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Why We Faint (When Other Animals Don't)

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Channel: MinuteEarth
Categories: Biology   |   Psychology   |   Science  
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Humans are the only animals known to faint due to triggers like shock, fear, or pain; this is due to a combination of our massive brains and upright stance.

LEARN MORE
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To learn more about this topic, start your googling with these keywords:
"Fight or flight": an instinctive physiological response to a threatening situation that readies animals (including humans) to either resist forcibly or escape
Fainting: loss of consciousness caused by a temporary lack of oxygen to the brain, also known as syncope.
Vasovagal syncope: a type of fainting that happens when your body overreacts to an emotional trigger like being in danger, seeing blood, or even just hearing some shocking news.
Tonic immobility: an instinctive physiological response to a threatening situation that causes some animals to relax their muscles and freeze in place, sometimes causing them to fall over
Jump scare: a technique often used in horror films meant to scare the audience with a sudden change on screen, usually paired with a loud sound

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CREDITS
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Julin Gustavo Gmez (@thejuliangomez) | Script Writer, Narrator, and Director
Josh Taira | Illustration, Video Editing, and Animation
Nathaniel Schroeder | Music

MinuteEarth is produced by Neptune Studios LLC
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Sarah Berman Arcadi Garcia Rius
David Goldenberg Julin Gustavo Gmez
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Peter Reich Ever Salazar Kate Yoshida

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Piano Jump Scare Stinger by TheSoundFXGuy_YT of freesound.org
https://freesound.org/people/TheSoundFXGuy_YT/sounds/534218/
Licensed under CC BY 3.0 https://creativecommons.org/licenses/by/3.0/

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REFERENCES
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Alboni, Paolo, and Marco Alboni. "Origin and Evolution of the Vasovagal Reflex." Vasovagal Syncope. Springer, Cham, 2015. 3-17.

Alboni, P., Alboni, M. Typical vasovagal syncope as a defense mechanism for the heart by contrasting sympathetic overactivity. Clin Auton Res 27, 253261 (2017). https://doi.org/10.1007/s10286-017-0446-2

Blanc, Jean-Jacques, Paolo Alboni, and David G. Benditt. "Vasovagal syncope in humans and protective reactions in animals." Ep Europace 17.3 (2015): 345-349.

Bracha, H., Bienvenu, O. & Person, D. Evolution and fear-fainting. Clin Auton Res 16, 299 (2006). https://doi.org/10.1007/s10286-006-0359-y

Buckey JC, Peshock RM, Blomqvist CG. Deep venous contribution to hydrostatic blood volume change in the human leg. Am J Cardiol. 1988 Sep 1;62(7):449-53. https://doi.org/10.1016/0002-9149(88)90976-9.

Furst, Branko. "The Effect of Gravity and Upright Posture on Circulation." The Heart and Circulation. Springer, Cham, 2020. 319-341.

Kozlowska K, Walker P, McLean L, Carrive P. Fear and the Defense Cascade: Clinical Implications and Management. Harv Rev Psychiatry. 2015 Jul-Aug;23(4):263-87. https://doi.org/10.1097/HRP.0000000000000065.

Roelofs, Karin. "Freeze for action: neurobiological mechanisms in animal and human freezing." Philosophical Transactions of the Royal Society B: Biological Sciences 372.1718 (2017): 20160206.

Sheldon, Robert S., and Roopinder K. Sandhu. "The search for the genes of vasovagal syncope." Frontiers in cardiovascular medicine 6 (2019): 175.

Sun, Benjamin C., Jennifer A. Emond, and Carlos A. Camargo Jr. "Direct medical costs of syncope-related hospitalizations in the United States." The American journal of cardiology 95.5 (2005): 668-671.

van Dijk JG. Fainting in animals. Clin Auton Res. 2003 Aug;13(4):247-55. https://doi.org/10.1007/s10286-003-0099-1.

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