NLINKN1 Chip+PRIME.StudySYNCRStentrode+$200M.SeriesDPRECNLayer 7+FDA.BrkthruPARAMArgo+$20M.SeriesBBLKRKNeuroport+200.ImplantsEMTIVMN8+$45M.SeriesBKRNLFlux+Non-invasiveNRBLEHalo+Consumer.BCINEURONeuroPace+RNS.SystemCOGNICognixion+ALS.TrialFUND.YTD2026$2.8B.SectorTRIALSActive50+.ClinTrialsIMPLNTSHumans~100.Intracrtnl
BCI Glossary
The definitive reference for brain-computer interface terminology — neuroscience, hardware, signal processing, decoding, and regulatory.
94 terms defined · 16 categories
ApplicationsClinical conditionsCore conceptsDevicesEmerging technologyImplant typesMaterials scienceNeuroanatomyNeuroscienceRecording modalitiesRegulatorySafetySignal processingSignal typesSystem architectureTherapeutic modalities
Applications
Affective BCIA brain-computer interface that detects, classifies, or modulates emotional states from neural signals, enabling technology that responds to the user's affective condition.→
Cognitive BCIA brain-computer interface that decodes or modulates higher-order cognitive processes such as attention, memory, decision-making, or executive function, rather than motor or sensory signals.→
Communication BCIA brain-computer interface designed primarily to restore the ability to communicate for people who have lost speech and motor function, using neural signals to generate text, select symbols, or produce synthesized speech.→
Cursor ControlThe foundational BCI application in which decoded neural signals drive the movement of a computer cursor on a screen, enabling point-and-click interaction for communication and computer access.→
Motor BCIA brain-computer interface that decodes intended movements from motor cortex activity to control external devices such as computer cursors, robotic arms, or powered wheelchairs.→
Prosthetic ControlThe use of brain-computer interface signals to control robotic or powered prosthetic limbs, enabling people with paralysis or amputation to perform reaching, grasping, and manipulation tasks through neural commands.→
Sensory BCIA brain-computer interface that delivers artificial sensory information to the brain via electrical stimulation, restoring or creating sensations of touch, vision, hearing, or proprioception.→
Speech BCIA brain-computer interface that decodes intended speech from neural activity in speech-related motor cortex, producing text or synthesized voice output for people who have lost the ability to speak.→
Clinical conditions
Core concepts
Brain-Computer InterfaceA direct communication pathway between the brain and an external device, bypassing the normal neuromuscular pathway.→
Brain-Machine InterfaceAn alternative term for brain-computer interface, emphasizing the direct connection between neural activity and mechanical or robotic devices such as prosthetic limbs.→
Neural InterfaceAny device or system that creates a direct interaction between electronic components and the nervous system, enabling recording of neural activity, delivery of electrical stimulation, or both.→
NeuroprostheticsDevices that replace or restore lost neural function by interfacing with the nervous system, encompassing both motor prosthetics (restoring movement or communication) and sensory prosthetics (restoring vision, hearing, or touch).→
NeurotechnologyThe broad category of technologies that interface with, monitor, or modulate the nervous system, encompassing brain-computer interfaces, neuromodulation devices, neuroimaging systems, and neuropharmacological tools.→
Devices
AmplifierAn electronic circuit that increases the amplitude of weak neural signals (microvolts to millivolts) to levels suitable for digitization and processing, a critical component in every neural recording system.→
Analog-to-Digital Converter (ADC)An electronic component that converts continuous analog neural voltage signals into discrete digital values for computational processing, storage, and transmission.→
ARC-IMONWARD Medical's implantable epidural spinal cord stimulation system designed to restore movement after spinal cord injury by delivering targeted electrical stimulation to spinal circuits, controllable by a brain-computer interface for a brain-spine digital bridge.→
ConnexusParadromics' high-bandwidth intracortical BCI system featuring thousands of microwire electrodes and a hermetically sealed wireless implant designed for clinical-grade speech and motor decoding.→
Depth ElectrodeA probe inserted deep into brain tissue to record from or stimulate subcortical structures, widely used in epilepsy monitoring (stereo-EEG) and deep brain stimulation.→
Dry ElectrodeAn EEG electrode that makes electrical contact with the scalp without conductive gel or saline, enabling faster setup and improved user comfort at the cost of higher contact impedance and lower signal quality.→
Electrode ArrayA multi-electrode device used to simultaneously record from or stimulate multiple sites in neural tissue, providing spatial coverage of neural activity across brain regions.→
Layer 7 Cortical InterfacePrecision Neuroscience's 1,024-channel thin-film ECoG array — 20 micrometers thick — designed to conform to the cortical surface for high-density neural recording without penetrating brain tissue.→
