That is, it indicates how fast the individual can execute the mental operations needed by the task at hand.
In turn, speed of processing is considered an index of processing efficiency.
This supported the idea that a subject did a serial exhaustive search through memory rather than a serial self-terminating search.
Shepard and Metzler (1971) presented a pair of three-dimensional shapes that were identical or mirror-image versions of one another.
Uncertainty is measured in "bits", which are defined as the quantity of information that reduces uncertainty by half in information theory.
In Hick's experiment, the reaction time is found to be a function of the binary logarithm of the number of available choices (n).
His insertion method, often referred to as "pure insertion", was based on the assumption that inserting a particular complicating requirement into an RT paradigm would not affect the other components of the test.
To control for this, researchers typically require a subject to perform multiple trials, from which a measure of the 'typical' or baseline response time can be calculated.
Taking the mean of the raw response time is rarely an effective method of characterizing the typical response time, and alternative approaches (such as modeling the entire response time distribution) are often more appropriate.