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TOPIC HISTORY

Does Natural Selection Promote Genes Associated with Violence?



Statements

Statement Type Title Description Proposed Probability Author History Last Updated
STATEMENT In-group aggression

In-group aggression differs from out-group aggression. It is characteristically less lethal than out-group aggression and can act to jeopardise the survival of the group.

Further, aggression is a high energy, high risk trait and following N2 need only be promoted by the particular circumstances in which it does enhance reproductive success i.e. resource scarcity. Otherwise may be negatively correlated to fitness.

1.0 Missingenius Details 2016-09-28 22:27:34.0
CITATION Inhibitory mechanisms to aggression

Multiple species including ours have evolved inhibitory (seretogenic) mechanisms to aggression. 

Firstly this suggests that aggression is not unreservedly correlated to fitness and secondly, demonstrates that genes associated with a lack of aggression are (also) promoted by natural selection. 

By way of example; 
https://www.ncbi.nlm.nih.gov/pubmed/23660028 

Neuroimage. 2013 Oct 1;79:264-74. doi: 10.1016/j.neuroimage.2013.04.104. Epub 2013 May 6.

Inhibitory control and trait aggression: neural and behavioral insights using the emotional stop signal task!

 

 

1.0 Missingenius Details 2016-09-28 22:27:34.0
STATEMENT Natural selection promotes genes associated with violence and aggression 1.0 NickAdams Details 2016-09-28 22:27:34.0
CITATION Aggression can increase evolutionary fitness

There are multiple definitions that exist of 'fitness' in the evolutionary context, as explored in https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0CCQQFjABahUKEwiFsd-AjPDHAhUHlogKHTdmDfc&url=https%3A%2F%2Foid.wharton.upenn.edu%2Ffiles%2F%3Fwhdmsaction%3Dpublic%3Amain.file%26fileID%3D5444&usg=AFQjCNGp1KQpRoCbkAehYLZuJtQvyMSCiA&bvm=bv.102537793,d.cGU&cad=rja.

 In this graph, a gene associated with fitness is one that leads to a greater number of successful offspring. From the above link, a more explicit measure of fitness: "Waddington's characterization of fitness as 'the capacity to contribute offspring to the next generation' (1957, p. 109) is a standard conception of fitness which is explicated by defining fitness, in the absolute sense, as an expectation. Crow & Kimura define it as follows: We define fitness, or selective value, as the expected number of progeny per parent. [...] (Crow & Kimura, 1970, p. 178)."

1.0 NickAdams Details 2016-09-28 22:27:34.0
STATEMENT There exists specific, recurring situations where aggression increases fitness 1.0 NickAdams Details 2016-09-28 22:27:34.0
CITATION Buss, David and Todd Shackelford. Human aggression in evolutionary psychological perspective

http://www.homepage.psy.utexas.edu/HomePage/group/BussLAB/pdffiles/human%20aggression-1997-clin%20psych%20rev.pdf  

This article puts forward seven different "leading candidates for adaptive problems to which aggression might be an evolved solution." Multiple nodes into n2 were adapted from this article, with some additions. 

1.0 NickAdams Details 2016-09-28 22:27:34.0