Michigan ProbeA silicon-based neural probe with multiple electrode sites distributed along a thin shank, enabling recording at multiple depths within a single insertion track through cortical tissue.→
Microelectrode ArrayA device consisting of multiple microscale electrodes arranged in a defined geometry for simultaneously recording from or stimulating many sites in neural tissue.→
N1 ImplantNeuralink's fully implanted wireless brain-computer interface device featuring 1,024 electrodes on 64 flexible polymer threads, an integrated ASIC for signal processing, and inductive wireless charging and data transmission.→
NeuroPortBlackrock Neurotech's neural recording and stimulation platform — the commercial system that includes the Utah Array, CerePort connector, and Cerebus/NeuroPort signal processors used in the majority of human intracortical BCI research.→
RNS SystemThe NeuroPace Responsive Neurostimulation System — an FDA-approved closed-loop neurostimulator that continuously monitors brain activity via implanted ECoG electrodes and delivers targeted electrical stimulation to disrupt seizures at their onset.→
StentrodeSynchron's endovascular BCI device — a stent-mounted electrode array delivered via catheter through blood vessels to sit adjacent to the motor cortex, recording neural signals without open brain surgery.→
Subdural GridA sheet of electrodes placed beneath the dura mater directly on the cortical surface, used clinically for epilepsy monitoring and experimentally for ECoG-based BCI research.→
Utah ArrayA 96-electrode silicon intracortical recording array arranged in a 10x10 grid, the most widely used implanted BCI device in human research.→
Wet ElectrodeA traditional EEG electrode that uses conductive gel, paste, or saline to establish a low-impedance electrical connection between the electrode surface and the scalp.→
Emerging technology
Flexible ElectronicsElectronic circuits and devices fabricated on soft, bendable substrates that can conform to the curved, compliant surface of the brain, reducing mechanical mismatch and improving chronic biocompatibility of neural implants.→
Graphene ElectrodeA neural electrode fabricated from graphene — a single-atom-thick sheet of carbon — offering unique properties including optical transparency, mechanical flexibility, low impedance, and broad-bandwidth recording capability.→
High-Bandwidth BCIA brain-computer interface system with sufficient electrode count, signal quality, and decoding capability to transfer information at rates approaching or exceeding natural human communication and motor control speeds.→
MagnetogeneticsAn emerging neuroscience technique that aims to control neural activity using magnetic fields acting on genetically encoded magnetic-field-sensitive proteins, potentially enabling non-invasive, deep-brain neural modulation.→
Neural DustA proposed concept for ultra-miniaturized, wireless neural sensors — each smaller than a grain of sand — that could be distributed throughout the brain to record from many sites without wired connections.→
OptogeneticsA neuroscience technique that uses genetically encoded light-sensitive proteins (opsins) to control the activity of specific neuron types with millisecond precision using light, offering cell-type-specific neural modulation not possible with electrical stimulation.→
SonogeneticsAn emerging neuroscience technique that uses genetically encoded ultrasound-sensitive proteins to control neural activity with focused ultrasound, potentially enabling non-invasive, deep-brain neuromodulation.→
Wireless BCIA brain-computer interface system in which neural data is transmitted wirelessly from the implanted device to an external processor, eliminating the need for percutaneous cables and enabling everyday use outside laboratory settings.→
Implant types
EndovascularA minimally invasive approach to neural recording or stimulation in which electrodes are delivered through blood vessels (typically the jugular vein) to sit adjacent to brain tissue, avoiding open brain surgery.→
EpiduralReferring to the space or placement above the dura mater — the outermost membrane covering the brain — where electrodes can record neural signals without penetrating the dura or contacting brain tissue directly.→
PercutaneousReferring to a connection or device component that passes through the skin, such as the wired pedestal connector on the Utah Array that exits the skull to connect to external recording equipment.→
TranscranialReferring to techniques that deliver energy (electrical current, magnetic fields, ultrasound) through the intact skull to stimulate or modulate brain activity without surgical intervention.→
Materials science
Neuroanatomy
Broca's AreaA region in the left inferior frontal gyrus of the brain critical for speech production, language processing, and motor planning of articulation, and a key recording target for speech BCI systems.→
