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EEG

EEG

EEG Measurement & Analysis

Electroencephalography (EEG)  is an extracellular recording (<100 Hz) of the electrical activity of the brain. EEG recordings represent the sum of a large amount of underlying neural activity, detected between electrode pairs or by single electrodes placed on the scalp.

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EEG
EEG

Signal Overview

The cerebral cortex contains numbers of neurons. Activity of these neurons is to some extent synchronized in regular firing rhythms (brain waves). Electrodes placed on the scalp can pick up variations on electrical potential that originate from this underlying cortical activity. The EEG represents the sum of a large amount of underlying neural activity. 

Single of dual channel EEG recordings may be useful for the identification of alpha activity in conscious subjects or for the recording of other specific waveforms (beta, Delta, Sigma, Theta) that are present in the EEGs of sleeping human adults. 

In some cases (such as epileptic studies), deeper brain activity cannot be recorded accurately (if at all) by scalp EEG instruments. Therefore invasive forms of EEG such as intracranial EEG (icEEG) where electrodes are placed directly inside the skull, subdural EEG (sdEEG) and electrocorticography (ECoG) where electrodes are placed directly on the exposed surface of the brain, are used to record electrical activity from the cerebral cortex. 

Signal
LabChart

Enabling Discovery

LabChart

LabChart EEG analysis software - all your EEG analysis in one place

LabChart software is designed specifically for life science data and provides up to 32 channels for data display and analysis options that are powerful and easy to use. With auto-recognition of ADI and LabChart Compatible hardware, multi-window views, one touch recording, simultaneous recording from multiple devices, specialized preconfigured settings, easy sharing options and an interface that can be customized to show only the features you want to use.

Unable to produce alpha waves?

Some completely healthy and normal subjects can show no dominant alpha activity (considered ‘relaxed’ brainwave activity,  frequency 8-12 Hz), even with their eyes shut. If this happens to you, try sourcing another volunteer. 

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Features and Add-Ons

Additional acquisition and analysis options to support your EEG analysis:

Explore EEG Data in LabChart Reader

LabChart Reader is a free application for conducting limited analyses of LabChart data. Download a trial package with example data below.

Platform Required

Thanks! Your trial package is now downloading.

Once downloaded, please unzip the folder and install the LabChart Reader application.

Open the "LabChart Data Files" folder to find data files (".adicht"). Data files can be opened in LabChart Reader by double clicking on the file name.

Request a demo

Thank you for your interest in EEG. Please complete and submit the form below and an ADInstruments representative will aim to get in touch within one working day. If you’d like to speak to someone immediately, office contact information is available from the contact page.

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Ask a question

Thank you for your interest in EEG. Please complete and submit the form below and an ADInstruments representative will aim to get in touch within one working day. If you’d like to speak to someone immediately, office contact information is available from the contact page.

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