Mapping and resolution of normal EEG

EEG is a figure obtained by magnifying the spontaneous biological potential of the brain from the scalp by a sophisticated electronic instrument, and the spontaneous, rhythmic electrical activity

With the rapid development of EEG analysis technology and the continuous deepening of EEG research and understanding, beginners are required to accurately grasp the basic knowledge of EEG, and then make judgments

1.

Unlabeled EEG (bipolar lead-double banana)

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Normal awake EEG during normal wakefulness, head dominant rhythm after posterior dominant rhythm, saccade to left/right eye saccade, rectus muscle artifact extraocular muscle activity pseudo-poor, eye blink (upward saccade) blink/transient (up), transient can record 100-300uv at the frontal pole, The time limit is about 300ms positive phase wave, followed by a lower to negative phase wave, which is an eye-opening reaction; left/right cheek leads left and right cheek leads, left/right temporal leads left and right temporal region leads, left/right parasaggital leads left and right side side midline leads, central leads centerline leads

Unlabeled EEG (bipolar lead-double banana)

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The appearance of the head dominant rhythm after PDR appears (after closing the eyes), and the disppears of the head dominant rhythm after PDR disppears (after opening the eyes); As shown in the figure, the normal reaction of closing the eyes: the head rhythm is suppressed after opening the eyes, and the incubation period is < 1s, called α block; Head rhythm recovery

Unlabeled EEG (bipolar lead-double banana)

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Normal awake EEG during normal wakefulness, eye blinks have ceased but PDR remains blinking stops, after head dominance rhythm is maintained

Unlabeled EEG (bipolar lead-double banana)

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PDR (posterior dominant rhythm ) appears/disappears after head dominance rhythm appears/disappears, eye closure/opening/eye opening

Unlabeled EEG (mean reference lead)

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diffuse beta activity diffuse β activity, mostly low amplitude, frontal zone 20-30Hz; The occipital region is 14-20Hz, that is, the fast alpha fast α wave in the figure, which is the variation of the α wave.

Unlabeled EEG (bipolar lead-double banana)

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hyperventilation hyperventilation, the purple logo in the lower left corner indicates the beginning of hyperventilation; Normal awake background normal awake background activity, normal posterior dominant rhythm normal after head dominant rhythm

Unlabeled EEG (bipolar lead-double banana)

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90 seconds post hyperventilation 90 seconds after hyperventilation, normal awake background normal awake background activity, normal posterior dominant rhythm normal head dominant rhythm, eye blink blink

Unlabeled EEG

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hyperventilation hyperventilation, This burst of generalized theta and delta slowing occurred 1min 50 sec into HV and is probably normal 1 minute 50 seconds after the appearance of θ and δ slow wave widespread release is likely to be normal, movement artifact in EKG caused by Breathing is disturbed

Unlabeled EEG (bipolar lead-double banana)

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hyperventilation-2minutes hyperventilation for 2 minutes, diffuse delta and theta slow activity superimposed on a normal awake background with diffuse δ and θ slow wave activity on normal posterior dominant rhythm after normal posterior dominant rhythm

Unlabeled EEG (bipolar lead-double banana)

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hyperventilation-3minutes hyperventilation for 3 minutes, diffuse delta and theta slow activity superimposed on a normal awake background with diffuse δ and θ slow wave activity on normal awake background activity; End HV in the lower right corner: Hyperventilation stops, normal posterior dominant rhythm is restored after normal head rhythm; Hyperventilation-induced slow-wave reactions such as early appearance (occurring within 30s of starting) or delayed disappearance (slow wave does not disappear after 30 s after ventilation stop) are abnormal

Unlabeled EEG (bipolar lead-double banana)

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3Hz Photic Stim 3Hz flash stimulation, msec delay millisecond delay (delay in light drive response and flash stimulation time), mild asymmetry mild asymmetry, with normal driving response causing normal light drive response

Unlabeled EEG (bipolar lead-double banana)

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5Hz Photic Stim 5Hz flash stimulation, msec delay millisecond delay (delay in light drive response and flash stimulation time), mild asymmetry mild asymmetry, with normal driving response causes normal light drive response

Unlabeled EEG (bipolar lead-double banana)

