Spastic-Seizure-I.mp3
Spastic-Seizure-I.mp4
Spastic-Seizure-Unplugged-Underground-XVIII.mp3
Spastic-Seizure-Unplugged-Underground-XVIII.mp4
Spastic-Seizure-intro.mp3
[Intro]
Abnormal electrical activity
(In the brain)
Feel the weight, the gravity
(Of the strain)
[Verse 1]
Are your ions (on)
Does the flow know where to go
Action potential
Ions are on (on and on)
[Bridge]
(Zap!)
Under attack
(A grand mal sprawl)
[Chorus]
Abnormal electrical activity
(In the brain)
Feel the weight, the gravity
(Of the strain)
[Verse 2]
Capacitance
(And resistance)
The law of Ohm
(Om Ohm, Om Ohm)
[Bridge]
(Zap!)
Under attack
(A grand mal brawl)
[Chorus]
Abnormal electrical activity
(In the brain)
Feel the weight, the gravity
(Of the strain)
[Outro]
(Zap!)
Stand back (back, back, back)
——————————
[Verse 3]
The law of Ohm
(Om Ohm, Om Ohm)
Ions on
(And on and on)
[Bridge]
(Zap!)
Under attack
[Instrumental, Guitar Solo]
(A grand mal thrawl)
[Chorus]
Abnormal electrical activity
(In the brain)
Feel the weight, the gravity
(Of the strain)
[Outro]
(Zap!)
Stand back (back, back, back)
A SCIENCE NOTE
A spastic seizure (or tonic-clonic seizure, previously called a grand mal) involves abnormal electrical activity in the brain, which triggers involuntary muscle contractions. The physics and biology overlap here in some fascinating ways. Let’s break it down:
1. Electricity and the Brain: Basic Neurophysics
Your brain and nervous system are essentially electrochemical circuits.
How neurons communicate:
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Neurons use electrical signals (called action potentials) to transmit messages.
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These signals are caused by ions (charged particles) like Na⁺ and K⁺ moving across the cell membrane.
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When the charge difference (voltage) across the membrane reaches a threshold, the neuron “fires.”
Key Physics:
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Voltage: Difference in electric potential across the membrane.
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Current: Flow of ions down the neuron’s axon.
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Capacitance and resistance: Membranes act like tiny capacitors (charge storage) with built-in resistance.
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Ohm’s Law applies: V = IR, where current (I) is driven by voltage (V) across resistance (R).
2. What Happens During a Spastic Seizure
A seizure occurs when:
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Large groups of neurons fire uncontrollably and simultaneously.
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The normal balance between excitatory (go!) and inhibitory (slow down!) signals is disrupted.
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This causes a “storm” of electrical activity in the brain.
During a spastic or tonic-clonic seizure:
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Tonic phase: Muscles suddenly stiffen (tonic contraction) due to sustained neural firing.
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Clonic phase: Muscles rapidly contract and relax (jerking), driven by rhythmic bursts of electrical activity.
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The motor cortex (controls movement) is often the source or relay point.
3. Physics of the Spasms: Electromuscular Coupling
Muscle contractions are triggered by:
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Nerve impulses reaching muscle fibers.
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Release of calcium ions (Ca²⁺) inside the muscle cells.
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Calcium allows actin and myosin (muscle proteins) to slide past each other, contracting the muscle.
In a seizure:
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The brain sends excessive, repeated electrical signals to muscles.
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Muscles respond with violent, involuntary contractions.
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The rhythm of firing during the clonic phase often appears chaotic but is sometimes semi-synchronized.
4. Recovery and Aftermath: The Refractory Period
After the seizure:
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Neurons enter a refractory state — they can’t fire again until ionic balance is restored.
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This involves pumps (like the sodium-potassium pump) actively restoring charge differences.
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That’s why a person often appears confused, exhausted, or unconscious post-seizure — the brain is “rebooting.”
Bonus: What Triggers the Breakdown?
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Genetics (e.g. epilepsy)
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Brain trauma
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High fever (in children)
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Low blood sugar
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Drugs or withdrawal
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Strobe lights (photosensitive epilepsy)
These can all disrupt ion channels, neurotransmitter balance, or network regulation, leading to runaway electrical activity.