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Nevertheless, the study of conscious accompaniments in the context of reaction time was an important historical development in the late 1800s and early 1900s. For example, Wundt and his associate Oswald Külpe often studied reaction time by asking participants to describe the conscious process that occurred during performance on such tasks. [8]
Stimulus–response (S–R) compatibility is the degree to which a person's perception of the world is compatible with the required action. S–R compatibility has been described as the "naturalness" of the association between a stimulus and its response, such as a left-oriented stimulus requiring a response from the left side of the body.
If the stimulus fits the trigger conditions, the action triggers automatically execute the response. As an example, the participant's task might be to indicate whether a visually presented number is smaller or larger than five, [33] such that the left-hand key is pressed for numbers "1" to "4" and the right-hand key is pressed for numbers "6 ...
'A' indicates a left-handed response and 'B' a right-handed response). The stimuli also vary on another dimension that indicates whether a response is necessary (e.g. small letter requires a response, large letter means do not respond). For example, a small 'A' would indicate a left-handed go, and a large 'B' would be a right-handed no-go.
Inspection time refers to the exposure duration required for a human subject to reliably identify a simple stimulus. Typically a stimulus made up of two parallel lines differing in length and joined at the tops by a cross bar is presented (similar to the Greek letter Pi ).
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Since saccadic latencies to a lateralized stimulus can be as fast as 150ms following stimulus onset, the lateralized stimulus should only be presented for a duration of 180ms at most. [ 2 ] A free software tool called the "Lateralizer" has been developed for piloting and conducting customizable experiments using the divided visual field paradigm.
The reaction time increased by as much as 30%. [4] However, what is usually seen as the first genuine demonstration of the effect that became known as the Simon effect is by Simon & Rudell (1967). [5] Here, they had participants respond to the words "left" and "right" that were randomly presented to the left or right ear.