Electroencephalography (EEG) is a reliable method of measuring electrical activity in the brain through electrodes placed on the scalp. It is a test of brain function that measures voltage differences between different parts of the brain, which can then be used clinically for gross correlation of brain activity. The EEG detects activity of large groups of neurons, which produces a greater voltage than the firing of an individual neuron. As a non-invasive method of obtaining information on brain activity related to stimuli, it is relatively easily used for experimentation with subjects. Furthermore, its capability of detecting changes in electrical activity on a millisecond-level leads to high temporal resolution. The equipment can be used to obtain Event-Related Potentials (ERP) to study structural basis, functional localization and temporal unfolding of human thought, feelings and reactions.
There are currently two EEG systems available for use in the ERP (event-related potentials) lab at Baycrest:
Each systems offers a unique opportunity to collect multi-channel recordings using a special cap that contains electrodes to record brain activity. Additionally, Baycrest also has an eye tracking system that is EEG compatible, to enable the collection of these data types simultaneously.
The EEG (and MEG) equipment was obtained through the University of Toronto Functional Imaging Research Network (FIRN) with more than $21 million of matched funding from the Canada Foundation for Innovation and the Ontario Innovations Trust. The Baycrest portion of this grant was more than $3 million.