The elapsed time between a specified event and a response. The event, response criterion and time units must be defined; trial exclusion and aggregation affect its analysis. Repeated trials from one participant are not independent participant-level observations.
A relationship in which changes in response caution or time allocation affect both speed and error rate. A faster mean response is not automatically better performance if accuracy also falls; both measures and their uncertainty should be examined.
A model in which separate sensory channels can each trigger a response, and the first completed channel determines response time. Context invariance means that a channel's marginal completion distribution is unchanged between its single-signal and redundant-signal conditions. Independence is a separate, stronger assumption.
Under context-invariant channel distributions, by the union bound; probability is also at most one. No independence assumption is needed. A reliable violation rejects this model with those marginals, not every possible separate-channel or decision account.
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