt to do this; games like BrainAge, [18] and programs like Fast ForWord [19] that aim to improve brain function, are neurotechnologies.

Currently, modern science can image nearly all aspects of the brain as well as control a degree of the function of the brain. It can help control depression, over-activation, sleep deprivation, and many other conditions. Therapeutically it can help improve stroke patients' motor coordination, improve brain function, reduce epileptic episodes (see epilepsy), improve patients with degenerative motor diseases (Parkinson's disease, Huntington's disease, ALS), and can even help alleviate phantom pain perception. [20] Advances in the field promise many new enhancements and rehabilitation methods for patients with neurological problems. The neurotechnology revolution has given rise to the Decade of the Mind initiative, which was started in 2007. [21] It also offers the possibility of revealing the mechanisms by which mind and consciousness emerge from the brain.

Types

Deep brain stimulation

Deep brain stimulation is currently used in patients with movement disorders to improve the quality of life in patients. [22]

Transcranial ultrasound stimulation

Transcrancial ultrasound stimulation (TUS) is a technique using ultrasound to modulate neural activity in the brain. It is an emerging technique that has shown therapeutic promise in a variety of neurological diseases. [23]

Transcranial magnetic stimulation

Transcranial magnetic stimulation (TMS) is a technique for applying magnetic fields to the brain to manipulate electrical activity at specific loci in the brain. [24] This field of study is currently receiving a large amount of attention due to the potential benefits that could come out of better understanding this technology. [25] Transcranial magnetic movement of particles in the brain shows promise for drug targeting and delivery as studies have demonstrated this to be noninvasive on brain physiology. [26]

Transcranial magnetic stimulation is a relatively new method of studying how the brain functions and is used in many research labs focused on behavioral disorders, epilepsy, PTSD, migraine, hallucinations, and other disorders. [25] Currently, repetitive transcranial magnetic stimulation is being researched to see if positive behavioral effects of TMS can be made more permanent. Some techniques combine TMS and another scanning method such as EEG to get additional information about brain activity such as cortical response. [27]

Transcranial direct current stimulation

Transcranial direct current stimulation (TDCS) is a form of neurostimulation which uses constant, low current delivered via electrodes placed on the scalp. The mechanisms underlying TDCS effects are still incompletely understood, but recent advances in neurotechnology allowing for in vivo assessment of brain electric activity during TDCS [28] promise to advance understanding of these mechanisms. Research into using TDCS on healthy adults have demonstrated that TDCS can increase cognitive performance on a variety of tasks, depending on the area of the brain being stimulated. TDCS has been used to enhance language and mathematical ability (though one form of TDCS was also found to inhibit math learning), [29] attention span, problem solving, memory, [30] coordination and relieve depression [31] [32] [33] and chronic fatigue. [34] [35]

Electrophysiology

Electroencephalography (EEG) is a method of measuring brainwave activity non-invasively. A number of electrodes are placed around the head and scalp and electrical signals are measured. [36] Clinically, EEGs are used to study epilepsy as well as stroke and tumor presence in the brain. Electrocorticography (ECoG) relies on similar principles but requires invasive implantation of electrodes on the brain's surface to measure local field potentials or action potentials more sensitively.

Magnetoencephalography (MEG) is another method of measuring activity in the brain by measuring the magnetic fields that arise from electrical currents in the brain. [37] The benefit to using MEG instead of EEG is that these fields are highly localized and give rise to better understanding of how specific loci react to stimulation or if these regions over-activate (as in epileptic seizures).

There are potential uses for EEG and MEG such as charting rehabilitation and improvement after trauma as well as testing neural conductivity in specific regions of epileptics or patients with personality disorders. EEG has been fundamental in understanding the resting brain during sleep. [36] Real-time EEG has been considered for use in lie detection. [38] Similarly, real-time fMRI is being researched as a method for pain therapy by altering how people perceive pain if they are made aware of how their brain is functioning while in pain. By providing direct and understandable feedback, researchers can help patients with chronic pain decrease their symptoms. [39]

Implants

Neurotechnological implants can be used to record and utilize brain activity to control other devices which provide feedback to the user or replace missing biological functions. [40] The most common neurodevices available for clinical use are deep brain stimulators implanted in the subthalamic nucleus for patients with Parkinson's disease. [22]

