Meet the Rationalizer, an emotion-sensing system targeted at stress-prone home investors who trade heavily online. Developed as a concept by Philips Electronics, It acts as an 'emotion mirror' in which the intensity of the user’s feelings is reflected.

Research shows that home investors do not act purely rationally: their behavior is influenced by emotions, most notably fear and greed, which can compromise their ability to take an objective, factual stance. This insight led to the Rationalizer concept in which online traders are alerted when it may be wise to take a time-out, wind down and re-consider their actions.

It's generating a lot of commentary (some which pokes fun!) at places like Engadget and while its market seems almost impossibly narrow, I have no doubt the Rationalizer might be a good idea for helping people keep their cool under stress while they worry though the consequences of each fast-moving trade. The real-time skin-sweat measurement the Rationalizer takes is one of the measurement inputs used by Somatic Vision in its products, and this particular measurement reflects the stimulation vs. relaxation biological range. You can watch some videos of the Rationalizer at Engadget.