For more bending your brain research, in this case on choices and rationalizations. It isn't directly relevant to fingerprint examination, except in showing how our brain can construct a rationale for any decision, even one opposite from an initial choice.http://sites.google.com/site/lucswiki/p ... -blindness
The basic idea underlying choice blindness research is to use false feedback as an instrument to study intentions, self-knowledge and preference formation in decision making. For example, in Johansson et al. (2005), the participants were shown pairs of pictures of female faces, and were given the task of choosing which face in each pair they found most attractive. In addition, on some trials, immediately after their choice, they were asked to verbally describe the reasons for choosing the way they did. Unknown to the participants, on certain trials, a double-card ploy was used to covertly exchange one face for the other. Thus, on these trials, the outcome of the choice became the opposite of what they intended (see video link below). From a common sense perspective it would seem that everyone immediately would notice such a radical change in the outcome of a choice. But that was not the case. The result showed that in the great majority of trials our participants were blind to the mismatch between choice and outcome, while nevertheless being prepared to offer introspectively derived reasons for why they chose the way they did.
Here's a video clip demonstrating the experiment:http://www.youtube.com/watch?v=wRqyw-Ew ... re=related
Choice blindness is a robust, replicable, and often dramatic effect (not only baffling to many participants, but to the researchers themselves). As described above, we have established it for male and female faces as well as abstract patterns, both when the alternatives are presented on a computer screen and when presented ‘by hand’. We have also demonstrated choice blindness for the taste of jam and the smell of tea in an ecologically valid supermarket setting. In this experiment, we set up a sample stand at a local supermarket, where we invited customers to participate in a blind test of two paired varieties of jam and tea. The results were similar to our experiments with faces, as very few participants detected the changes we made (even for such remarkably different tastes as spicy Cinnamon-Apple and bitter Grapefruit, or for the sweet taste of Mango and pungent Pernod less than half of all manipulation trials were detected)
Here's two video clips demonstrating the experiment: http://www.youtube.com/watch?v=_VPcl04Adh8 http://www.youtube.com/watch?v=58Lrzn7P0h8