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Signal analysis to extract information from electroencephalography (EEG) data
EEG analysis is exploiting mathematical signal analysis methods and computer technology to extract information from electroencephalography (EEG) signals
EEG_analysis
Electrophysiological method to record electrical activity of the brain
interpretation of EEG recordings is performed by visual inspection of the tracing, which is the standard method. Quantitative EEG analysis may be used as
Electroencephalography
Signal processing computational method
tomatoes removing artifacts, such as eye blinks, from EEG data. predicting decision-making using EEG analysis of changes in gene expression over time in single
Independent component analysis
Independent_component_analysis
Type of biofeedback
subsequent studies, Berger analyzed EEGs qualitatively, but in 1932, G. Dietsch applied Fourier analysis to seven EEG records and later became the first
Neurofeedback
Numerical analysis of EEG data
Quantitative electroencephalography (qEEG or QEEG) is a field concerned with the numerical analysis of electroencephalography (EEG) data and associated behavioral
Quantitative electroencephalography
Quantitative_electroencephalography
Desire to treat cute things aggressively
animals. Higher ratings were given after viewing baby animals and the EEG analysis found in the N200 component, emotional responses peaked around 200 ms
Cute_aggression
Neurological problem in dogs
Accatino; S, Cizinauskas; A, Jaggy (2003). "Bit-mapped quantitative EEG analysis in a tiger (Tiger felis) with partial seizures: a case report". Functional
Rage_syndrome
Brainwaves, repetitive patterns of neural activity in the central nervous system
waking EEG as well as slow waves and spindles in the sleep EEG. Successful EEG analysis algorithms were based on such models. Several other EEG components
Neural_oscillation
toolbox for magnetoencephalography (MEG) and electroencephalography (EEG) analysis. It is developed at the Donders Institute for Brain, Cognition and Behaviour
FieldTrip
Vivid and convincing dream about awakening from sleep
awakenings different from REM sleep and from lucid REM sleep? A spectral EEG analysis". Journal of Clinical Sleep Medicine. 17 (4): 719–727. doi:10.5664/jcsm
False_awakening
Medical diagnostic method
known as prenatal EEG includes any recording of electrical fluctuations arising from the brain of a fetus. Doctors and scientists use EEGs to detect and
Fetal_EEG
Indian electrical engineer (born 1979)
Das (20–22 February 2025). "Neurological Responses to Meditation with EEG Analysis Using Novel Empirical Fourier-Bessel Decomposition Approach". Proceedings
Ram_Bilas_Pachori
Medical symptom
In a meta-analysis [32], the investigators summarized EEG studies that show elevated fast activity and reduced delta activity in the EEG during NREM
Non-restorative_sleep
thought". Microstate estimation and analysis was originally done using alpha band activity, though broader bandwidth EEG bands are now typically used. The
EEG_microstates
Connection between brain and computer
the EEG inverse problem and then used the resulting virtual EEG for BCI tasks. Well-controlled studies suggested the merits of such a source analysis-based
Brain–computer_interface
Technology for monitoring anesthesia
Fourier analysis), and there is a tendency for signal correlation from different parts of the cortex to become more random. As with other types of EEG analysis
Bispectral_index
underlying sources that cannot be measured directly. For instance, in EEG analysis, the electrodes on the scalp record the activity of a large number of
Stationary_subspace_analysis
Statistical distribution for dependence between random variables
Hisashi; Kuramoto, Haruka; Sunada, Yusuke; Kikkawa, Sho (August 2007). EEG Analysis in Wakefulness Maintenance State against Sleepiness by Instantaneous
Copula_(statistics)
Software
EEGLAB (MatLab) NeuroKit (Python) Gramfort, Alexandre (2013). "MEG and EEG data analysis with MNE-Python". Frontiers in Neuroscience. 7: 267. doi:10.3389/fnins
MNE-Python
Applied mathematician and computational biologist
differential equations, predictive medicine, electroencephalography (EEG) analysis, and modeling organelles in cells. His contributions also extend to
David_Holcman
Surgical removal of the amygdala
average of 6 years using objective analysis such as psychiatric interviews, neuropsychological tests and EEG analysis and found no indication of worsening
Amygdalotomy
Period of symptoms due to excessive or synchronous neuronal brain activity
electroencephalogram (EEG) records electrical activity in the brain and can help support a diagnosis of epilepsy. Interictal EEG (which can be observed
Seizure
Professor
toolbox for electroencephalography (EEG) analysis, EEGLAB. He has been acknowledged for his contribution to the field of EEG research by being awarded a Bettencourt-Schueller
