time and choice reaction time, finding that simple reaction was faster. This concept is now one of the central tenets of cognitive psychology while mental chronometry is not a topic in itself, it is one of the most common tools used for making inferences about processes such as learning, memory, and attention. Using reaction time, Donders constructed what is known as reaction time, and three distinct ways to analyze it. The common version was task A (simple). When Donders’s conducted task A, he stimulated the participant’s foot in order to measure the fastest hand reaction. Participants were made known ahead of time that they would be measuring how fast the response of their hand was (which enabled them to better sense the stimulation). Donder’s task B (choice) consisted of stimulation in the right hand and measuring the response of the right foot. This task had the same goals as task A; On top of that the subject’s ability to discriminate the stimulus and point out the stimulus was also measured and requires the intervention of a response decision. The third distinct task was known as the C task (Go/No-go task) To analyze this task Donder stimulated the both feet of participants. Participants were asked to respond with their right hand when they felt stimulation in the right foot, but not to do the same with the left side. This task was also designed to measure the participants ability to detect stimuli and offer the requested response. Donders’s task C cannot be performed without intervention of stimulus discrimination occurring within the sensory and motor process. He represents the durations of these processes labeling them as a-, b- and c- methods (example a/-a = eat/don’t eat) In order to utilize these methods Donders used the speech repetition task Different patterns were used for different methods. The pattern of reaction time is a<c<b. Donders taught that c-a can find the discrimination duration, and that b-c can find the choice duration. When learning to measure the speed of thought, Franciscus Donders was not keen of using electromagnetism to measure. He claimed that as the intensity changed, so would the results. Instead he looked at devices such as the phonautograph to graph out the speed of human speech. Donders founded the Nederlands Gasthuis voor Behoeftige en Minvermogende Ooglijders (in short: Ooglijdersgasthuis) the Netherlands Hospital for Necessitous Eye-Patients in 1858. His first associate was Herman Snellen.