|
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.
|
|
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