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Regarding the Software Failure: The operators were warned that, although the Therac-25 had many safety precautions, it might be possible to accidentally overdose a patient.
Weber Fraction
A principle that quantifies the perception of change in a given stimulus, stating that the just noticeable difference is a constant proportion of the original stimulus’s intensity.
Difference Threshold
The smallest amount that a given stimulus must be increased or decreased so that an individual can detect the difference.
Standard Stimulus
A specific stimulus used as a reference point in psychological experiments to measure reactions or perceptions.
Weber's Law
A principle describing the smallest difference in stimulus intensity that is detectable, typically proportional to the intensity of the original stimulus.
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