JHA410H1 Lecture Notes - Lecture 7: Traumatic Brain Injury, Reference Electrode, Neural Oscillation
Document Summary
Eeg records electrical activity (action potentials) of the brain; it is typically non-invasive, with electrodes placed along the scalp. Invasive electrodes are used in electrocorticography (ecog) - this is only during surgery when electrodes are placed exactly on brain to determine origin of seizure activity. The diagnostic potential of eeg is used for: seizures, evoked-related potentials (erp): visual, auditory, and somatosensory. In health person there is well defined erp wave-forms usually defined in terms to positive (p), negative (n), and timestamps (100ms, 200ms, etc. : spectral content: gives you information about frequency which is useful in examining sleep disorders. In addition to diagnostic potential eeg is also used in sleep disorders, anaesthesia, coma, and brain death: can also inform characterization in many cognitive disorders, traumatic brain injury (tbi), dementia, asd, and depression. Research use: eeg and erp are used in neuroscience, cognitive science, neurolinguistics, psychology, auditory processing disorders, etc.
