Response time is used here to interpret choice in decision problems. I first establish that there is a close connection between short response time and choices that are clearly a mistake. I then investigate whether a correlation also exists between response time and behavior that is inconsistent with some standard theories of decision making. The lack of such a correlation could be interpreted to imply that such behavior does not reflect a mistake. It is also shown that a typology of slow and fast responders may, in some cases, be more useful than the standard typologies.

In economics, three nested organizational levels, namely behavioural, mental and neural, can be distinguished. They introduce specific theoretical or observable concepts and suggest their own models for choice making. If psycho-economics relates implemented actions to declared mental states, neuro-economics relates mental states to brain areas. Bridge principles can be defined which link concepts with similar interpretations at two successive levels. Thanks to these principles, relations or even models independently suggested at two successive levels may well be associated. Some prescriptive applications of these principles were more recently proposed, but they remain grounded on a too fragile basis.