Dorsal Premotor CortexA frontal cortical region anterior to primary motor cortex that encodes movement planning, target selection, and sensorimotor transformations, providing preparatory signals used in some BCI decoders.→
Motor CortexThe region of the cerebral cortex responsible for planning, controlling, and executing voluntary movements. The primary recording target for motor BCIs due to its rich representation of movement intention.→
Primary Motor Cortex (M1)The principal cortical region (precentral gyrus, Brodmann area 4) responsible for generating the neural commands that drive voluntary movements, and the most common recording target for intracortical motor BCIs.→
Somatosensory CortexThe region of cerebral cortex (postcentral gyrus) that processes tactile, proprioceptive, and pain information from the body, and the primary target for sensory BCI stimulation to restore artificial touch sensation.→
Supplementary Motor AreaA cortical region on the medial surface of the frontal lobe involved in movement planning, sequencing, and initiation, providing higher-level motor commands that complement primary motor cortex activity.→
Wernicke's AreaA region in the posterior superior temporal gyrus of the brain involved in language comprehension and semantic processing, forming part of the cortical language network alongside Broca's area.→
Neuroscience
Neural PlasticityThe brain's ability to reorganize its structure, function, and connections in response to experience, learning, injury, or ongoing interaction with a BCI device.→
NeuroplasticityThe brain's capacity to reorganize neural circuits in response to experience, learning, or injury. Synonym for neural plasticity.→
Recording modalities
ECoGAbbreviation for electrocorticography — the recording of electrical brain signals from electrode arrays placed on the cortical surface.→
ElectrocorticographyRecording of electrical brain activity using electrode arrays placed directly on the cortical surface (subdurally or epidurally), providing higher signal quality than scalp EEG without penetrating brain tissue.→
Electroencephalography (EEG)A non-invasive method for recording electrical brain activity from electrodes placed on the scalp, widely used in clinical neurology, sleep medicine, and non-invasive BCI systems.→
Intracortical RecordingNeural recording performed by electrodes implanted directly within brain tissue, enabling detection of individual neuron action potentials.→
Single-Unit RecordingThe electrophysiological technique of isolating and recording the action potentials (spikes) of individual neurons using intracortical microelectrodes.→
Regulatory
Breakthrough Device DesignationAn FDA program that provides expedited development and review of medical devices intended to treat or diagnose serious conditions where the device offers more effective treatment or diagnosis than available alternatives.→
Compassionate UseAn FDA pathway (also called Expanded Access) that allows patients with serious or life-threatening conditions to access investigational medical devices outside of clinical trials when no comparable alternatives exist.→
FDA 510(k)A premarket regulatory submission demonstrating that a new medical device is substantially equivalent to a legally marketed predicate device, allowing it to be cleared for commercial distribution without full clinical trials.→
FDA PMAPremarket Approval — the most rigorous FDA regulatory pathway for high-risk (Class III) medical devices, requiring extensive clinical trial data demonstrating safety and effectiveness before commercial marketing is permitted.→
First-in-HumanThe initial clinical study in which a new medical device or therapy is used in a human participant for the first time, following extensive preclinical testing in animal models and bench studies.→
Humanitarian Device Exemption (HDE)An FDA approval pathway for devices intended to treat or diagnose conditions affecting fewer than 8,000 patients per year in the US, requiring demonstration of safety and probable benefit rather than full effectiveness data.→
Investigational Device ExemptionAn FDA regulatory authorization allowing a medical device to be used in clinical studies to collect safety and effectiveness data, before the device receives FDA approval or clearance.→
Pivotal TrialA definitive clinical study designed to provide the primary evidence of safety and effectiveness required for FDA premarket approval (PMA) of a medical device, typically larger and more rigorously controlled than a feasibility study.→
Safety
Device LongevityThe operational lifespan of an implanted BCI device, encompassing both the durability of the hardware components and the sustained quality of neural recordings over years to decades of chronic use.→
Foreign Body ResponseThe cascade of neuroinflammatory and immune reactions triggered by the implantation of a device in brain tissue, leading to glial scarring and potential degradation of neural recording quality over time.→
Glial ScarringThe formation of a dense sheath of reactive astrocytes around an implanted neural device, creating a physical and chemical barrier between the electrode and surrounding neurons that degrades chronic recording quality.→
