EEG + ERP

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  • Created by: 0045253
  • Created on: 31-05-22 16:05
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  • Electroencephalogram (EEGs) + Event-related potentials (ERPs) 
    • EEG
      • A method of recording changes in the electrical activity of the brain using electrodes attached to the scalp
      • Electrical signals from different electrodes are graphed over a period of time 
        • The recording represents the brainwave patterns that are generated from the action of millions of neurons
    • ERP
      • Electrodes are put on the scalp and detect neuronal activity  in response to a stimulus introduced by the researcher
    • Differences
      • EEG is a recording of general brain activity usually linked to states such as sleep and arousal, whilst ERPs are elicited by specific stimuli presented to the participant.
    • STRENGTH
      • P -  A strength of EEG AND ERP is they are not an invasive technique.
        • E - EEG/ERP does not rely on the use of radiation or cause any damage to individuals
          • E - They are also more practical than fMRI because they do not require the individual to stay still for long periods of time and can be more comfortable which makes them useful for children. They are also cheaper than fMRI scans.
            • L - This means that people are more likely to use EEG/ERP over some other ways of studying the brain 
    • WEAKNESS
      • P -  A weakness of EEG and ERP is that they have poor spatial resolution.
        • E - Information is received from many thousands of neurons on the surface of the brain. 
          • L - This means that both methods are not useful in pinpointing the exact source of neural activity (e.g. localisation).
    • non-invasive
    • Cheap
    • Spatial resolution: Poor
    • Temporal resolution: Good

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