Mental cause fallacy:

Definition Example
When the effects of a belief in a thing are assumed to be evidence for the existence of that thing. Those who believe they are intelligent, out-perform on IQ tests those who think they are not intelligent. Therefore they are more intelligent.
  Notes
This fallacy is essentially that of ignoring the placebo effect or other effects of belief.

Case Study One

Many of those who believe in homeopathy usually recover after taking homeopathy medicine. It’s supporters often claim this is proof for the efficacy of the medicine, and ignore possible placebo effects.


Case Study Two

Some studies that allegedly show that theists are happier than atheists are extended as evidence for the power of god, rather than for the power of belief in god.


Keep in mind that a fallacious argument does not entail an erroneous position.


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