Principles of EEG

• What does EEG stand for?

  Electroencephalogram
• What does an EEG measure?

  Electrical activity of the brain
• How does EEG differ from invasive brain imaging techniques?

  EEG is non-invasive, while others are invasive
• What type of technique is an EEG?

  Non-invasive brain imaging technique
• What frequency range do beta waves fall into?

  12-30 Hz
• What is associated with alpha waves?

  Relaxation and creativity
• What are EEG recordings used to study?

  Brain waves associated with different states
• What are key reference points for EEG electrode placement?

  Ears and forehead
• What is the process of EEG signal detection?

  • Electrodes placed on the scalp
  • Neurons fire and create electrical signals
  • Sensors detect these signals
  • Signals are amplified and recorded by a computer
• How does EEG detect brain activity?

  By placing electrodes on the scalp
• What is a key advantage of EEG?

  It is non-invasive
• What do neurons create when they fire?

  Brain waves
• Why is EEG considered cost-effective?

  It is cheaper than other neuroimaging techniques
• What is associated with gamma waves?

  Peak experiences and synchronization
• Where are electrodes placed for an EEG?

  On the scalp
• How is the 10-20 system determined for EEG electrode placement?

  Based on 10% and 20% intervals of head circumference
• What frequency range do alpha waves fall into?

  8-12 Hz
• What are the advantages and limitations of using EEG?

  Advantages:

  • Non-invasive
  • Continuous real-time monitoring
  • Cost-effective

  
  

  Limitations:

  • Low spatial resolution
  • Struggles with artifacts
  • Cannot visualize deep brain structures
• Which states can EEG help study?

  Sleep, wakefulness, and cognitive processes
• What mental state is associated with theta waves?

  Visualization and trance
• How do electrodes capture brain activity in EEG recordings?

  By measuring activity from underlying brain regions
• What regions of the brain do AF7 and TP10 correspond to?

  Frontal and temporal regions
• What frequency range do gamma waves fall into?

  30-100 Hz
• What does EEG allow for in terms of brain activity monitoring?

  Continuous monitoring in real-time
• What are brain waves measured in?

  Frequency (Hz)
• What is a limitation of EEG regarding spatial resolution?

  It has low spatial resolution
• What do sensors in EEG do with the electrical signals?

  They detect, amplify, and record them
• Which electrode sites are mentioned in the study material?

  F7, T3, and Pz
• What frequency range do delta waves fall into?

  0.5-4 Hz
• What type of brain structures can EEG not visualize?

  Deep brain structures
• What system is used for placing electrodes in EEG recordings?

  10-20 system
• What is associated with delta waves?

  Deep sleep and restoration
• What do EEG electrodes measure?

  Local electrical signals from groups of neurons
• What are key locations for electrode placement in EEG?

  AF7 and TP10
• What issue does EEG struggle with that affects its readings?

  It struggles with artifacts
• What frequency range do theta waves fall into?

  4-8 Hz
• What is a key advantage of EEG recordings?

  Provides insights without surgery or injections
• What mental state is associated with beta waves?

  Alertness and concentration
• What are the different brain wave patterns measured by EEG?

  • Gamma waves (30-100 Hz): Peak experiences, synchronization
  • Beta waves (12-30 Hz): Alertness, concentration
  • Alpha waves (8-12 Hz): Relaxation, creativity
  • Theta waves (4-8 Hz): Visualization, trance
  • Delta waves (0.5-4 Hz): Deep sleep, restoration