by Acikgoz » Tue Jan 19, 2010 8:31 am
Still a man hears what he wants to hear
And disregards the rest
– The Boxer, by Paul Simon
For instance, a group of people were asked to read randomly selected studies on the deterrent efficacy of the death sentence (and criticisms of those studies). Subjects were also asked to rate the studies in terms of the impact they had had on their views on capital punishment and deterrence. Half of the people were pro-death penalty and half were anti-death penalty.
"Those who started with a pro-death sentence stance thought the studies that supported capital punishment were well argued, sound and important. They also thought that the studies that argued against the death penalty were all deeply flawed. Those who held the opposite point of view at the outset reached exactly the opposite conclusion.
"As the psychologists concluded: asked for their final attitudes relative to the experiment’s start, proponents reported they were more in favor of capital punishment, whereas opponents reported that they were less in favor of capital punishment.’ In effect each participant’s views polarized, becoming much more extreme than before the experiment.
"In another study of biased assimilation (accepting all evidence as supporting your case) participants were told a soldier at Abu Ghraib prison was charged with torturing prisoners. He wanted the right to subpoena senior administration officials. He claimed he’d been informed that the administration had suspended the Geneva Convention.
"The psychologists gave different people different amounts of evidence supporting the soldier’s claims. For some, the evidence was minimal; for others, it was overwhelming. Unfortunately the amount of evidence was essentially irrelevant in assessing people’s behavior. For 84% of the time, it was possible to predict whether people believed the evidence was sufficient to subpoena Donald Rumsfeld based on just three things:
1. The extent to which they liked Republicans
2. The extent to which they liked the US military
3. The extent to which they liked human rights groups like Amnesty International.
"Adding the evidence into the equation allowed the researchers to increase the prediction accuracy from 84% to 85%. Time and time again, psychologists have found that confidence and biased assimilation perform a strange tango. It appears the more sure people were that they have the correct view, the more they distorted new evidence to suit their existing preference, which in turns made them even more confident!"