Arnaud_Delorme
Inverse problem related to neuroscience
The inverse recovery in EEG is a Calderón-type inverse problem with the goal of recovering source terms and/or conductivity in layers of the human head
Inverse_recovery_in_EEG
Array of antennas creating a steerable beam
ISBN 978-0-07-054004-0. Shanbao Tong and Nitish Vyomesh Thakor (2009). Quantitative EEG analysis methods and clinical applications. Artech House. p. 53. ISBN 978-1-59693-204-3
Phased_array
Concept in information theory
Statistics and Probability 1960. pp. 547–561. Rosso, O. A. (2006). "EEG analysis using wavelet-based information tools". Journal of Neuroscience Methods
Rényi_entropy
Series of German laws
The Renewable Energy Sources Act or EEG (German: Erneuerbare-Energien-Gesetz) is a series of German laws that originally provided a feed-in tariff (FIT)
German Renewable Energy Sources Act
German_Renewable_Energy_Sources_Act
functional tasks. Initial applications of spectral analysis for finding the relationship between the EEG recordings from different regions of scalp dates
Corticocortical_coherence
Statistical indicators in signal processing
in the analysis of electroencephalography signals for feature extraction. The parameters are normalised slope descriptors (NSDs) used in EEG. Moreover
Hjorth_parameters
Narcotic effects of respiratory nitrogen
hyperbaric oxygen cause narcosis or hyperexcitability? A quantitative EEG analysis". Physiological Reports. 10 (14) e15386. doi:10.14814/phy2.15386. PMC 9300958
Nitrogen_narcosis
Sequence of data points over time
3390/electronics12051103. Gutierrez, D.; Salazar-Varas, R. (August 2011). "EEG signal classification using time-varying autoregressive models and common
Time_series
Consequences of not getting enough sleep
time tests. The results of these tests were analyzed using quantitative EEG analysis. The results indicate that the frontal regions of the brain are first
Effects of sleep deprivation on cognitive performance
Effects_of_sleep_deprivation_on_cognitive_performance
Vehicle safety system
mapping of EEG information to a useful measurement is required for accurate fatigue monitoring in an operating environment. Although EEG analysis is well
Fatigue_detection_software
Neural oscillatory pattern
using various electrophysiological methods, such as electroencephalogram (EEG), recorded either from inside the brain or from electrodes attached to the
Theta_wave
American science documentary television series
(iBrain inventor and founder of Neurovigil, a company that does innovative EEG analysis), Jack Gallant is Chancellor's Professor of Psychology at the University
Through_the_Wormhole
designed for very specific applications (for example, in ECG research and EEG analysis). The original specification included a binary header, and used an event
General Data Format for Biomedical Signals
General_Data_Format_for_Biomedical_Signals
Waveform seen during stage 2 NREM sleep
seen on an electroencephalogram (EEG). It occurs during stage 2 NREM sleep. It is the "largest event in healthy human EEG". They are more frequent in the
K-complex
Electroencephalography (EEG) is the science of recording the spontaneous rhythmic electrical activity of a living brain through electrodes on the scalp
Pharmaco-electroencephalography
Pharmaco-electroencephalography
Gaining awareness of biological processes
electroencephalograph (EEG) measures the electrical activation of the brain from scalp sites located over the human cortex. The EEG shows the amplitude of
Biofeedback
Type of medical monitoring during surgery
the use of electrophysiological methods such as electroencephalography (EEG), electromyography (EMG), and evoked potentials to monitor the functional
Intraoperative neurophysiological monitoring
Intraoperative_neurophysiological_monitoring
American education company
contributes to neuromodulation-focused instruction. The curriculum covers EEG analysis, neurofeedback preparation, event-related potentials, and related clinical
School_of_Neurotherapy
Genetic disorder caused by a mutation of chromosome 15
2017). "Delta rhythmicity is a reliable EEG biomarker in Angelman syndrome: a parallel mouse and human analysis". Journal of Neurodevelopmental Disorders
Angelman_syndrome
Group of neurological disorders causing seizures
Canady B, Arnemann K, et al. (July 2009). "Meta-analysis of EEG biofeedback in treating epilepsy". Clinical EEG and Neuroscience. 40 (3): 173–179. doi:10
Epilepsy
Learning and subsequent prediction of electrical activity
Colorado Springs. Intracortical encephalogram signal analysis has two components: 1) an intracortical EEG multicontact electrode (ICE) that inserted through
Intracortical encephalogram signal analysis
Intracortical_encephalogram_signal_analysis
Statistical proof by contradiction technique
Andreas Galka (2000). Topics in Nonlinear Time Series Analysis: with Implications for EEG Analysis. River Edge, N.J.: World Scientific. pp. 222–223.
