Brain injuries from loud bass?

Jun 29, 2019
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Repeated low-intensity impacts, like pulled sparring punches, can cause brain injury, but that's because of the brain hitting against the skull.

Explosions can also cause brain injury:

(Effects of Low-Level Blast Exposure on the Nervous System: Is There Really a Controversy?)
"...Questions have also emerged as to whether pathophysiologically blast-related TBI is different from the type of non-blast TBI (nbTBI) typical of civilian trauma where injury is caused by inertial and rotational forces along with the effects of blunt impact (37, 38). The most direct physical effects of these forces are bleeding, direct tissue damage, and mechanical shear stress along white matter tracts, which in turn leads to activation of a variety of pathophysiological cascades that are associated with further tissue damage (37, 39). Blast injuries by contrast result from a pressure wave generated at a distance and transmitted though air, which may induce stresses in the brain without significant global motions being imparted. Damage to the nervous system is thought to occur through biophysical mechanisms related to the traveling shock wave’s interaction with the brain (4042), although it has also been suggested that a blast wave striking the body can induce oscillating pressure waves, which can be transmitted through the systemic circulation to the brain (12, 43)..."

Loud bass frequencies can vibrate things visibly. If I'm listening to music in the car with loud bass, the rearview mirrors vibrate enough to be blurry, without a subwoofer, just on little factory economy car speakers. It's small impacts compared to boxing or explosives, but what about the cumulative effect with enough time? And with a louder bass amp?

Is it not commonly known that bassists are getting brain injuries just because of how weird the bassists already were? Is the SVT making me r-worded or is it not the SVT's fault?
 
Attenuation of Sound Waves

"...Absorption is the conversion of the sound energy to other forms of energy. The combined effect of scattering and absorption is called attenuation... The amplitude change of a decaying plane wave can be expressed as:

A = Ao*(e^-az)

In this expression Ao is the unattenuated amplitude of the propagating wave at some location. The amplitude A is the reduced amplitude after the wave has traveled a distance z from that initial location. The quantity is the attenuation coefficient of the wave traveling in the z-direction. The dimensions of are nepers/length, where a neper is a dimensionless quantity. The term e is the exponential (or Napier's constant) which is equal to approximately 2.71828.

The units of the attenuation value in Nepers per meter (Np/m) can be converted to decibels/length by dividing by 0.1151. Decibels is a more common unit when relating the amplitudes of two signals."

___

Attenuation Constant » IT'IS Foundation

I entered "Frequency: 100 Hz"

Attenuation constant of
Skull cortical: 0.00545529
Cerebrospinal fluid: 0.00000999
Brain: 0.000042925

Divide those by 0.1151 to use db...
Skull cortical: 0.047396
CSF: 0.00008679
Brain: 0.00037293

___

Back to the equation

A = Ao*(e^-αz)

through 1/4" of skull
A = 120db * (2.71828 ^ -(0.047396 * .25 inches))
A = 118.586 db

then through ~5 mm of CSF
A = 118.5 db * (2.71828 ^ -(0.00008679 x .2"))
A = 118.497 db

then through 3" of brain
A = 118.4 db * (2.71828 ^ -(0.00037293 x 3"))
A = 118.268 db


At 130 db

through 1/4" of skull
A = 130db * (2.71828 ^ -(0.047396 * .25 inches))
A = 128.469 db

then through ~5 mm of CSF
A = 128.5 db * (2.71828 ^ -(0.00008679 x .2"))
A = 128.498 db

then through 3" of brain
A = 128.4 db * (2.71828 ^ -(0.00037293 x 3"))
A = 128.25 db

___


My calculations confirm, as I suspected, that when a bass amp vibrates the walls throughout a house, it does the same to my brains. Our hypothesis that this is making me r-worded will require further research.
 
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Instead of 100 Hz, doing 200 Hz

(Attenuation constant for 200 Hz, converted for db, of
Skull: 0.0947922
CSF: 0.00017376
Brain: 0.00091828)

at 130 db

through 1/4" of skull
A = 130db * (2.71828 ^ -(0.0947922 * .25 inches))
A = 126.9 db

then through ~5 mm of CSF
A = 126.9 db * (2.71828 ^ -(0.00017376 x .2"))
A = 126.89 db

then through 3" of brain
A = 126.89 db * (2.71828 ^ -(0.00091828 x 3"))
A = 126.5 db

___

500 Hz

(Attenuation constant for 500 Hz, converted for db, of
Skull: 0.23698
CSF: 0.000434404
Brain: 0.00302203)

at 130 db

through 1/4" of skull
A = 130db * (2.71828 ^ -(0.23698 * .25 inches))
A = 122.5 db

then through ~5 mm of CSF
A = 122.5 db * (2.71828 ^ -(0.000434404 x .2"))
A = 122.4 db

then through 3" of brain
A = 122.4 db * (2.71828 ^ -(0.00302203 x 3"))
A = 121.3 db