Pharmaceuticals

Pharmaceuticals play a vital role in maintaining stable brain chemistry, and are the most commonly used neurotechnology by the general public and medicine. Drugs like sertraline, methylphenidate, and zolpidem act as chemical modulators in the brain, and they allow for normal activity in many people whose brains cannot act normally under physiological conditions. While pharmaceuticals are usually not mentioned and have their own field, the role of pharmaceuticals is perhaps the most far-reaching and commonplace in modern society. Movement of magnetic particles to targeted brain regions for drug delivery is an emerging field of study and causes no detectable circuit damage. [26]

Ethical considerations

Like other disruptive innovations, neurotechnologies have the potential for profound social and legal repercussions, and as such their development and introduction to society raise a series of ethical questions. [41] [42] [2]

Key concerns include the preservation of identity, agency, cognitive liberty and privacy as neurorights. While experts agree that these core features of the human experience stand to benefit from the ethical use of neurotechnology, they also make a point of emphasizing the importance of preventively establishing specific regulatory frameworks and other mechanisms that protect against inappropriate or unauthorized uses. [1] [41] [43]

Identity

Identity in this context refers to personal continuity, described as bodily and mental integrity and their persistence over time. In other words, it is the individual's self-narrative and concept of self.

While disruption of identity is not a common goal for neurotechnologies, some techniques can create unwanted shifts that range in severity. For instance, deep brain stimulation is commonly used as treatment for Parkinson's disease but can have side effects that touch on the concept of identity, such as loss of voice modulation, increased impulsivity or feelings of self-estrangement. [1] [44] [45] [46] In the case of neural prostheses and brain-computer interfaces, the shift may take the form of an extension of one's sense of self, potentially incorporating the device as an integral part of oneself or expanding the range of sensory and cognitive channels available to the user beyond the traditional senses. [1] [47]

Part of the difficulty in determining which changes constitute a threat to identity is rooted in its dynamic nature: since one's personality and concept of self is expected to change with time as a result of emotional development and lived experience, it is not easy to identify clear criteria and draw a line between acceptable shifts and problematic changes. [1] [48] This becomes even harder when dealing with neurotechnologies aimed at influencing psychological processes—such as those designed to recude the symptoms of depression or post-traumatic stress disorder (PTSD) by modulating emotional states or saliency of memories to ease a patient's pain. [49] [50] Even helping a patient remember, which would seemingly help preserve identity, can be a delicate question: "Forgetting is also important to how a person navigates the world, since it allows the opportunity for both losing track of embarrassing or difficult memories, and focusing on future-oriented activity. Efforts to enhance identity through memory preservation thus run the risk of inadvertently damaging a valuable, if less consciously-driven cognitive process." [1]

Agency

Although the nuances of its definition are debated in philosophy and sociology, [51] agency is commonly understood as the individual's ability to consciously make and communicate a decision or choice. While identity and agency are distinct, an impairment in agency can in turn undermine personal identity: the subject may no longer be able to substantially modify their own self-narrative, and may therefore lose their ability to contribute to the dynamic process of identity formation. [48]

The interplay between agency and neurotechnology can have implications for moral responsibility and legal liability. [52] [42] As with identity, devices aimed at treating some psychiatric conditions like depression or anorexia may work by modulating neural function linked with desire or motivation, potentially compromising the user's agency. [49] [53] This can also be the case, paradoxically, for those neurotechnologies designed to restore agency to patients, such as neural prostheses and BCI-mediated assistive technology like wheelchairs or computer accessibility tools. [54] [55] Because these devices often operate by interpreting sensory inputs or the user's neural data in order to estimate the individual's intention and respond according to it, estimation margins can lead to inaccurate or undesired responses that may threaten agency: "If the agent's intent and the device's output can come apart (think of how the auto-correct function in texting sometimes misinterprets the user's intent and sends problematic text messages), the user's sense of agency may be undermined." [1]

Privacy

Finally, when these technologies are being developed society must understand that these neurotechnologies could reveal the one thing that people can always keep secret: what they are thinking. While there are large amounts of benefits associated with these technologies, it is necessary for scientists, citizens and policy makers alike to consider implications for privacy. [56] This term is important in many ethical circles concerned with the state and goals of progress in the field of neurotechnology (see neuroethics). Current improvements such as "brain fingerprinting" or lie detection using EEG or fMRI could give rise to a set fixture of loci/emotional relationships in the brain, although these technologies are still years away from full application. [56] It is important to consider how all these neurotechnologies might affect the future of society, and it is suggested that political, scientific, and civil debates are heard about the implementation of these newer technologies that potentially offer a new wealth of once-private information. [56] Some ethicists are also concerned with the use of TMS and fear that the technique could be used to alter patients in ways that are undesired by the patient. [25]

Cognitive liberty

Cognitive liberty refers to a suggested right to self-determination of individuals to control their own mental processes, cognition, and consciousness including by the use of various neurotechnologies and psychoactive substances. This perceived right is relevant for reformation and development of associated laws.

