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Unformatted text preview: on time task- there is increased RT
with the increase number of choices. Number of S-R alternatives
In choice RT, increased time with increased
number of choices represents increased processing
of information at the response-selection stage.
is curvilinear, and
is explained by
work of Hick
Hick s Law you can pick reaction time based on this formula. Hick s Law
Choice RT is linearly related to the log of the
number of stimulus options:
Choice RT = k log2 (N+1) (Y)
16 log2 (Y)
4 (2 x 2)
(2 x 2 x 2)
(2 x 2 x 2 x 2) ﬁtts laww only works with the case of reaching. this is a littl emore general than
that bu it still is a law because it just describes--know this shit for the test and yo
should be able to calculatet his on the tets bring your claculators. N = number of S-R alternatives
k is a constant (usually simple RT) who invented information theory---shannon!!!!!! Hick s Law******
In information theory, log2 represents a binary
unit, or bit of information. A bit is a yes/no (1/0)
1 bit decision = 2 alternatives (yes/no)
2 bit decision = 4 alternatives
3 bit decision = 8 alternatives
• Increases in RT are a curvilinear function of the # of
• Increases in RT are a linear function of the # of bits
• Increases in RT are a linear function of the log of the
# of alternatives 16 Hick s Law
Consider a pitcher s options..
Action Decision Pitch? Curve Loc? or inside outside Height? L H L # bits H Fast 1 bit
2 bit inside outside
L H L 3 bit H Hick s Law
Hick s law correctly predicts RT increases with
increasing choice alternatives, and predicts
size of increase.
Two caveats to Hick s law:
1. Excess familiarit...
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This document was uploaded on 03/28/2014 for the course KNES 385 at Maryland.
- Fall '08