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Some studies have found that humans can detect snake images before subjective visual perception.<ref>{{cite journal|last1=Ohman|first1=A.|last2=Soares|first2=J. J.|title=On the automatic nature of phobic fear: conditioned electrodermal responses to masked fear-relevant stimuli|journal=Journal of Abnormal Psychology|date=1993|volume=102|issue=1|pages=121–132|pmid=8436688|issn=0021-843X|doi=10.1037/0021-843X.102.1.121}}</ref> However, the pre-conscious detection of snake stimuli is still under debate by the scientific community.<ref>{{cite journal|last1=Grassini|first1=Simone|last2=Holm|first2=Suvi K.|last3=Railo|first3=Henry|last4=Koivisto|first4=Mika|title=Who is afraid of the invisible snake? Subjective visual awareness modulates posterior brain activity for evolutionarily threatening stimuli|journal=Biological Psychology|date=1 December 2016|volume=121|issue=Part A|pages=53–61|doi=10.1016/j.biopsycho.2016.10.007|pmid=27760371|s2cid=9516831}}</ref>
Regardless, snakes images have been experimentally demonstrated to be detected more rapidly compared to other fear-relevant stimuli: empirical evidences have shown that snakes are more rapidly detected compared to [[spiders]]; according to the snake detection theory this is because the [[arachnid]]s were, historically, a less relevant threat to primates.<ref>{{cite journal|last1=Öhman|first1=Arne|last2=Soares|first2=Sandra C.|last3=Juth|first3=Pernilla|last4=Lindström|first4=Björn|last5=Esteves|first5=Francisco|title=Evolutionary derived modulations of attention to two common fear stimuli: Serpents and hostile humans|journal=Journal of Cognitive Psychology|date=1 February 2012|volume=24|issue=1|pages=17–32|doi=10.1080/20445911.2011.629603|s2cid=146142767|issn=2044-5911}}</ref>
Snake stimuli are particularly distracting during perceptual tasks, suggesting that the brain preferentially processes snake stimuli, even when attentional processes are demanded by other targets.<ref>{{cite journal|last1=Soares|first1=Sandra C.|title=The lurking snake in the grass: interference of snake stimuli in visually taxing conditions|journal=Evolutionary Psychology|date=15 April 2012|volume=10|issue=2|pages=187–197|doi=10.1177/147470491201000202|pmid=22947633|s2cid=34814663|issn=1474-7049|doi-access=free|hdl=10316/102719|hdl-access=free|pmc=10481044}}</ref>
Enhanced snake detection has also been found in young children.<ref>{{cite journal|last1=LoBue|first1=Vanessa|last2=DeLoache|first2=Judy S.|title=Detecting the Snake in the Grass: Attention to Fear-Relevant Stimuli by Adults and Young Children|journal=Psychological Science|date=1 March 2008|volume=19|issue=3|pages=284–289|doi=10.1111/j.1467-9280.2008.02081.x|pmid=18315802|s2cid=12776572|language=en|issn=0956-7976}}</ref>
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