A two-state model of simple reaction time

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for judgment of total magnitude of simultaneously presented
temporal intervals,
and
(3-17)
for judgments of average duration of successively presented
stimuli.
With the assumption that subjective duration is related to
measured duration by a linear function, both equations can be
rewritten as follows,
For eq. (3-17),
For eq. (3-16),
(3-18)
(3-19)
That is, they concluded that (1) when the information to be
integrated was presented sequentially, the judgment was made in
the way which was consistant with a linear composition rule,
eq.(3-18),and (2) when the information was presented simultaneously,
judgments were based on the vector summation rule, eq.(3-19).