Surrogate_data_testing
Neural oscillation in the 25–140Hz range
component analysis or other techniques based on spatial filtering, have been proposed to reduce the presence of EMG artifacts. In at least some EEG textbooks
Gamma_wave
Techniques and methods in signal processing
electroencephalography (EEG), electrocardiogram (ECG) or otoacoustic emissions (OAEs). Early work in time–frequency analysis can be seen in the Haar wavelets
Time–frequency_analysis
Temporary episode of sleep or drowsiness
microsleeps are often classified as a shift in electroencephalography (EEG) during which 4–7 Hz (theta wave) activity replaces the waking 8–13 Hz (alpha
Microsleep
MRI procedure that measures brain activity by detecting associated changes in blood flow
for the EEG signal from varying blood flow triggered by the fMRI gradient field, and the EEG signal from the static field. For details, see EEG vs fMRI
Functional magnetic resonance imaging
Functional_magnetic_resonance_imaging
Type of electrophysiological monitoring
Electrocorticography (ECoG), a type of intracranial electroencephalography (iEEG), is a type of electrophysiological monitoring that uses electrodes placed
Electrocorticography
Mapping brain activity by recording magnetic fields produced by currents in the brain
measure MEG signals. This time the signals were almost as clear as those of EEG. This stimulated the interest of physicists who had been looking for uses
Magnetoencephalography
Signal representation
ISBN 978-0-07-054004-0. Shanbao Tong and Nitish Vyomesh Thakor (2009). Quantitative EEG analysis methods and clinical applications. Artech House. p. 53. ISBN 978-1-59693-204-3
Frequency_domain
Process to choose a course of action
show significantly greater left prefrontal cortex activity as measured by EEG than do less defensive individuals. Premature termination of search for evidence:
Decision-making
EEG-fMRI (short for EEG-correlated fMRI or electroencephalography-correlated functional magnetic resonance imaging) is a multimodal neuroimaging technique
Electroencephalography functional magnetic resonance imaging
Electroencephalography_functional_magnetic_resonance_imaging
Topics referred to by the same term
toolbox for magnetoencephalography (MEG) and electroencephalography (EEG) analysis This disambiguation page lists articles associated with the title Field
Field_trip_(disambiguation)
Mixing and filling cylinders with breathing gases for use when scuba diving
hyperbaric oxygen cause narcosis or hyperexcitability? A quantitative EEG analysis". Physiological Reports. 10 (14) e15386. doi:10.14814/phy2.15386. PMC 9300958
Gas_blending_for_scuba_diving
Study of mental functions and behaviors
tool for relating mental and neural activity is the electroencephalogram (EEG). This technique uses electrodes with amplifiers on a person's scalp to measure
Psychology
Concept in Fourier analysis
(pitch) speech analysis and recognition medical applications in analysis of electroencephalogram (EEG) and brain waves machine vibration analysis based on harmonic
Cepstrum
methods. When multivariate robust measures of connectivity are applied for EEG analysis a clear picture of functional connectivity emerges. Resting State fMRI
Brain_connectivity_estimators
Neural oscillations in the frequency range of 8–12 Hz
invented the EEG in 1924. Alpha waves are one type of brain waves detected by electrophysiological methods, e.g., electroencephalography (EEG) or magnetoencephalography
Alpha_wave
Rare form of childhood-onset epilepsy
seizure, cognitive dysfunction, and slow spike waves on electroencephalogram (EEG), which are very abnormal. Typically, it presents in children aged 3–5 years
Lennox–Gastaut_syndrome
Statistic used for nonlinear interactions
patterns and tides on Earth. A form of bispectral analysis called the bispectral index is applied to EEG waveforms to monitor depth of anesthesia. Biphase
Bispectrum
High amplitude low frequency brain wave
infants. Analysis of the waking EEG of a newborn infant indicates that delta wave activity is predominant in that age, and still appears in a waking EEG of
Delta_wave
Brain stimulation using magnetic fields