See also

Related Research Articles

<span class="mw-page-title-main">Transcranial magnetic stimulation</span> Brain stimulation using magnetic fields

Transcranial magnetic stimulation (TMS) is a noninvasive neurotherapy, a form of brain stimulation in which a changing magnetic field is used to induce an electric current at a specific area of the brain through electromagnetic induction. An electric pulse generator, or stimulator, is connected to a magnetic coil connected to the scalp. The stimulator generates a changing electric current within the coil which creates a varying magnetic field, inducing a current within a region in the brain itself.

<span class="mw-page-title-main">Brain–computer interface</span> Direct communication pathway between an enhanced or wired brain and an external device

A brain–computer interface (BCI), sometimes called a brain–machine interface (BMI), is a direct communication link between the brain's electrical activity and an external device, most commonly a computer or robotic limb. BCIs are often directed at researching, mapping, assisting, augmenting, or repairing human cognitive or sensory-motor functions. They are often conceptualized as a human–machine interface that skips the intermediary of moving body parts (hands...), although they also raise the possibility of erasing the distinction between brain and machine. BCI implementations range from non-invasive and partially invasive to invasive, based on how physically close electrodes are to brain tissue.

<span class="mw-page-title-main">Phosphene</span> Visual illusion

A phosphene is the phenomenon of seeing light without light entering the eye. The word phosphene comes from the Greek words phos (light) and phainein. Phosphenes that are induced by movement or sound may be associated with optic neuritis.

Neural engineering is a discipline within biomedical engineering that uses engineering techniques to understand, repair, replace, or enhance neural systems. Neural engineers are uniquely qualified to solve design problems at the interface of living neural tissue and non-living constructs.

Neurohacking is a subclass of biohacking, focused specifically on the brain. Neurohackers seek to better themselves or others by “hacking the brain” to improve reflexes, learn faster, or treat psychological disorders. The modern neurohacking movement has been around since the 1980s. However, herbal supplements have been used to increase brain function for hundreds of years. After a brief period marked by a lack of research in the area, neurohacking started regaining interest in the early 2000s. Currently, most neurohacking is performed via do-it-yourself (DIY) methods by in-home users.

Social neuroscience is an interdisciplinary field devoted to understanding the relationship between social experiences and biological systems. Humans are fundamentally a social species, and studies indicate that various social influences, including life events, poverty, unemployment and loneliness can influence health related biomarkers. Still a young field, social neuroscience is closely related to personality neuroscience, affective neuroscience and cognitive neuroscience, focusing on how the brain mediates social interactions. The biological underpinnings of social cognition are investigated in social cognitive neuroscience.

<span class="mw-page-title-main">Neuroimaging</span> Set of techniques to measure and visualize aspects of the nervous system

Neuroimaging is the use of quantitative (computational) techniques to study the structure and function of the central nervous system, developed as an objective way of scientifically studying the healthy human brain in a non-invasive manner. Increasingly it is also being used for quantitative research studies of brain disease and psychiatric illness. Neuroimaging is highly multidisciplinary involving neuroscience, computer science, psychology and statistics, and is not a medical specialty. Neuroimaging is sometimes confused with neuroradiology.

In neuroscience, single-unit recordings provide a method of measuring the electro-physiological responses of a single neuron using a microelectrode system. When a neuron generates an action potential, the signal propagates down the neuron as a current which flows in and out of the cell through excitable membrane regions in the soma and axon. A microelectrode is inserted into the brain, where it can record the rate of change in voltage with respect to time. These microelectrodes must be fine-tipped, impedance matching; they are primarily glass micro-pipettes, metal microelectrodes made of platinum, tungsten, iridium or even iridium oxide. Microelectrodes can be carefully placed close to the cell membrane, allowing the ability to record extracellularly.

Neuroergonomics is the application of neuroscience to ergonomics. Traditional ergonomic studies rely predominantly on psychological explanations to address human factors issues such as: work performance, operational safety, and workplace-related risks. Neuroergonomics, in contrast, addresses the biological substrates of ergonomic concerns, with an emphasis on the role of the human nervous system.

<span class="mw-page-title-main">Transcranial direct-current stimulation</span> Technique of brain electric stimulation therapy

Transcranial direct current stimulation (tDCS) is a form of neuromodulation that uses constant, low direct current delivered via electrodes on the head. This type of neurotherapy was originally developed to help patients with brain injuries or neuropsychiatric conditions such as major depressive disorder. It can be contrasted with cranial electrotherapy stimulation, which generally uses alternating current the same way, as well as transcranial magnetic stimulation.

