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Dr Strangelove
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quote: Originally posted by Graag
Depression is existentialist angst, there is no 'reason' for it. Weed just shows how meaningless existence is, and lets you laugh at it. Trouble is, when you ain't laughing, it ain't funny. In fact its a bit ****. |
Major depression is almost certainly a physiologic disease, because it has a very high genetic factor. Environmental factors, such as drug use, can trigger episodes though.
Less severe forms of depressive like illnesss occur as a result of major stressors in people who do not have the genetic predisposition. This is called "situational depression" or adult situational adjustment disorder. Drug use can be a contributing factor in this illness too.
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Dr Strangelove
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quote: Originally posted by Graag
Hmmm. Inaaresting words, but what evidence is there it is genetic? I would suggest if people with depression have depressed parents, it is more likely their environement causes the depression.
Either way, depression itself cannot be compared to a disease like flu. You don't catch it. |
Studies have been done on identical twins seperated at birth and raised by different families. The concordance factor for the lifetime risk of major depression for the (seperated) identical twins was a phenomenal 85%. Concordance for fraternal twins and siblings was around 40%. The concordance factor for siblings raised together was only a little higher, 55%.
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Dr Strangelove
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quote: Originally posted by Graag
In the case of weed, the majority want it legal. |
Consider this, if you legalize it, then why shouldn't you let corporations get a piece of the drug trade. Trust me on this, if you let the American Tobacco Co., Phillip Morris, or R.J. Reynolds get ahold of the drug trade civilization won't stand a chance.
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Graag
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London
Nov 1999 time: 05:24
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quote: Studies have been done on identical twins seperated at birth and raised by different families. The concordance factor for the lifetime risk of major depression for the (seperated) identical twins was a phenomenal 85%. Concordance for fraternal twins and siblings was around 40%. The concordance factor for siblings raised together was only a little higher, 55%. |
Wow. Impressive figures. Question 1: what is concordense?
Question 2: How many children raised by foster parents are depressed anyway?
quote: Consider this, if you legalize it, then why shouldn't you let corporations get a piece of the drug trade. Trust me on this, if you let the American Tobacco Co., Phillip Morris, or R.J. Reynolds get ahold of the drug trade civilization won't stand a chance. |
Fair point, perhaps civilisation needs it. Drug use (or rather, abuse) is slowly increasing year on year, back as far records start. Something has to give eventually, perhaps Mr Morris should just speed up the inevitibale.
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loinburger
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Sweet Sauce Jones
Jul 1999 time: 00:24
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quote: Originally posted by Graag
Loinburger, apologies, but you'll have to answer question 1 and explain the whole concordance thing and first, I'm still confused. |
It means (among other things, but I'm just giving you the most relevant definition), "Genetics. The presence of a given trait in both members of a pair of twins." In other words, with an 85% concordance rate in identical twins, if one twin suffered from depression then there would be an 85% chance that the other would (eventually) suffer from depression. For siblings and fraternal twins (siblings are genetically equivalent to fraternal twins), if one sibling suffered from depression, then there would be a 40% chance that the other would (eventually) suffer from depression.
Since the twins/siblings were separated at birth, they would not be under identical environmental influences (other than the common factor that they're both in foster homes), so while it's possible that the test subjects were suffering from environmental depression and not genetic depression this would not account for the dramatic increase in the concordance of identical twins over the concordance of siblings, i.e. if 20% of all test subjects suffered from environmental depression then this would still mean that the identical twins (who are much more similar genetically than siblings) had a 40% concordance increase (which can only be attributed to genetics, since that is the only variable). The reason (I assume) that concordance is higher in non-separated siblings than in separated sibligs is that having a sibling suffer from depression adds a severe stressor to the life of the sibling who is not suffering, which can either trigger genetic depression or which can cause environmental depression.
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