Your friend cuts his thumb and laughs, and you are the one who ends up on the kitchen floor. We follow that strange reflex from a heart monitor to Ulysses S. Grant’s charred steaks, a Baltimore survey and a 7,000-year-old grave in Germany, and find out who it once protected.
0:00 His Blood, Your Floor
0:27 The Heart Drops First
1:25 The General Who Hated Blood
3:16 It Runs in the Family
3:59 The Simple Answer
5:18 Only Humans Want You Alive
6:00 The Raid at Dawn
7:04 The Baltimore Test
8:19 The Grave in Germany
9:15 Why Only Some
9:59 Back in the Kitchen
Sources:
• Blood phobia: about 3 to 4% of people, up to 80% faint or nearly faint, starts in childhood, runs in families (one estimate: 59% heritable); ketchup or paint can trigger it: https://en.wikipedia.org/wiki/Blood-injection-injury_type_phobia
• Heart rate rises, then falls; unique among anxiety disorders; surgery films as triggers: Ritz, Meuret and Ayala, Int J Psychophysiol 2010. https://pmc.ncbi.nlm.nih.gov/articles/PMC6688615/ The full two-step pattern shows up in a minority of lab cases: Ritz et al., Behav Res Ther 2013. https://doi.org/10.1016/j.brat.2013.03.011
• Near-fainting during a surgery film: Ritz et al., Psychosom Med 2005. https://doi.org/10.1097/01.psy.0000170339.06281.07
• Baltimore sample, median onset at 5.5 years, more common in women: Bienvenu and Eaton, Psychol Med 1998. https://doi.org/10.1017/s0033291798007144
• Grant and charred meat: https://www.pbs.org/warrior/content/bio/grant.html “I detested the trade”: Personal Memoirs of U. S. Grant. https://www.gutenberg.org/files/4367/4367-h/4367-h.htm Fort Donelson: https://en.wikipedia.org/wiki/Battle_of_Fort_Donelson Shiloh losses: National Park Civil War Series. https://npshistory.com/publications/civil_war_series/22/sec16.htm
• The blood-loss idea, and fainting as a way to be taken captive rather than killed: The Conversation, 2016. https://theconversation.com/fight-flight-or-faint-why-some-people-pass-out-when-they-see-blood-or-feel-pain-57348
• Fear-fainting as a human answer to violence from other humans; “freeze, flight, fight, fright, faint”: Bracha, CNS Spectr 2004. https://doi.org/10.1017/s1092852900001954 Not reported in fires, floods or predator attacks: Bracha 2006. https://pmc.ncbi.nlm.nih.gov/articles/PMC7130737/ A hypothesis, not a settled finding.
• Women 27 to 49: 3.3%; over 50: 1.1%; men 0.8% and 0.7%: Bracha, Bienvenu and Eaton, J Affect Disord 2007. https://doi.org/10.1016/j.jad.2006.06.014 One survey; the authors call it one source of support.
• Skull with two blows, about 430,000 years old: Sala et al., PLoS One 2015. https://doi.org/10.1371/journal.pone.0126589
• Schöneck-Kilianstädten mass grave, 26 people, young women missing: Meyer et al., PNAS 2015. https://pmc.ncbi.nlm.nih.gov/articles/PMC4568710/ Abduction is the authors’ interpretation.
People, studies and places mentioned:
• Ulysses S. Grant and Robert E. Lee; Point Pleasant, Fort Donelson, Shiloh, Appomattox; a Baltimore health study; Sima de los Huesos, Spain; Schöneck-Kilianstädten, Germany.
Animation by StickMankind
Narration: Brian — Deep, Resonant and Comforting
AI-generated stick-figure illustrations and an AI voice (Brian); illustrations are reconstructions, and no generated image is presented as documentary footage. This video is not medical advice.
#HumanEvolution #HumanBody #Fainting #StickMankind
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