However, we are emotional creatures subject to wants and desires, lusts, greed, happiness and sadness, as well as the psychoactive effects of chemical stimulants that might make access to particular resources in some contexts inappropriate or hazardous. 'Our ability to react to dangerous situations is directly related to our capacity to relate to our environment, and our sense of self-preservation.' As such, if one is in a well-balanced emotional state one will react to external factors according to context, group expectations, education, cultural background, social norms and personal inclinations, these are what game theory refers to as rational players. 'The true engine of motivation is our capacity to perceive pleasure and fear pain, and thus, reward and punishment,' explains Tulceanu. Now, Violeta Tulceanu of the University of Iasi is adding an emotion detector to biometric security. Most security systems simply expect a PIN or password while biometric systems look for a fingerprint, a view of the user's iris or retina or some other mundane but unique characteristic. It could also have applications in the military, electronic learning, and healthcare, according to research published in the International Journal of Advanced Intelligence Paradigms.

Such a system might be used to control entry to a building, access to computer resources or even the withdrawal of money from an automated teller machine. The system then determines whether the user is in a fit mental state and grants them access to resources only if appropriate. A security system is being developed that analyses the user's brainwaves.

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