Dopamine shown to induce both desire and dread


	Dopamine shown to induce both desire and dread

seaj11

7-12-2008 5:30 PM

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psychology, brain, neurology, drugs, fear, addiction, science

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://www.clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/c0ddf239-0f64-444f-b140-8f0d27a7fd8e/55711822-384A-40D0-B64D-02F42E067B34/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.kurzweilai.net/news/news_single.html?id=9006" href="http://www.kurzweilai.net/news/news_single.html?id=9006" style="font-size: 11px;">www.kurzweilai.net</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.kurzweilai.net/news/news_single.html?id=9006"><SPAN class="title">Dopamine shown to induce both desire and dread</SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.kurzweilai.net/news/news_single.html?id=9006"><P>
KurzweilAI.net, 
July 9, 2008
</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.kurzweilai.net/news/news_single.html?id=9006"><DIV>University of Michigan <A class="thought" href="javascript:loadBrain('Research')">research</A>ers have found that <A class="thought" href="javascript:loadBrain('Dopamine')">dopamine</A>, the <A class="thought" href="javascript:loadBrain('Neurotransmitter')">neurotransmitter</A> associated with motivation and positive rewards, can also promote negative feeling like fear and dread.
</DIV></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.kurzweilai.net/news/news_single.html?id=9006"><DIV>
The <A class="thought" href="javascript:loadBrain('Research')">research</A>ers had previously found that desire and dread functions were anatomically close together in the <A class="thought" href="javascript:loadBrain('Nucleus')">nucleus</A> accumbens (a tiny section of the <A class="thought" href="javascript:loadBrain('Brain')">brain</A>--one-fifth of an inch long--associated with desire and reward). In their new <A class="thought" href="javascript:loadBrain('Research')">research</A>, they found that the effect of <A class="thought" href="javascript:loadBrain('Dopamine')">dopamine</A> depended on where it was concentrated in the <A class="thought" href="javascript:loadBrain('Nucleus')">nucleus</A> accumbens. Injections to the front of the <A class="thought" href="javascript:loadBrain('Nucleus')">nucleus</A> accumbens caused rats to eat three times as much food as normal, but injections to the back caused them to display fearful behavior normally shown in response to a predator.
</DIV></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.kurzweilai.net/news/news_single.html?id=9006"><DIV>
It was previously assumed that fear and desire came from different <A class="thought" href="javascript:loadBrain('Neurotransmitter')">neurotransmitter</A>s, but the new study shows that anatomy alone can determine a single <A class="thought" href="javascript:loadBrain('Neurotransmitter')">neurotransmitter</A>'s role.
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