Understanding Electroencephalography - University of Arkansas for ...

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Factors that Attenuate Voltage Primarily overlying spinal fluid and dura Scalp to a lesser extent Scalp recorded activity represents “spatial averaging” of electrical activity from a limited area of cortex 20-70% of epileptiform activity may not be seen on scalp EEG Involvement of small areas of tissue is associated with much greater attenuation of activity Activity arising from cortex within the walls or depths of sulci may not be recorded
Origin of EEG Rhythmicity Rhythmical activity – sequences of regularly recurring waveforms of similar shape and duration Rhythmical activity may be locally generated or occur via projected synaptic inputs from deeper structures The thalamus, via an anatomic cellular organization, thalamocortical projections and mechansims that are not fully understood, governs different types of rhythmical activity Sleep spindles Alpha rhythm in the occipital cortex 3 per second spike and wave associated with absence seizures
Page 1 and 2: B. Sharp, M.D. Gregory of Pediatric
Page 3 and 4: Synaptic Potentials: The Basis of E
Page 5 and 6: EEG: A Reflection of Current Sponta
Page 7 and 8: Rhythmical vs. Arrhythmical EEG Act
Page 9: Factors Affecting EEG Waveforms Vol
Page 13 and 14: Posterior Alpha Rhythm Fp1-F3 F3-C3
Page 15 and 16: The Spike and Wave Complex The cell
Page 17 and 18: Neuronal Synchronization The interi
Page 19 and 20: EEG Frequencies Delta Theta Alpha 8
Page 21 and 22: Trace Discontinue in 27 week EGA Ne
Page 23 and 24: 2 month old with Enterococcal menin
Page 25 and 26: 2 month old with Enterococcal menin
Page 27 and 28: EEG During Sleep Stage I sleep Drop
Page 29 and 30: Stage 3-43 4 Sleep Fp1-F3 F3-C3 C3-
Page 31 and 32: Focal Epileptiform Discharges and A
Page 33 and 34: Generalized EEG Abnormalities Gener
Page 35 and 36: Generalized Polyspike Wave Fp1-F3 F
Page 37 and 38: Generalized Delta Slowing Fp1-F3 F3
Page 39 and 40: EEG Monitoring in Critical Care Man
Page 41 and 42: 11 y/o boy with severe cardiomyopat
Page 43 and 44: 11 y/o boy with severe cardiomyopat
Page 45 and 46: Clinical Case 8.5 year old boy with
Page 47 and 48: EEG: Recorded Seizure *Fp1-F3 *F3-C
Page 49 and 50: *Fp1-F3 *F3-C3 *C3-P3 *P3-O1 Fp2-F4
Page 51 and 52: 3D-MRI Image
Page 53 and 54: Craniotomy with Lesion Localization
Page 55 and 56: Cortical Grid Map
Page 57 and 58: Electrocortical Seizure Recording 4
Page 59 and 60: 41-42 42-43 43-44 44-45 45-46 49-50
Page 61 and 62:
Cortical Stimulation: Arm
Page 63 and 64:
Cortical Resection
Page 65:
Depth EEG Recording 33-34 34-35 35-
Page 68:
2 month old with Enterococcal menin
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