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7Hz Photic Stim 7Hz flash stimulation, msec delay millisecond delay (delay in light drive response and flash stimulation time), mild asymmetry mild asymmetry, with normal driving response causes normal light drive response

Unlabeled EEG (bipolar lead-double banana)

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10Hz Photic Stim 10Hz flash stimulation, msec delay millisecond delay (delay in light drive response and flash stimulation time), mild asymmetry mild asymmetry, with normal driving response causing normal light drive response
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Unlabeled EEG (bipolar lead-double banana)

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15Hz Photic Stim 15Hz flash stimulation, msec delay haosecond delay, driving-mild asymmetry mild asymmetry, with normal driving response causing normal light-driven response
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Unlabeled EEG (bipolar lead-double banana)

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25Hz Photic Stim 25Hz flash stimulation, msec delay haosecond delay, driving-mild asymmetry mild asymmetry, with normal driving response causing normal light-driven response
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Unlabeled EEG (bipolar lead-double banana)

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30Hz Photic Stim 30Hz flash stimulation, minimal driving slight drive response, with normal driving response causing normal light drive response, PDR posterior head dominant rhythm
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Unlabeled EEG (bipolar lead-double banana)

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NORMAL DROWSY, PDR (posterior dominant rhythm) mostly attenuated after most disintegration of the dominant rhythm of the head, minimal muscle artifact with mild EMG pseudo-poor, eyeblinks are absent without blinking or transient
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Unlabeled EEG (bipolar lead-double banana)

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stage 1 sleep sleep phase 1 EEG, attenuated PDR after disintegration of the dominant rhythm of the head, eyes rove to the left/right eye turn left or right, roving eye movements eye rotation activity
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Unlabeled EEG (bipolar lead-double banana)

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Unlabeled EEG

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NORMAL STAGE 2 SLEEP Normal Sleep Phase 2 (here NREM I and II.
) EEG, K complex(wide vertex + spindle)K-synthesis wave consists of two parts, the first is a high-amplitude composite biphasic or multiphase slow wave, similar to the top wave, but often wider than the top wave, the slow wave is followed by a deeper positive phase deflection, followed by a string of 12-14Hz spindle waves, vertex wave top wave, Sleep spindle sleep spindle
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Unlabeled EEG (bipolar lead-transverse)

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STAGE 2 SLEEP EEG 2, spindle spindle, vertex wave apex wave, POSTS (positive occipital sharp transients of sleep) sleep occipital area transient positive phase sharp wave
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Unlabeled EEG (bipolar lead-transverse)

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Kcomplex(wide vertex + spindle) K-synthesis wave consists of two parts, the first is a high-amplitude composite biphasic or multiphase slow wave, similar to the top wave, but often wider than the top wave, the slow wave is followed by a deeper positive phase deflection, followed by a string of 12-14Hz spindle waves, POSTS (positive occipital sharp transients of sleep) sleep period occipital area transient positive phase sharp wave, vertex wave top wave, sleep spindle sleep spindle
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Unlabeled EEG (bipolar lead-transverse)

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STAGE 2 SHLEE Sleep Phase 2 EEG, vertex wave top wave, sleep spindle sleep spindle, K complex (wide vertex + spindle) K-synthesis wave consists of two parts, the first is a high amplitude composite biphasic or multiphase slow wave, similar to the top wave, but often wider than the top wave, the slow wave is followed by a deeper positive phase deflection, followed by a string of 12-14Hz spindle
。

Unlabeled EEG (bipolar lead-transverse)

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REM SLEEP REM SLEEP REM, eye movements to the left/right Eye Movement Left or Right, sawtooth waves (2-6Hz, REM characteristic waves), overall absence of muscle artifact overall no EMG deficiency
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Unlabeled EEG (mean reference lead)

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REM SLEEP REM EYE Sleep, Alpha Intrusion occasionally seen in REM α waves occasionally appear during REM sleep, saccade to left/right eye glance left or right, overall absence of muscle artifact Overall no EMG pseudo poor, EKG artifact ECG pseudo poor, EMG from rectus Muscle is typically sharper than signal The EMG signal produced by the eye muscles from cortexya is sharper
than cortical epilepsy waves (sharp or spikes).

Other normal REM

References:

1.
Strayhorn D.
The Atlas of Adult Electroencephalography.
http://eegatlas-online.
com/index.
php/en/