EEG Presentation Kassing/Konold


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A short description of the brain scanning method: electroencephalogram. In addition o the basic method, the slideshow also briefly describes the techniques strengths and weaknesses compared to other brain scanning techniques.

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EEG Presentation Kassing/Konold

  1. 1. The EEG (Electroencephalogram) { Jason Konold and Gero Kassing
  2. 2.  One of the older methods of brain scanning  1875, Richard Caton presented findings of electrical phenomena in the brains of rabbits and monkeys 1912, Vladimir Vladimirovich PravdichNeminsky created the first animal electroencephalogram 1924 First human electroencephalogram recorded by Hans Berger (he also named it)   A Short History
  3. 3. Hans Berger
  4. 4. { How It Works
  5. 5. Large-Scale Neuron Action    Neurons (brain cells) become charged when active The electrodes are sensors that detect changes in electrical charge A single neuron becoming charged cannot be detected by an EEG, so the EEG measures large groups of neurons acting simultaneously
  6. 6. Neurons
  7. 7.    Usually last 20-30 minutes Electrodes placed on the scalp  The standard placement is in the “10-20 System” or “International 10-20 System” Patient conducts activities to generate responses  Hyperventilating  Photic stimulation (a fancy way of saying “shine a light in their face”)  Sleep (or sleep deprivation)  Mental exercises A Typical Clinical Session
  8. 8. 10-20 System (of electrode placement)
  9. 9.    In the 10-20 System, electrodes are given a letter corresponding to which lobe they are placed on…  P- Parietal  T- Temporal  O- Occipital  F- Frontal …or a letter based on general positioning  Fp- Frontopolar  C- Central  A- Auricular (over the ear) Then they receive a number based on lateral position: an odd number if on the left hemisphere and an even number if on the right Naming the Electrodes
  10. 10. For Example Right hemisphere, first electrode in auricular area, therefore it receives the name A2
  11. 11. Electrocorticography (ECoG)    Electrodes may be inserted into the skull Also known as subdural or intracranial EEG (SD-EEG or I-EEG) Sometimes used in the case of patients with epilepsy
  12. 12. Advantages & Disadvantages {
  13. 13. Advantages  EEG costs significantly less  Is much more portable  no exposure to magnetic fields or x-rays  Is silent – this is important when studying reactions to audio  No claustrophobia  No needles
  14. 14. Disadvantages  Sticky electrodes  Poor resolution  Most sensitive to post- synaptic potentials – cortex Large areas of the cortex have to be activated for the electrodes to register anything on the skull  Uncountable number of activity of neurons tells us  what parts of the brain are active, but not enough to make an exact conclusion to the localization
  15. 15. References Alivanit. (1998, November 27). Advantages of EEG in Comparison to High Technology Brain Imaging Methods. EEG Manual. Retrieved October 31, 2013, from Brain neuron forest. (n.d.). Alzheimer's association. Retrieved October 30, 2013, from Electroencephalography. (2013, October 29). Wikipedia. Retrieved October 31, 2013, from Law, A., & Halkiopoulos, C. (2010). The biological level of analysis. Psychology: developed specifically for the IB diploma (pp. 40 - 41). Oxford, U.K.: Pearson Education. Lemke, S. (1999, November 1). History. Department of psychiatry and psychotherapy. Retrieved October 30, 2013, from Geschichte.html Mathias, R. (1996, December 1). The basics of brain imaging. NIDA notes. Retrieved October 30, 2013, from NNVol11N5/Basics.html Schachter, S. (2006, December 15). How to read an EEG. Epilepsy. Retrieved October 31, 2013, from Smith, S. (n.d.). EEG in the diagnosis, classification, and management of patients with epilepsy. -- Smith 76 (suppl 2): ii2. Retrieved October 31, 2013, from What is Electroencephalography (EEG). (2013, February 1). Mega Electronics Ltd RSS. Retrieved October 31, 2013, from electroencephalography-eeg/