electroencephalography (EEG) to assess functional connectivity. Low-profile electrodes have been developed for concurrent TMS–EEG in order to reduce mechanical
Transcranial magnetic stimulation
Transcranial_magnetic_stimulation
Method for comparing the narcotic effects of a mixed diving gas with air
activity when measured with an EEG. A functional connectivity metric based on the so-called mutual information analysis has been developed, and summarized
Equivalent_narcotic_depth
Vertebrate brain region
electrical activity as measured by an electroencephalogram (EEG). These modes are named after the EEG patterns associated with them: theta and large irregular
Hippocampus
Phase of sleep characterized by random and rapid eye movements
rhythm in the hippocampus and 40–60 Hz gamma waves in the cortex; patterns of EEG activity similar to these rhythms are also observed during wakefulness. The
Rapid_eye_movement_sleep
Brain activity sensing headband
brain activity via 4 electroencephalography (EEG) sensors. An accompanying mobile app converts the EEG signal into audio feedback that is fed to the
Muse_(headband)
Chemical compound
Krapivin SV, Voronina TA (1995). "[Comparative quantitative pharmacological-EEG analysis of the effects of psychostimulants]". Vestnik Rossiiskoi Akademii Meditsinskikh
Adapromine
Theory of brain function
model of predictive coding.[according to whom?] Electroencephalography (EEG) and event-related potential (ERP) research have been widely used to investigate
Predictive_coding
Abnormal EEG pattern
Burst suppression is an electroencephalography (EEG) pattern that is characterized by periods of high-voltage electrical activity alternating with periods
Burst_suppression
Saha, Anuradha; Konar, Amit; Nagar, Atulya K. (December 21, 2017). "EEG Analysis for Cognitive Failure Detection in Driving Using Type-2 Fuzzy Classifiers"
Atulya_Nagar
Function for integral Fourier-like transform
analysis, density-matrix localisation, seismology, optics, turbulence and quantum mechanics. This change has also occurred in image processing, EEG,
Wavelet
MATLAB toolbox for neurophysiological biomarkers
than 1000 users. The NBT toolbox provides unique features for analysis of resting-state EEG or MEG recordings. NBT offers a pipeline from data storage to
Neurophysiological Biomarker Toolbox
Neurophysiological_Biomarker_Toolbox
Measure of the level of consciousness
electrical activity is recorded with electroencephalography (EEG). The recorded spatiotemporal EEG response is then binarized and compressed using a lossless
Perturbational Complexity Index
Perturbational_Complexity_Index
Set of techniques to measure and visualize aspects of the nervous system
dollars. EEG is a much more widely used method to achieve such temporal resolution as EEG systems cost much less than MEG systems. A disadvantage of EEG and
Neuroimaging
Graph of a person's sleep
the recordings of the brain wave activity from an electroencephalogram (EEG) during a period of sleep. It allows the different stages of sleep: rapid
Hypnogram
Intense physical sensation of sexual release
areas of the brain. EEG tracings from volunteers during orgasm were first obtained by Mosovich and Tallaferro in 1954, who recorded EEG changes resembling
Orgasm
Beisteiner also provided the pre-operative analysis of patients scheduled for surgery (with fMRI, MEG and DC-EEG). With 14 early blind subjects the study
Ludwig Boltzmann Institute for Functional Brain Topography
Ludwig_Boltzmann_Institute_for_Functional_Brain_Topography
American psychologist
Quantitative Social Theoretical Applied psychology Anomalistic Applied behavior analysis Art Assessment Aviation Biography of famous people Clinical Coaching Color
Richard_Davidson
Domain of behavior analysis
behavior analysis is a domain of behavior analysis, the others being radical behaviorism, experimental analysis of behavior and applied behavior analysis. The
Professional practice of behavior analysis
Professional_practice_of_behavior_analysis
Brain responses phase-locked to periodic visual stimulation
frequencies). SSVEPs are most commonly measured with electroencephalography (EEG), owing to their high signal-to-noise ratio and robust frequency specificity
Steady state visually evoked potential
Steady_state_visually_evoked_potential
