PT49 S2 Q23

vamos
Posts: 47
Joined: Sat Jan 15, 2011 2:50 am

PT49 S2 Q23

Postby vamos » Sat Jan 15, 2011 3:26 am

I'm not 100% sold on the correct answer. This argument is supposedly flawed because of its circular reasoning, but I'm having a little trouble grasping the circularity taking place. It seems to me like the flaw in the argument is a lack of evidence for the conclusion.

tomwatts
Posts: 1551
Joined: Wed Sep 16, 2009 12:01 am

Re: PT49 S2 Q23

Postby tomwatts » Sat Jan 15, 2011 11:17 pm

Well, there isn't a lack of evidence per se. The second sentence begins with, "As evidence of this." Everything after the first sentence is supposed to be evidence for the first sentence. However, the evidence seems already to be assuming the conclusion. It says that even with "all that" — that is, a complete scientific account of the physical aspects of some action — then "we would obviously still not truly comprehend the action or know why it occurred." But why not? Well, because human behavior cannot be fully understand without inquiring into nonphysical aspects of persons. Uh, but wait. That's the conclusion that we were trying to justify. This evidence is only legitimate evidence if the conclusion is already true. Well, drat. Circular.

vamos
Posts: 47
Joined: Sat Jan 15, 2011 2:50 am

Re: PT49 S2 Q23

Postby vamos » Sun Jan 16, 2011 12:34 am

Thanks again. When reviewing this question I found that I could diagram the stimulus.

C: Human Behavior Understood --> Nonphysical Aspects

P: ~Nonphysical Aspects --> ~Human Behavior Understood

In this case the premise restates the conclusion as its contrapositive, and thus presupposes what it seeks to establish.




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