This chapter is concerned with evidence produced by paradigms with latency or response time as the dependent variable. In these paradigms, the subjects are instructed to report as fast as possible one or another attribute of one or more selected items. The research question of interest is what determines the speed of initiating the expression of a proposition – for instance, the speed of initiating ‘red’ of ‘this square is red’ or the speed of initiating ‘horse’ of ‘that word is HORSE’. Response time is determined by and dependent on several perceptual and post-perceptual factors. Therefore, response time can reflect and reveal a range of properties and strategies of the information processing system that accuracy cannot.