EEG Lab Report PDF

EEG lab  EEG (Electroencephalography) Recording of the electrical activity from the brain -used to diagnose epilepsy and other brain disorders - Electrodes placed on areas of head - records brain activity under different conditions EEG recording can be technically difficult because...

EEG lab  EEG (Electroencephalography) Recording of the electrical activity from the brain -used to diagnose epilepsy and other brain disorders - Electrodes placed on areas of head - records brain activity under different conditions EEG recording can be technically difficult because - Interference from hair, scalp, skull So proper connections and equipment are necessary EEG measures frequency ( units - Hz cycles per second) and amplitude (units – uV) Brain Wave Patterns: 1. Alpha – relaxed, eyes closed; 8-13 Hz. 2. Beta – alert, eyes open; 13- 30 Hz. 3. Theta – young children, some sleep patterns 4-8 Hz. 4. Delta – deep sleep; 1-4 Hz. Brain wave activity affected by….. Sensory stimuli Brain pathology: tumors, epilepsy, infections, stroke, dementia, head injury Change in body chemistry: - blood glucose, oxygen deprivation, drugs, blood pH Absence of any brain activity is “death” Alpha waves measure the degree of cortical activity Alpha Block: interruption of alpha waves with addition of stimuli - mental activity, sensory input from vision or sound More activity = less alpha  LT recordings Focus is on Alpha pattern Placement of electrodes on Frontal & Occipital areas of head Observe effects of muscle movement, mental concentration, sound and vision on alpha brain wave. Normal EEG amplitudes never exceed + or – 50 microV EEG Frequency vs Amplitude Observe relationship between frequency and amplitude  Lab Assignment LT lesson – Electroencephalography (EEG) When complete, save report as pdf and post in assignment box in myCourses.