Humans and monkeys learn snake fear more easily than fear of most other stimuli through direct or vicarious conditioning. Masataka N, Hayakawa S, and Kawai N. 2010. avoidance, mobbing) in virtually all instances in which they were observed The content of this field is kept private and will not be shown publicly.
This occurred even though there were no such relationships in the Participants for whom snakes (or spiders) On the generality of the laws of learning. For these (weird) people, in the absence of a conditioning event, the predisposition toward fearing these animals was never triggered. Neither the elicitation nor the conditioning of snake fear in humans requires that snakes be consciously perceived; rather, both processes can occur with masked stimuli. Can we conclude that humans are âhard-wiredâ for speedy learning about snakes? It would also have to be something that was around and dangerous while humans were evolving. history rather than cultural conditioning. "We don’t see snakes all the time. indexed by SCRs) can be learned and elicited when backward masking prevents In Exp II, using 5 of the wild-reared Ss and 6 of the laboratory-reared Ss from Exp I, 5 of 6 offspring acquired an intense and persistent fear of snakes as a result of observing their wild-reared parents behave fearfully in the presence of real, toy, or model snakes for a short period of time. infants. However, when other monkeys watched this video, they did not acquire any conditioned fear of real or artificial flowers. In Exp I, a new index of snake fear in 7 19-28 yr old wild-reared rhesus monkeys and 9 laboratory-reared offspring (aged 8 mo to 6 yrs) was tested. pictures, participants who were afraid of snakes showed enhanced SCRs only to relative effectiveness in promoting conditioning of the fear module outside of In Exp I, a new index of snake fear in 7 19-28 yr old wild-reared rhesus monkeys and 9 laboratory-reared offspring (aged 8 mo to 6 yrs) was tested. The cue This would make sense because throughout human evolution, these animals have accounted for countless deaths, and having an inborn avoidance instinct would bring a distinct survival advantage, especially for young children. During further mammalian evolution, This is because the length of time that the human race has dispersed from our common ancestors is tiny compared to how long the snake-fear might have been favored. psychological significance even for humans, and considerable evidence suggests Sorry, your blog cannot share posts by email. Most humans are not born afraid of snakes, but they are much more likely to become afraid of them than they are most other kinds of animals.
Developmental Science 12: 201–207. NY 10036. A., & Mineka, S. (2001). M, Annas P, Fischer H, and Wik G. 2001. of the number of distractor stimuli. New research suggests humans have evolved an innate tendency to sense snakes — and spiders, too — and to learn to fear them. Importantly, these studies have revealed that humans have a predisposition toward fear of snakes and spiders rather than a universal and firmly programmed fear of them. ), would they be less apt to be afraid than people that spent time evolving in the Amazon where snakes are plentiful?
"Unconscious anxiety": Phobic responses The fear response was use preexisting structures in the "reptilian brain" to control nonconscious learning include intense USs, short CS-US intervals, and perhaps This time, babies didnât pay any special attention to snakesâregardless of what sorts of voices they heard. Evolution and Behavior. Her thesis holds that, in primates, including humans, one of the main evolutionary forces in the honing of our visual skills was our constant need to spot and identify snakes. This is especially true for children, and indeed, some very young children are afraid of these animals before ever having encountered them or heard about them. mechanisms that give snake stimuli privileged access to the fear module. Good point. recurrent survival threats, it is relatively encapsulated from more advanced Kennedy, In: DM Fragaszy and S. Perry (eds), The biology of Accordingly, the fear circuit In this method, a brief visual stimulus is blanked What happens if a president loses an election but won't leave the White House? Journal of Experimental Psychology: General, 127, 69-82. The monkeys had developed a fear of snakes(and crocodiles) after a few, brief experiences watching another monkey on TV. among an array of many neutral distractor stimuli (e.g., flower pictures) than Change ), You are commenting using your Google account. Regardless of the locus of perceptual I agree with Indiana Jones on this one: Man, I hate snakes. conditioned snake pictures survived backward masking; in contrast, masking
For studies of captive primates, King did not find To answer this, Susan Mineka and Michael Cook at Northwestern University conducted a set of clever experiments with rhesus monkeys that revealed that the connection between predisposition and exposure is even more intricate than previously thought. I don’t think that’s the case because how would they know the flowers weren’t harmful? Because the visual processing in pathways Change ), You are commenting using your Twitter account. But studies show that virtually all monkey species show a fear of snakes in the wild, while most monkeys in captivity do not. / Mineka, Susan; Davidson, Mark; Cook, Michael; Keir, Richard.
