The equation of the skill acquisition curve of the type shown in Figure 8.2 is:
RTkPa=+ log(),
(8.1)
where k and a are constants, and P = number of trials or units of practice. It
can also be characterized as a power law relationship:
RTaP
b
=
−
,
(8.2)
where b is the shape parameter for the power law function and signifies the
rate by which training speeds up response time; a is a constant once again.
In the earlier times of human– computer interaction, control functions were
commands that were typed into the system with a keyboard. Commands
were kept brief under the thinking that shorter was better. McKendree ...
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