___

1000 Hz

(Attenuation constant for 100 Hz, converted for db, of
Skull: 0.4739617
CSF: 0.000868809
Brain: 0.0074411)

at 130 db

through 1/4" of skull
A = 130db * (2.71828 ^ -(0.4739617 * .25 inches))
A = 115.4 db

then through ~5 mm of CSF
A = 115.4 db * (2.71828 ^ -(0.000868809 x .2"))
A = 115.3 db

then through 3" of brain
A = 122.4 db * (2.71828 ^ -(0.0074411 x 3"))
A = 112.7 db
 
Saw Weedeater a couple of years ago, front and center of two Sunn’s and two 2x15’s. My WordBlitz scores have tanked ever since :D I visited the IHOP nearby after the show and could barely hear my waitress over the ringing. I can believe something like that over time could scramble someone’s eggs. No more for this skinny old coot.

BCAEF1A3-4763-44A9-8795-425691CC2FC2.jpeg
 
Saw Weedeater a couple of years ago, front and center of two Sunn’s and two 2x15’s. My WordBlitz scores have tanked ever since :D I visited the IHOP nearby after the show and could barely hear my waitress over the ringing. I can believe something like that over time could scramble someone’s eggs. No more for this skinny old coot.

View attachment 4065024

I'm having a hard time believing anybody could go out to eat after seeing the always amazing Weedeater because of Dixie Daves on-stage "performance art" :)
 
That's a very intriguing question...

I've heard and read that long-distance big-rig truck drivers, and people who spend a lot of time on tractors or other heavy equipment, can incur kidney damage from absorbing the vibrations associated with those rigs.

Maybe long-term exposure to powerful bass frequencies can damage the brain; I don't know. I'd be interested to see the results of a comprehensive study.
 
Saw Weedeater a couple of years ago, front and center of two Sunn’s and two 2x15’s. My WordBlitz scores have tanked ever since :D I visited the IHOP nearby after the show and could barely hear my waitress over the ringing. I can believe something like that over time could scramble someone’s eggs. No more for this skinny old coot.

View attachment 4065024
Seriously, two of these heads?
E03A2A71-9966-4914-9595-BCB2EB7FAA66.jpeg
They’re only 150 watts into 4 ohms. I think you might have been messed up by the entire band or what was coming out of the PA.
 
That's a very intriguing question...

I've heard and read that long-distance big-rig truck drivers, and people who spend a lot of time on tractors or other heavy equipment, can incur kidney damage from absorbing the vibrations associated with those rigs.

Maybe long-term exposure to powerful bass frequencies can damage the brain; I don't know. I'd be interested to see the results of a comprehensive study.
I can’t imagine what jackhammer operators go through.
 
Repeated low-intensity impacts, like pulled sparring punches, can cause brain injury, but that's because of the brain hitting against the skull.

Explosions can also cause brain injury:

(Effects of Low-Level Blast Exposure on the Nervous System: Is There Really a Controversy?)
"...Questions have also emerged as to whether pathophysiologically blast-related TBI is different from the type of non-blast TBI (nbTBI) typical of civilian trauma where injury is caused by inertial and rotational forces along with the effects of blunt impact (37, 38). The most direct physical effects of these forces are bleeding, direct tissue damage, and mechanical shear stress along white matter tracts, which in turn leads to activation of a variety of pathophysiological cascades that are associated with further tissue damage (37, 39). Blast injuries by contrast result from a pressure wave generated at a distance and transmitted though air, which may induce stresses in the brain without significant global motions being imparted. Damage to the nervous system is thought to occur through biophysical mechanisms related to the traveling shock wave’s interaction with the brain (4042), although it has also been suggested that a blast wave striking the body can induce oscillating pressure waves, which can be transmitted through the systemic circulation to the brain (12, 43)..."

Loud bass frequencies can vibrate things visibly. If I'm listening to music in the car with loud bass, the rearview mirrors vibrate enough to be blurry, without a subwoofer, just on little factory economy car speakers. It's small impacts compared to boxing or explosives, but what about the cumulative effect with enough time? And with a louder bass amp?

Is it not commonly known that bassists are getting brain injuries just because of how weird the bassists already were? Is the SVT making me r-worded or is it not the SVT's fault?
Yes, but if we’re talking low frequencies, how does this explain certain guitar players?
 
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Seriously, two of these heads?
View attachment 4065127 They’re only 150 watts into 4 ohms. I think you might have been messed up by the entire band or what was coming out of the PA.

I can only attest to my personal experience. Granted the guitarist was dealing a full Marshall stack, everything was downtuned, and it was a small-medium indoor venue. But it felt like the loudest show I’ve ever attended. And I’ve seen Sleep twice.

It was “what did I just do” stupid loud.
 
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