Integrative neuroscience is the study of neuroscience that works to unify functional organization data to better understand complex structures and behaviors. The relationship between structure and function, and how the regions and functions connect to each other. Different parts of the brain carrying out different tasks, interconnecting to come together allowing complex behavior. Integrative neuroscience works to fill gaps in knowledge that can largely be accomplished with data sharing, to create understanding of systems, currently being applied to simulation neuroscience: Computer Modeling of the brain that integrates functional groups together.

Neurostimulation is the purposeful modulation of the nervous system's activity using invasive or non-invasive means. Neurostimulation usually refers to the electromagnetic approaches to neuromodulation.

The temporal dynamics of music and language describes how the brain coordinates its different regions to process musical and vocal sounds. Both music and language feature rhythmic and melodic structure. Both employ a finite set of basic elements that are combined in ordered ways to create complete musical or lingual ideas.

Neuromodulation is "the alteration of nerve activity through targeted delivery of a stimulus, such as electrical stimulation or chemical agents, to specific neurological sites in the body". It is carried out to normalize – or modulate – nervous tissue function. Neuromodulation is an evolving therapy that can involve a range of electromagnetic stimuli such as a magnetic field (rTMS), an electric current, or a drug instilled directly in the subdural space. Emerging applications involve targeted introduction of genes or gene regulators and light (optogenetics), and by 2014, these had been at minimum demonstrated in mammalian models, or first-in-human data had been acquired. The most clinical experience has been with electrical stimulation.

A cortical implant is a subset of neuroprosthetics that is in direct connection with the cerebral cortex of the brain. By directly interfacing with different regions of the cortex, the cortical implant can provide stimulation to an immediate area and provide different benefits, depending on its design and placement. A typical cortical implant is an implantable microelectrode array, which is a small device through which a neural signal can be received or transmitted.

Transcranial random noise stimulation (tRNS) is a non-invasive brain stimulation technique and a form of transcranial electrical stimulation (tES). Terney et al from Göttingen University was the first group to apply tRNS in humans in 2008. They showed that by using an alternate current along with random amplitude and frequency in healthy subjects, the motor cortex excitability increased for up to 60 minutes after 10 minutes of stimulation. The study included all the frequencies up to half of the sampling rate i.e. 640 Hz, however the positive effect was limited only to higher frequencies. Although tRNS has shown positive effects in various studies the optimal parameters, as well as the potential clinical effects of this technique, remain unclear.

Gait variability seen in Parkinson's Disorders arise due to cortical changes induced by pathophysiology of the disease process. Gait rehabilitation is focused to harness the adapted connections involved actively to control these variations during the disease progression. Gait variabilities seen are attributed to the defective inputs from the Basal Ganglia. However, there is altered activation of other cortical areas that support the deficient control to bring about a movement and maintain some functional mobility.

Non-invasive cerebellar stimulation is the application of non-invasive neurostimulation techniques on the cerebellum to modify its electrical activity. Techniques such as transcranial magnetic stimulation (TMS) or transcranial direct current stimulation (tDCS) can be used. The cerebellum is a high potential target for neuromodulation of neurological and psychiatric disorders due to the high density of neurons in its superficial layer, its electrical properties, and its participation in numerous closed-loop circuits involved in motor, cognitive, and emotional functions.

Valeria Gazzola is an Italian neuroscientist, associate professor at the Faculty of Social and Behavioral Sciences at the University of Amsterdam (UvA) and member of the Young Academy of Europe. She is also a tenured department head at the Netherlands Institute for Neuroscience (NIN) in Amsterdam, where she leads her own research group and the Social Brain Lab together with neuroscientist Christian Keysers. She is a specialist in the neural basis of empathy and embodied cognition: Her research focusses on how the brain makes individuals sensitive to the actions and emotions of others and how this affects decision-making.

<span class="mw-page-title-main">Alexander T. Sack</span> German neuroscientist and cognitive psychologist

Alexander T. Sack is a German neuroscientist and cognitive psychologist. He is currently appointed as a full professor and chair of applied cognitive neuroscience at the Faculty of Psychology and Neuroscience at Maastricht University. He is also co-founder and board member of the Dutch-Flemish Brain Stimulation Foundation, director of the International Clinical TMS Certification Course, co-director of the Center for Integrative Neuroscience (CIN) and the Scientific Director of the Transcranial Brain Stimulation Policlinic at Maastricht University Medical Centre.

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