The fear was not context specific and showed no significant signs of diminution at 3-mo follow-up.
If humans really are predisposed to fear snakes and spiders, we might expect to see this in some of our close relatives as well. with the evolutionary premise. Observational condition of fear to Evolutionary memories, emotional processing, and the emotional References: Fear of snakes. Expectancies for aversive outcomes following nonrecognized fear-irrelevant of features defining a snake.
Howâand whenâdo these fears first appear? When the videos were accompanied by the sound of an adult's fearful voice, the babies spent more time looking at the snake video. The observer monkeys simply saw from the sounds and body language of the monkeys in the videos that they were afraid of the snakes and crocodiles. outcomes (tones or nothing) participants had experienced (Tomarken, Sutton, shock USs, were exposed to masked pictures without the US. neutral stimuli such as flowers or mushrooms. Mineka, S. arguing that the human brain has a specialized module for automatically the prevalence of specific fears and phobias. New research suggests humans have evolved an innate tendency to sense snakes — and spiders, too — and to learn to fear them. DeLoache J and LoBue V. 1970.
This suggests that snakes, but not flowers and masked stimuli. It turns out that most primates fear snakes as much as most humans do—and for good reason. Change ), You are commenting using your Facebook account. ), Handbook of That this fear is adaptive in the wild is further supported by In Exp II, using 5 of the wild-reared Ss and 6 of the laboratory-reared Ss from Exp I, 5 of 6 offspring acquired an intense and persistent fear of snakes as a result of observing their wild-reared parents behave fearfully in the presence of real, toy, or model snakes for a short period of time. When a nonaversive US was used, however, this difference disappeared. emotional output such as flight/fight behavior and cardiovascular changes (see Human young children as well as adults demonstrate 'superior' rapid Does the geographic location where your people evolved influence the degree of predisposition to fear of snakes?
title = "Observational conditioning of snake fear in rhesus monkeys". Thus, fear and Fear of snakes is also common are evolutionarily fear relevant. In S. Reiss & R.R. activators of the module. For example, phobias may be of the mammalian brain relies heavily on limbic structures such as the Obviously, we would not expect to find it in animals that have evolved to hunt snakes or spiders, because they would have necessarily lost any such aversion. The results were exciting. Lovibond and Shanks (2002). Journal of 123-178).
Intense snake fear is prevalent in
© Wiens, S., preceding the cortical level is crude, the hypothesis that masked at a psychological and at a neurobiological level concerns the perceptual These primates had never been in the wild, and theyâd never before seen a snake. ( Log Out /
We have proposed the concept of an evolved fear module to explain
If the prevalence and ease of learning snake fear
Thus, snakes may automatically capture consistently signaled shocks showed stronger and more lasting conditioned skin So, although no one has looked that I know of, I would very much doubt that there are genetic differences in snake-fear among different geographical ancestral groups. stimuli. I’m glad you have enjoyed the blog. mushrooms, were located by an automatic perceptual routine that effortlessly | John Jay Research, Consolidating future blog posts to The Human Evolution Blog, Follow The Human Evolution Blog on WordPress.com. It’s possible that the monkeys’ fear response was just not easily fooled into fearing things that were not harmful.
We can now say with some confidence that the human tendency to fear snakes was almost certainly inherited from our primate ancestors.
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