Symptom characterized by persistent sleepiness
YJ, Jung TP (December 2005). "EEG-based drowsiness estimation for safety driving using independent component analysis". IEEE Transactions on Circuits
Excessive_daytime_sleepiness
Hypnotic medication
the effectiveness of the drugs on sleep. It causes similar alterations on EEG readings and sleep architecture as benzodiazepines and causes disturbances
Zopiclone
Assessment of statements to reveal deceit
trustworthiness ratings, the importance of which will be discussed in the EEG section. This, along with other studies leads some to purport that because
Lie_detection
Mathematical technique in data science
Elzbieta; Marzetti, Laura; Assenza, Giovanni (2014). "Fractal Dimension of EEG Activity Senses Neuronal Impairment in Acute Stroke". PLOS ONE. 9 (6): 3929–3941
Fractal_analysis
Psychiatric behavioural syndrome
seizure activity seen on electroencephalogram (EEG). Catatonia, on the other hand, is associated with normal EEG or diffuse slowing. Delirium is characterized
Catatonia
Statistical modeling framework
imaging (fMRI), magnetoencephalography (MEG) or electroencephalography (EEG). Parameters in these models quantify the directed influences or effective
Dynamic_causal_modeling
Benzodiazepine sedative
skills. EEG tests show more drowsiness and light sleep 18 hours after nitrazepam intake, more so than amylobarbitone. Fast activity was recorded via EEG 18
Nitrazepam
Type of functional magnetic resonance imaging
combined and complemented with other measures of brain physiology such as EEG, NIRS, and functional ultrasound. Arterial spin labeling fMRI can be used
Resting_state_fMRI
Science of measuring the brain's electrical activity
quantitative EEG that provides a precise, reproducible estimate of the deviation of an individual record from normal. This computer analysis makes it possible
Neurometrics
Brain response that is the direct result of a specific sensory, cognitive, or motor event
brain functioning. ERPs are measured by means of electroencephalography (EEG). The magnetoencephalography (MEG) equivalent of ERP is the ERF, or event-related
Event-related_potential
Relaxation technique
of neurophysiological investigations addressing this topic; however, one EEG study from 1963 suggested that the decrease in afferent stimulation induces
Autogenic_training
Chronic focal seizure disorder
psychiatric comorbidities may occur. Diagnosis relies on electroencephalographic (EEG) and neuroimaging studies. Anticonvulsant medications, epilepsy surgery,
Temporal_lobe_epilepsy
Separation of a set of source signals from a set of mixed signals
help remove undesired artifacts from the signal. In electroencephalogram (EEG) and magnetoencephalography (MEG), the interference from muscle activity
Signal_separation
American sleeplessness world record holder
Sleeping In, David Goldenberg, Jelq Magazine, 31 May 2006 Psychiatric and EEG observations on a case of prolonged (264 hours) wakefulness, G. Gulevich
Randy Gardner sleep deprivation experiment
Randy_Gardner_sleep_deprivation_experiment
Intravenous medication used in anesthesia
role in the physiologic control of sleep, pain processing and emesis. An EEG study on patients undergoing general anesthesia with propofol found that
Propofol
Neuroscience and linguistics-related studies
(such as PET and fMRI) and time-sensitive electrophysiological techniques (EEG and MEG), which can highlight patterns of brain activation as people engage
Neurolinguistics
Type of abnormal brain wave
(IRDA) is a type of brain wave abnormality found in electroencephalograms (EEG). It can be classified based on the area of brain it originates from: frontal
Intermittent rhythmic delta activity
Intermittent_rhythmic_delta_activity
Psychological phenomenon
investigation through signal processing and detection within electroencephalograph (EEG) data as well as data obtained using alternative non-invasive, brain–computer
Imagined_speech
EEG ANALYSIS
EEG ANALYSIS
Girl/Female
Chinese, Indian, Traditional
Silkworm Egg
Girl/Female
American, Australian, British, Christian, Danish, Dutch, English, French, German, Greek, Indian, Irish, Latin, Welsh
Love; Pearl; Great and Mighty; Diminutive of Margaret; Rain
Girl/Female
Latin
Egg.
