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Psychology of Lying - Why People Lie - Mind - I’m Not Lying, I’m Telling a Future Truth. Really. - New York Times

A series of recent studies, focusing on students who inflate their grade-point average, suggests that such exaggeration is very different psychologically from other forms of truth twisting. Touching up scenes or past performances induces none of the anxiety that lying or keeping secrets does, these studies find; and embroiderers often work to live up to the enhanced self-images they project. The findings imply that some kinds of deception are aimed more at the deceiver than at the audience, and they may help in distinguishing braggarts and posers from those who are expressing personal aspirations, however clumsily.

But a study published in February in the journal Emotion found that exactly the opposite was true for students who exaggerated their grades. The researchers had 62 Northeastern University students fill out a computerized form asking, among other things, for cumulative grade point average. The students were then interviewed while hooked up to an array of sensitive electrodes measuring nervous system activation. The scripted interview covered academic history, goals and grades.

The researchers then pulled the students’ records, with permission, and found that almost half had exaggerated their average by as much as six-tenths of a point. Yet the electrode readings showed that oddly enough, the exaggerators became significantly more relaxed while discussing their grades.