Biomedical Signal Sensing & Recording

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Abstractions about measuring physiological and electrical signals, covering bioelectric and biomagnetic recording techniques (electrocardiography, magnetoencephalography, electrocochleography, magnetogastrography), signal-processing methods for extracting weak signals (correlated double sampling, pulse compression), and reflex mechanisms like the acoustic reflex.

20 abstractions in this family — domain-specific abstractions that sit near one another in structural-signature space (k-means over structural-signature embeddings). Each is shown with its short description.

• Acoustic reflex — An involuntary, usually bilateral stapedius contraction triggered by intense sound or self-vocalization that stiffens the ossicular chain and attenuates sound transmission.
• Correlated Double Sampling — Paired reference-and-signal sampling that subtracts a shared electrical offset or noise component.
• Depolarizing Prepulse — Condition an excitable nerve with a depolarizing-polarity first pulse before a separate test pulse, with the later response dependent on pulse and electrode conditions.
• Diagnostic Percussion — A clinical examination method interpreting an elicited acoustic note from a body region as fallible evidence about underlying tissue, air, fluid, or organ boundaries.
• Electrical Capacitance Tomography — An inverse imaging method that estimates a low-resolution internal permittivity distribution from pairwise capacitance measurements made by electrodes around an object's exterior.
• Electrocardiography — The process of recording body-surface voltage differences generated by cardiac depolarization and repolarization through configured electrodes and leads to produce an electrocardiogram over time.
• Electrocochleography — A clinical and research recording technique that measures sound-evoked electrical potentials from the cochlea and auditory nerve using an electrode positioned near or at the tympanic membrane or cochlear promontory.
• Electromagnetically Induced Acoustic Noise — Audible sound radiated when electromagnetic forces or strains make a device component vibrate.
• Electroneuronography — A facial-nerve test that evokes and records compound muscle action potentials, usually comparing facial sides to estimate functional axon loss within a timing- and technique-dependent clinical context.
• Magnetic Resonance Imaging — A non-ionizing imaging modality that spatially reconstructs internal anatomy or selected physiology from magnetic-resonance signals and field-gradient localization.
• Magnetoencephalography — Recording brain-generated magnetic fields over time and inferring neural activity under source-model limits.
• Magnetogastrography — A noninvasive biomagnetic method that records weak magnetic fields generated by gastric electrical currents, typically with SQUID sensors, to produce magnetogastrograms.
• Open-Circuit Time-Constant Method — An approximate high-frequency circuit method that opens all but one capacitor, finds each selected capacitor's seen resistance with independent sources zeroed, sums the RiCi terms, and inverts the sum for a first-order corner estimate.
• Periodic lateralized epileptiform discharges — A lateralized, periodic or near-periodic EEG waveform pattern indicating focal cerebral dysfunction and elevated seizure concern, but not independently equivalent to an electrographic seizure.
• Physiological Reflex — A physiological reflex is a comparatively rapid and repeatable involuntary response in an organism, elicited by a class of stimuli and mediated through a definable receptor, afferent pathway, integrating circuitry, efferent pathway, and effector under specified organismal conditions.
• Pulse Compression — Encoding a long probe pulse and matched-filtering its return to obtain a narrower echo response without relying on a physically short transmitted pulse.
• Pulse duration — The time from a pulse's first rising crossing to its last falling crossing of a stated amplitude threshold, usually the 50% level unless another convention is specified.
• Quantal Neurotransmitter Release — Discrete chemical-synapse release of neurotransmitter packets from individual vesicles, producing elementary postsynaptic responses that can combine into a larger signal.
• Thin-film memory — Magnetic computer memory whose addressable bit sites are patterned thin ferromagnetic films coupled to drive and sense conductors.
• Vasomotor Regulation — The physiological control of blood-vessel diameter through regulated changes in vascular smooth-muscle tone.