Girl/Female
Greek Persian English
Pearl.
Boy/Male
Australian, British, Christian, English
Mighty Counsellor-ruler; Form of Reynold; Diminutive of Reginald; Wise Ruler
Boy/Male
Indian, Sanskrit
Egg; Of an Egg
Boy/Male
Indian
Noble, Prince
Girl/Female
Gaelic
Peg.
Boy/Male
Indian, Sanskrit
Direction; Sky
Female
English
Pet form of English Margaret, MEG means "pearl."
Girl/Female
Australian, British, Christian, Dutch, English, French, German, Greek, Irish, Latin
Pearl; Diminutive; Diminutive of Margaret which Developed from Rhyming with Meg
Male
African
an egg.
Girl/Female
Greek American Persian
Pearl.
Female
English
Short form of English Peggy, PEG means "pearl."
Boy/Male
Indian, Marathi
Egg Plant
Boy/Male
Muslim
Noble, Prince
Male
English
Short form of English Reginald, REG means "wise ruler."
Boy/Male
Assamese, Indian
Egg Plant
Boy/Male
English
Mighty counselor-ruler. Form of Reynold.
Boy/Male
Arabic, Muslim
Honorific Title i.e. Lord or Master
EEG ANALYSIS
EEG ANALYSIS
Boy/Male
Muslim
Pure, Chaste
Girl/Female
Muslim
Intelligent
Surname or Lastname
English (Midlands)
English (Midlands) : possibly a topographical name from Middle English tufte, tuffe ‘clump of trees or bushes’. This is an element of minor place names and field names in various counties.Norwegian : habitational name from any of several farmsteads so named, from Old Norse tupt ‘site’, ‘lot’.Possibly an altered spelling of South German Duft, from a topographic name meaning ‘swamp’, ‘moor’.
Boy/Male
Bengali, Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Oriya, Sanskrit, Telugu
The Moon; A Shining Moon; Night of Twilight
Girl/Female
Arabic Muslim
Virgin.
Girl/Female
Indian, Punjabi, Sikh
Full with Love
Male
Irish
Variant spelling of Irish Gaelic Cathaoir, CAHIR means "warrior."
Surname or Lastname
English
English : variant of Stokes.
Girl/Female
English Irish
Adventurous.
Girl/Female
Tamil
Parajika | பராஜிகா
A Raagini
EEG ANALYSIS
EEG ANALYSIS
EEG ANALYSIS
EEG ANALYSIS
EEG ANALYSIS
v. i.
To work diligently, as one who pegs shoes; -- usually with on, at, or away; as, to peg away at a task.
a.
Resembling an egg in form; ovoid.
n.
A small sandglass, running about three minutes, for marking time in boiling eggs; also, a small glass for holding an egg, at table.
v. t.
To use as a leg, with it as object
n.
A cup used for holding an egg, at table.
n.
A small, pointed piece of wood, used in fastening boards together, in attaching the soles of boots or shoes, etc.; as, a shoe peg.
v. t.
To put pegs into; to fasten the parts of with pegs; as, to peg shoes; to confine with pegs; to restrict or limit closely.
n.
A step; a degree; esp. in the slang phrase "To take one down peg."
n.
Anything resembling an egg in form.
n.
An elongated fish of many genera and species. The common eels of Europe and America belong to the genus Anguilla. The electrical eel is a species of Gymnotus. The so called vinegar eel is a minute nematode worm. See Conger eel, Electric eel, and Gymnotus.
n.
A bow, esp. in the phrase to make a leg; probably from drawing the leg backward in bowing.
v. t.
To make petition to; to entreat; as, to beg a person to grant a favor.
n.
The part of any article of clothing which covers the leg; as, the leg of a stocking or of a pair of trousers.
n.
That which resembles a leg in form or use; especially, any long and slender support on which any object rests; as, the leg of a table; the leg of a pair of compasses or dividers.
v. t.
To score with a peg, as points in the game; as, she pegged twelwe points.
n.
A wooden pin, or nail, on which to hang things, as coats, etc. Hence, colloquially and figuratively: A support; a reason; a pretext; as, a peg to hang a claim upon.
n.
An extension of the boiler downward, in the form of a narrow space between vertical plates, sometimes nearly surrounding the furnace and ash pit, and serving to support the boiler; -- called also water leg.