|
EEG Reference Value |
|
|
|
Resistance |
100-10,000 ohms
|
|
Breach rhythm |
Mu like rhythm found over skull
defects of 6-11 hz and spike like negative phases. The rhythm
recorded parasagitally is often responsive to fist clenching but
not more laterally.
|
|
Mu rhythm
(arceau,
wicket, comb rhythms) |
Arc shaped 7-11 Hz over central to
centroparietal regions. Unaffected by eye opening but blocked by
movement or thought of movement
|
|
Sharp wave |
70-200ms
|
|
Spike |
<70ms
|
|
Electrocerebral
silence |
No EEG activity over 2 microV
|
|
Sleep |
|
Stage 1 |
>50% low voltage
Mixed frequency 2-7Hz
No REM
Slow eye movements
Maybe vertex sharp
EMG normal |
|
Stage 2 |
Low voltage, mixed
frequency EEG activity
Sleep spindles
K complexes
EMG normal |
|
Stage 3 |
20-50% high amp
(>75uV) slow wave
EMG normal |
|
Stage 4 |
>50% high amp (>75uV)
slow wave
EMG normal |
|
REM |
low voltage, mixed
frequency EEG activity
REM
EMG low amplitude
|
|
|
Bancaud's
phenomenon |
Unilateral failure of alpha
blocking on eye opening; may occur with lesions of temporal or
parietal lobes.
|
|
6&14 hz Burst |
Burst of arc shaped waves over
posterior temporal regions; usually less than 75 microV
|
|
K complex |
High voltage diphasic slow wave
frequently associated with a sleep spindle.
|
|
lambda wave |
Sharp transient over occipital
region of awake subjects during visual exploration.
|
|
Photoparoxysmal
response (Photoconvulsive response) |
Bursts of slow wave and spike or
polyspike activity with discharge frequency unrelated to
flashing light and may outlast stimulus. Usually generalised,
bilaterally symmetric, bisynchronous with frontocentral
emphasis.
|
| |
|
|
|
From Michael Poon's |
