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The contingent negative variation (CNV) is a negative slow surface potential, as measured by electroencephalography (EEG), that occurs during the period between a warning stimulus or signal and an imperative ("go") stimulus. [1] The CNV was one of the first event-related potential (ERP) components to be described.
The sinusoidal flicker elicits an oscillatory brain electrical response known as the Steady State Visually Evoked Potential . [2] [3] Task related changes in brain activity in the vicinity of the recording site are then determined from SSVEP measurements at that site. One of the most important features of the SST methodology is the ability to ...
EEG measures the brain's electrical activity directly, while other methods record changes in blood flow (e.g., SPECT, fMRI, fUS) or metabolic activity (e.g., PET, NIRS), which are indirect markers of brain electrical activity. EEG can be used simultaneously with fMRI or fUS so that high-temporal-resolution data can be recorded at the same time ...
LGS is a combination of atonic absences, tonic seizures, cognitive deterioration, and slow spike-wave activity in the EEG. This syndrome usually results from focal, multifocal, or diffuse brain damage and can be divided into symptomatic and cryptogenic types.
They are generated in widespread cortical locations [1] though they tend to predominate over the frontal parts of the brain. [5] Both K-complex and delta wave activity in stage 2 sleep create slow-wave (0.8 Hz) and delta (1.6–4.0 Hz) oscillations. However, their topographical distribution is different, and the delta power of K-complexes is ...
Abnormally excessive or synchronous neuronal activity in the brain can cause seizures. These symptoms are characteristic of the neurological disorder known as epilepsy. Epilepsy is typically diagnosed with an EEG test. [6] However, the effectiveness of MEG in the diagnosis of neocortical epilepsy has also been established. [7]
The sensorimotor rhythm (SMR) is a brain wave. It is an oscillatory idle rhythm of synchronized electric brain activity. It appears in spindles in recordings of EEG, MEG, and ECoG over the sensorimotor cortex. For most individuals, the frequency of the SMR is in the range of 7 to 11 Hz. [1]
The EEG proved to be a useful source in recording brain activity over the ensuing decades. However, it tended to be very difficult to assess the highly specific neural process that are the focus of cognitive neuroscience because using pure EEG data made it difficult to isolate individual neurocognitive processes. Event-related potentials (ERPs ...