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the development of aggression and prosocial behavior in

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than <strong>the</strong> causes <strong>of</strong> human <strong>aggression</strong>. Some <strong>of</strong> <strong>the</strong> causes, such as frustration <strong>and</strong> poverty, are<br />

attributed to factors <strong>in</strong> <strong>the</strong> immediate environment. O<strong>the</strong>r underly<strong>in</strong>g causes can be related to an<br />

<strong>in</strong>dividual's prior experience <strong>and</strong> learn<strong>in</strong>g. Some suggest <strong>the</strong> orig<strong>in</strong>s <strong>of</strong> <strong>aggression</strong> emerge from our<br />

evolutionary past.<br />

It has been suggested that <strong>aggression</strong> is an important evolutionary mechanism by which <strong>the</strong><br />

characteristics <strong>of</strong> a species' most successful <strong>in</strong>dividuals are passed on to <strong>the</strong> next generation.<br />

S<strong>in</strong>ce <strong>in</strong>dividuals compete with o<strong>the</strong>r <strong>in</strong>dividuals for scarce resources necessary for survival <strong>and</strong><br />

reproduction, evolution would seem to favor competitive <strong>and</strong> selfish <strong>behavior</strong>s. Accord<strong>in</strong>g to this<br />

perspective, <strong>aggression</strong> is a natural <strong>and</strong> necessary mechanism which automatically accompanies<br />

<strong>the</strong> biological maturation <strong>of</strong> <strong>the</strong> young.<br />

A second explanation, proposed by social learn<strong>in</strong>g <strong>the</strong>orists, suggests that aggressive <strong>behavior</strong> is<br />

learned because <strong>of</strong> <strong>the</strong> rewards obta<strong>in</strong>ed by <strong>the</strong> aggressor. A third explanation proposes that<br />

children are taught to model <strong>the</strong> aggressive <strong>behavior</strong> characteriz<strong>in</strong>g <strong>the</strong>ir environments. More<br />

aggressive forms <strong>of</strong> <strong>behavior</strong> are exhibited by children who have been exposed to more frequent<br />

outbursts <strong>of</strong> <strong>aggression</strong> <strong>in</strong> <strong>the</strong>ir environments. Once children are old enough to underst<strong>and</strong> that<br />

<strong>the</strong>y can get <strong>the</strong>ir way by harm<strong>in</strong>g o<strong>the</strong>rs, <strong>the</strong>y learn from adults both specific types <strong>of</strong> <strong>aggression</strong><br />

<strong>and</strong> <strong>the</strong> belief that aggressive <strong>behavior</strong> is acceptable.<br />

As with o<strong>the</strong>r forms <strong>of</strong> complex human <strong>behavior</strong>, pos<strong>in</strong>g a biological-evolutionary perspective<br />

aga<strong>in</strong>st environmental-learn<strong>in</strong>g <strong>the</strong>ories <strong>of</strong> <strong>behavior</strong> is not sufficient for underst<strong>and</strong><strong>in</strong>g. Ra<strong>the</strong>r,<br />

<strong>aggression</strong> should be viewed as a form <strong>of</strong> <strong>behavior</strong> that evolves from an <strong>in</strong>teraction between<br />

deep-seated biological predispositions <strong>and</strong> culturally organized environmental <strong>in</strong>fluences. Nor can<br />

<strong>aggression</strong> be understood without look<strong>in</strong>g at <strong>the</strong> various mechanisms societies have used to<br />

control <strong>and</strong> regulate <strong>the</strong> level <strong>of</strong> <strong>aggression</strong> shown by its members.<br />

Controll<strong>in</strong>g <strong>aggression</strong> <strong>in</strong> young children<br />

Researchers have focused on two mechanisms used to control human <strong>aggression</strong>; <strong>the</strong> evolution <strong>of</strong><br />

hierarchical systems <strong>of</strong> control, <strong>and</strong> <strong>the</strong> use <strong>of</strong> reward <strong>and</strong> punishment.<br />

Mechanisms limit<strong>in</strong>g <strong>aggression</strong> are widespread among animal species <strong>and</strong> <strong>in</strong>clude social<br />

structures that place members <strong>in</strong> a dom<strong>in</strong>ant/subord<strong>in</strong>ate hierarchy. Dom<strong>in</strong>ance hierarchies<br />

where some animals are dom<strong>in</strong>ant <strong>and</strong> o<strong>the</strong>rs are subord<strong>in</strong>ate regulate <strong>in</strong>teraction among<br />

members <strong>of</strong> <strong>the</strong> same species. Dom<strong>in</strong>ant animals need only to threaten without attack<strong>in</strong>g to<br />

achieve <strong>the</strong>ir goals, thus dim<strong>in</strong>ish<strong>in</strong>g <strong>the</strong> frequency <strong>of</strong> attack. In a similar fashion, child<br />

<strong>development</strong> researchers have observed a close connection between <strong>aggression</strong> <strong>and</strong> <strong>the</strong> formation<br />

<strong>of</strong> dom<strong>in</strong>ance hierarchies among 3- <strong>and</strong> 4-year old children <strong>in</strong> preschool sett<strong>in</strong>gs. Dom<strong>in</strong>ance<br />

hierarchies <strong>in</strong>fluenced who would fight with whom <strong>and</strong> under what circumstances.<br />

Although cross species similarities exist, it is important to recognize <strong>the</strong> unique attributes that<br />

dist<strong>in</strong>guish <strong>the</strong> patterns <strong>and</strong> control <strong>of</strong> human <strong>aggression</strong>. While <strong>the</strong> youth <strong>of</strong> o<strong>the</strong>r species must<br />

rely entirely on dom<strong>in</strong>ance hierarchies, parents <strong>and</strong> older sibl<strong>in</strong>gs <strong>of</strong> human <strong>of</strong>fspr<strong>in</strong>g set limits to<br />

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