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[[File:Vipera_aspis_aspis.jpg|thumb|alt=Vipera Aspis.|According to the Snake Detection Hypothesis, venomous and life-threatening snakes, including [[asp viper]]s, were crucial for the evolution of primates' visual systems.]]
The '''snake detection theory (SDT)''',<ref>{{cite journal|last1=Isbell|first1=Lynne A.|authorlink=Lynne Isbell|title=Snakes as agents of evolutionary change in primate brains|journal=Journal of Human Evolution|date=1 July 2006|volume=51|issue=1|pages=1–35|doi=10.1016/j.jhevol.2005.12.012|pmid=16545427|citeseerx=10.1.1.458.2574}}</ref><ref>{{cite book|last1=Isbell|first1=Lynne A.|title=The Fruit, the Tree, and the Serpent|date=2009|url=https://books.google.com/books?id=yKzIuw4YBCoC&q=The+Fruit%2C+the+Tree%2C+and+the+Serpent+isbell&pg=PR7|publisher=Harvard University Press|language=en|isbn=9780674033016}}</ref><ref name=":0">{{Cite web |last1=Allman Updyke |first1=Erin |last2=Welsh |first2=Erin |name-list-style=and |year=2022 |orig-date=31/05/2022 |title=Episode 97 Snake Venoms: Collateral Damage |url=https://thispodcastwillkillyou.com/2022/05/31/episode-97-snake-venoms-collateral-damage/ |website=This Podcast Will Kill You |publisher=Exactly Right Network}}</ref> also sometimes called the '''snake detection hypothesis''', suggests that [[snakes]] contributed to the evolution of visual systems
According to the theory, predatory pressure on early primate populations from snakes selected individuals who were best able to
recognize them, improving their survival chances and therefore transferring such skill to their offspring. From this point of view, snakes were responsible for the modification and expansion of primate visual systems which made [[visual perception|vision]] the most developed sensory interface with the external environment for modern primates.
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