EEG Rhythm in Normal Awake Adult
The Electroencephalogram (EEG) measures the electrical activity of the brain. Specific patterns, called rhythms, correlate with different mental states. The question asks for the typical EEG rhythm in a normal, awake adult who is resting quietly with their eyes closed.
Analyzing Brain Rhythms
Different EEG rhythms are defined by their frequency ranges (measured in Hertz, Hz):
- Delta Rhythm: Less than $4$ Hz. Predominant during deep sleep.
- Theta Rhythm: $4$ Hz to $7$ Hz. Associated with drowsiness, light sleep, and some cognitive tasks.
- Alpha Rhythm: $8$ Hz to $13$ Hz. Characteristic of a relaxed, awake state, particularly prominent with eyes closed.
- Beta Rhythm: More than $14$ Hz. Typically observed during active thinking, alertness, and concentration.
Identifying the Correct Rhythm
The state described – a normal, awake adult resting quietly with eyes closed – is known to produce a characteristic pattern called the Alpha rhythm.
This rhythm falls within the frequency range of $8$ to $13$ Hz.
Therefore, the correct EEG activity recorded in this state is the Alpha rhythm.
Important Questions from Epilepsy
Consider the following with regard to trigger factors for seizures :
1. Flickering lights
2. Recreational drug misuse
3. Non-compliance to treatment with antiepileptic drugs
4. Sleep deprivation
Which of the factors given above are correct?
Focal seizures may be associated with which of the following?
1. Jacksonian march
2. Todd's paralysis
3. Epilepsia partialis continua
Select the correct answer using the code given below.
- Typical absence seizures are characterized by
- In a young epileptic woman wishing to use oral contraceptive agents, which of the following drugs is not an ideal agent?
- Which of the following is not useful in the management of status epilepticus?
