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Kokis -- Obsidian hydration dating / Irving Friedman, Fred W.
Sternberg -- Surface dating using rock varnish / Joan S.
Subjects were then given a probe stimulus in the form of a digit from 0-9.
The subject then answered as quickly as possible whether the probe was in the previous set of digits or not.
This assumption—that the incremental effect on RT was strictly additive—was not able to hold up to later experimental tests, which showed that the insertions were able to interact with other portions of the RT paradigm. Hick (1952) devised a CRT experiment which presented a series of nine tests in which there are n equally possible choices.
Despite this, Donders' theories are still of interest and his ideas are still used in certain areas of psychology, which now have the statistical tools to use them more accurately. The experiment measured the subject's reaction time based on number of possible choices during any given trial.
The size of the initial set of digits determined the reaction time of the subject.
Taylor -- Potassium-argon/argon-argon dating methods / Robert C.
RT is constrained not only by the speed of signal transmission in white matter, but also by the properties of synaptic and neural processing in cortical gray matters.
Due to momentary attentional lapses, there is a considerable amount of variability in an individual's response time, which does not tend to follow a normal (Gaussian) distribution.
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.