EEG Electroencephalography Epilepsy Awareness Program Middle East Medical Information Center and Directory. History An electroencephalogram EEG is a test used to detect abnormalities related to electrical activity of the brain. Scientists first captured and recorded brain waves in dogs in 1. German physiologist and psychiatrist Hans Berger 1. EEG in 1. 92. 0. He gave the device its name and is sometimes credited with inventing the EEG, though others had performed similar experiments. EEG, QEEG Biofeedback Software with dynamic normative databases and discriminant functions and statistics and 3Dimensional Imaging with LORETA, JTFA, multivariate. Adobe After Effects Expressions there. CONTEC. Download User Manual or Service Manual. Specializing in QEEG Quantitative EEG analysis and display software, database as well as discriminant functions to help diagnose neurological disorders. Group offers several freeware programs for Win 32, including file manager, image editors, font viewer, and an MP3 database. Tobii Pro provides scientists and researchers with eye tracking devices and software for costeffective research with highly precise and reliable results. G. MOBIlab g. tecs portable biosignal acquisition and analysis system. MOBIlab is the perfect tool for recording multimodal biosignal data on a standard PC or. Cadwell offers neurodiagnostic electrodiagnostic EDX medical equipment and supplies for EMG, EEG, IONM, Sleep testing. Electroencephalography EEG is an electrophysiological monitoring method to record electrical activity of the brain. It is typically noninvasive, with the electrodes. Eeg Software Download' title='Eeg Software Download' />His work was later expanded by Edgar Douglas Adrian. In 1. 93. 4, Fisher and Lowenback first demonstrated epileptiform spikes. In 1. 93. 5 Gibbs, Davis and Lennox described interictal spike waves and the 3 cycless pattern of clinical absence seizures, which began the field of clinical electroencephalography. Subsequently, in 1. Gibbs and Jasper reported the interictal spike as the focal signature of epilepsy. The same year, the first EEG laboratory opened at Massachusetts General Hospital. Franklin Offner 1. Northwestern University developed a prototype of the EEG that incorporated a piezoelectric inkwriter called a Crystograph the whole device was typically known as the Offner Dynograph. In 1. 94. 7, The American EEG Society was founded and the first International EEG congress was held. In 1. 95. 3 Aserinsky and Kleitman describe REM sleep. Study/video/image/eegvideo_02.jpg' alt='Eeg Software Download' title='Eeg Software Download' />In the 1. William Grey Walter developed an adjunct to EEG called EEG topography, which allowed for the mapping of electrical activity across the surface of the brain. This enjoyed a brief period of popularity in the 1. It was never accepted by neurologists and remains primarily a research tool. Electroencephalography EEG Introduction. When the brain cells send messages to each other, they produce tiny electrical signals. Your brain cells communicate via electrical impulses and are active all the time, even when youre asleep. This activity shows up as wavy lines on an EEG recording. An EEG is one of the main diagnostic tests for epilepsy. An EEG may also play a role in diagnosing other brain disorders. In an EEG test, electrodes flat metal discs are placed onto your scalp using a sticky substance. These electrodes pick up the electrical signals from your brain and send them to an EEG machine, which will record the signals as wavy lines onto paper or on a computer. The EEG machine records your brains electrical activity as a series of traces, Each trace corresponds to a different region of the brain. An electroencephalogram EEG is a painless procedure that takes 3. What is the main diagnostic application of EEG The main diagnostic application of EEG is in the case of epilepsy, as epileptic activity can create clear abnormalities on a standard EEG study. A secondary clinical use of EEG is in the diagnosis of coma, encephalopathies, and brain death. EEGs can also help to identify causes of other problems such as sleep disorders and changes in behavior as well it can be used to evaluate brain activity after a severe head injury or before heart or liver transplantation. EEG used to be a first line method for the diagnosis of tumors, stroke and other focal brain disorders, but this use has decreased with the advent of anatomical imaging techniques such as MRI and CT. What is shown in EEG recording The EEG shows patterns of normal or abnormal brain electrical activity. Some abnormal patterns may occur with a number of different conditions, not just seizures. For example, certain types of waves may be seen after head trauma, stroke, brain tumor, or seizures. A common example of this type is called slowing, in which the rhythm of the brain waves is slower than would be expected for the patients age and level of alertness. Certain other patterns indicate a tendency toward seizures. Your doctor may refer to these waves as epileptiform abnormalities or epilepsy waves. These include spikes, sharp waves, and spike and wave discharges. Spikes and sharp waves in a specific area of the brain, such as the left temporal lobe, indicate that partial seizures might possibly come from that area. Primary generalized epilepsy, on the other hand, is suggested by spike and wave discharges that are widely spread over both hemispheres of the brain, especially if they begin in both hemispheres at the same time. Background EEG in Adults. Alpha 8 1. 3 Hz, posterior predominant, symmetric, Amp 3. V, R L by 2. 0 5. EO, drowsiness, Age 6. Hz a lt 8 in elderly suggests A. D. Slow sub harmonic, 4 5 Hz and fast alpha 1. HzTheta  Usually low amplitude at frontal central region 6 7. Hz. Rhythmic temporal theta bursts of drowsiness, Midline theta rhythm Cz maxDelta Diffuse in deep sleep, metabolic encephalopathies. Focal in structural brain lesion. Beta 1. 8 2. 5 Hz, frontal central predominant, Amp lt 2. V and lower in elderly, by benzodiazepine, light sleep and skull defect. EEG Montages. Since an EEG voltage signal represents a difference between the voltages at two electrodes, the display of the EEG for the reading EEG machine may be set up in one of several ways. The representation of the EEG channels is referred to as a montage. Bipolar montage Each channel waveform represents the difference between two adjacent electrodes. The entire montage consists of a series of these channels. For example, the channel Fp. F3 represents the difference in voltage between the Fp. F3 electrode. The next channel in the montage, F3 C3, represents the voltage difference between F3 and C3, and so on through the entire array of electrodes. Referential montage Each channel represents the difference between a certain electrode and a designated reference electrode. There is no standard position for this reference it is, however, at a different position than the recording electrodes. Midline positions are often used because they do not amplify the signal in one hemisphere vs. Another popular reference is linked ears, which is a physical or mathematical average of electrodes attached to both earlobes or mastoids. Average reference montage The outputs of all of the amplifiers are summed and averaged, and this averaged signal is used as the common reference for each channel. Laplacian montage Each channel represents the difference between an electrode and a weighted average of the surrounding electrodes. With digital EEG, all signals are typically digitized and stored in a particular usually referential montage since any montage can be constructed mathematically from any other, the EEG can be viewed by the EEG machine in any display montage that is desired. Who can read EEG The EEG is read by a neurologist, optimally one who has specific training in the interpretation of EEGs. This is done by visual inspection of the waveforms, called graphoelements. Clinical use. A routine clinical EEG recording typically lasts 2. Routine EEG is typically used in the following clinical circumstances to distinguish epileptic seizures from other types of spells, such as psychogenic non epileptic seizures, syncope fainting, sub cortical movement disorders and migraine variants. At times, a routine EEG is not sufficient, particularly when it is necessary to record a patient while heshe is having a seizure. In this case, the patient may be admitted to the hospital for days or even weeks, while EEG is constantly being recorded along with time synchronized video and audio recording. A recording of an actual seizure i.