The document discusses the function and history of EEG and describes different brain wave patterns. It summarizes: 1) EEG measures brain waves through electrodes placed on the scalp, detecting voltage fluctuations from neuron action potentials. It uses silver electrodes to obtain accurate readings through the skull and other tissues. 2) There are different brain wave patterns associated with different brain states and sleep stages, including alpha waves during relaxation, beta waves during activity, theta waves during drowsiness, and delta waves during deep sleep. 3) The history of EEG began in 1875 with experiments localizing brain functions, and the first human EEG was recorded in 1924, leading to discoveries of additional wave types and correlations with brain states.

1. Dr.M.Arivumani

2. EEG 1

3. EEG2

4. EEG 3

5. EEG 4

6. EEG 5

11. Alpha

13. Beta

20. EEG brain waves in the Sleep Cycle:

21. Position of electrodes

22. A1-lefrt ear A2-right ear Fp-frontal pole leads F-frontal leads P-parietal leads C-central leads T-temporal leads O-occipital leads

23. Spikes and slow wave copmlexes- typical- 3/sec-absence seizures fast - 4-6/sec-myoclonic jerks slow -1-2.5/sec-intractable epilepsy with MR

24. Polyspikes –these rapid Polyspikes are found in GTCS Post traumatic epilepsy Lennox gastaut syndrome

26. EEG 1

27. Fast Spike and wave complexes GTCS

28. EEG 2

29. Repitive Spike on left side-right sided partial seizure

30. EEG 3

31. Spike and slow wave complex 3/sec absence seizure

33. EEG 4

34. High voltage delta activity-deeply comatose patient

35. EEG 6

36. SSPE- Periodic discharges at 4 sec interval. Maximum at fronto central areas Giant slow waves mixed with several sharp waves