BIOL 404-Exam 4-CNS 1
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How is and Electrocephalogram operated?
~19 electrodes attached to head with a salt paste to transmit postsynaptic electrical impulses from the surface of the brain
How are wave forms measured in an EEG?
- frequency in Hz
- Amplitude uV
The higher the frequency, the ________the Hz?
The lower the frequency, the _________the Hz
What is a typical frequency range for an EEG?
What is amplitude measured in?
What does epileptic seizure look like in an EEG?
- high uV
Why is the amplitude higher on EEG during a seizure?
More neurons firing at the same time
The amplitude can reach what level during an epileptic seizure?
When can the amplitude of an EEG reach 100mV?
Describe and Alpha rythym:
- Low Hz (4-12 or 8-14 Hz)
- Higher uV
What is the behavior during alpha rhythms?
relaxed with eyes closed
When you are relaxed with your eyes closed, what type of wave pattern do you expect on an EEG?
Describe Beta rhythms:
- High Hz (13-40Hz)
- Low uV
What is the behavior during beta rhythms?
When you are alert what EEG pattern would you expect?
Relaxed drowsiness has what type of EEG?
Both Hz and uV decline, UV can increase later
How many accidents per year due to tired drivers?
How many dollars per year due to workplace sleepiness?
How many Americans are sleep deprived?
What is the purpose of sleep?
- Conserve energy
- repair and growth
- learning and memory consolidation
What can occur with sleep deprivation?
- Less: hallucinogenic phenomena
- More: Coma and death
What happens to the body temperature when you sleep?
What happens to GH levels during sleep?
Why do growth hormone levels increase during sleep?
Growth occurs at night when metabolism for activity is low
What system regulates sleep and wakefulness?
Endogenous circadian rhythms
How much sleep do most adults need?
What would you like to do?
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