Abstract
Though studies of the relation between reaction time (RT) and the
number of stimuli or responses from which to choose dates back to
at least 1885, Hick (Quarterly J. Exp. Psych., 1952, 4, 11-26) and,
separately, Hyman (J. Exp. Psych., 1953, 45, 188-196) argued that
RT increases linearly with the amount of information conveyed by
the number of choices. Thus, a binary (two-valued, yes/no) response
has one bit of information, while a four-choice response has two
bits, etc.). In this experiment, subjects must choose between two,
three, or four responses, in separate blocks of the experiment.
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