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Questions and Answers
Which brain wave pattern is associated with deep sleep?
Which brain wave pattern is associated with deep sleep?
What condition might cause a change in EEG activity due to alterations in body chemistry?
What condition might cause a change in EEG activity due to alterations in body chemistry?
At what frequency range do alpha waves occur?
At what frequency range do alpha waves occur?
What does an 'alpha block' represent in EEG readings?
What does an 'alpha block' represent in EEG readings?
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Which of the following is NOT a common factor affecting EEG readings?
Which of the following is NOT a common factor affecting EEG readings?
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Study Notes
EEG (Electroencephalography)
- Records electrical activity from the brain
- Used to diagnose epilepsy and other brain disorders
EEG Recording
- Electrodes are placed on the head
- Records brain activity in different conditions
- Recording can be difficult due to interference from hair, scalp, and skull
- Proper connections and equipment are required
EEG Measurements
- Measures frequency (Hz: cycles per second) and amplitude (uV: microvolts)
Brain Wave Patterns
- Alpha Waves: 8-13 Hz, relaxed state with eyes closed
- Beta Waves: 13-30 Hz, alert state with eyes open
- Theta Waves: 4-8 Hz, young children and some sleep patterns
- Delta Waves: 1-4 Hz, deep sleep
Factors Affecting Brain Wave Activity
- Sensory stimuli
- Brain pathology: tumors, epilepsy, infections, stroke, dementia, head injury
- Changes in body chemistry: blood glucose, oxygen deprivation, drugs, blood pH
- Absence of any brain activity indicates death
Alpha Waves
- Measure the degree of cortical activity
- Alpha Block: interruption of alpha waves with stimuli (mental activity, vision, sound)
- More activity leads to less alpha wave activity
Long-Term (LT) EEG Recordings
- Focus on alpha pattern
- Electrodes placed on frontal and occipital areas
- Observe effects of muscle movement, mental concentration, sound, and vision on alpha waves
- Normal EEG amplitudes never exceed + or - 50 microV
EEG Frequency vs Amplitude
- Observe the relationship between frequency and amplitude
Lab Assignment
- Electroencephalography (EEG)
- Save report as a PDF and post in the MyCourses assignment box
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Description
Explore the basics of Electroencephalography (EEG) in this quiz. Learn how EEG records brain activity, the different brain wave patterns, and factors that affect brain activity. This quiz is essential for understanding the application of EEG in diagnosing brain disorders.