ImpedanceThe opposition to electrical current flow at a neural electrode interface, determined by electrode material, size, surface coating, and surrounding tissue condition — a key indicator of electrode health and recording quality.→
MRI CompatibilityThe ability of an implanted neural device to safely undergo magnetic resonance imaging without device damage, tissue heating, image artifacts, or risk to the patient.→
Signal DegradationThe gradual decline in neural recording quality over time in chronically implanted BCI devices, caused by biological (glial scarring, neuronal loss) and technical (electrode corrosion, insulation failure) factors.→
Signal processing
Dimensionality ReductionMathematical techniques that extract low-dimensional structure from high-dimensional neural population recordings, revealing the underlying neural dynamics that drive behavior and BCI control.→
Kalman FilterA recursive Bayesian estimation algorithm that tracks the probability distribution of a hidden state (e.g., intended cursor position) given noisy observations (neural signals), widely used as the core decoder in cursor-control BCIs.→
Latent Factor AnalysisA class of computational methods that infer unobserved (latent) variables driving the coordinated activity of neural populations, used to denoise neural recordings and improve BCI decoder performance.→
Neural DecodingThe process of inferring intended movements, thoughts, or commands from recorded neural signals using computational algorithms.→
Neural EncodingThe process by which the brain represents information — sensory stimuli, motor plans, memories, decisions — as patterns of neural activity, and the study of how these representations are structured.→
Real-Time ProcessingThe ability of a BCI system to acquire, decode, and act on neural signals within a time frame fast enough for the user to perceive continuous, responsive control — typically under 50 milliseconds of end-to-end latency.→
Recurrent Neural Network DecoderA deep learning decoder architecture that uses recurrent connections to model temporal dependencies in neural signals, enabling high-performance decoding of complex sequences like handwriting and speech from brain activity.→
Signal-to-Noise RatioIn neural recording, the ratio of the amplitude of a neuron's action potential waveform to the amplitude of background electrical noise, determining the clarity and usability of neural recordings.→
Spike SortingThe computational process of identifying and separating the action potentials of individual neurons from raw extracellular electrode recordings containing overlapping spikes from multiple nearby cells.→
Transformer DecoderA deep learning architecture based on self-attention mechanisms that processes neural signal sequences in parallel, achieving state-of-the-art performance in speech and motor BCI decoding tasks.→
Signal types
Event-Related Potential (ERP)A time-locked EEG voltage deflection that occurs in response to a specific sensory, cognitive, or motor event, used as a neural feature in non-invasive BCI systems.→
LFPAbbreviation for Local Field Potential. See local-field-potential for the full entry.→
Local Field PotentialA low-frequency electrical signal recorded by an intracortical or ECoG electrode that reflects the aggregate synaptic activity of a local neural population.→
Motor ImageryThe mental rehearsal of a movement without physical execution, producing measurable changes in sensorimotor cortex oscillations that can be detected by EEG or intracortical electrodes and used for BCI control.→
Multi-Unit ActivityThe aggregate spiking activity of multiple neurons detected on a single electrode, obtained by threshold-crossing detection without isolating individual neurons.→
Neural OscillationsRhythmic patterns of electrical activity in the brain, categorized by frequency bands (delta, theta, alpha, beta, gamma), that reflect coordinated neural population dynamics and serve as features for BCI decoding.→
P300An event-related potential (ERP) — a positive deflection in the EEG signal occurring approximately 300 milliseconds after a rare or task-relevant stimulus — widely used as the basis for non-invasive EEG-based BCI spelling systems.→
SSVEPSteady-State Visual Evoked Potential — a rhythmic EEG response at the exact frequency of a flickering visual stimulus, used as a high-speed, non-invasive BCI selection mechanism.→
System architecture
Bidirectional BCIA brain-computer interface capable of both reading neural signals and writing information back into the brain via electrical stimulation, enabling two-way communication between the device and the nervous system.→
Closed-Loop BCIA brain-computer interface system that both records neural signals and delivers stimulation in response, creating a bidirectional feedback loop between the device and the brain.→
Open-Loop BCIA brain-computer interface that operates in one direction only — recording neural signals and translating them into device commands without delivering stimulation or feedback to the brain.→
Therapeutic modalities