ABSTRACT
The use of reaction time (RT) measurement in the study of cognitive processes is one of the oldest ideas in experimental psychology, but still one of the most active ones in the field of human information processing of today. It is essentially due to the Dutch physiologist F. C. Donders [1969]. He advanced the assumption that cognitive processes proceed in stages or serially, and proposed to measure the duration of a cognitive process by comparing the average RT’s from a task which does and another one which does not require the execution of that process for the solution of the task.
