Mathura
210 Eric 498 517
Laboratory 8 - Perception: The Effect of Stimulus Discriminability on
Reaction Time - Crossman's Confusion Function
Difference
Line Length
Index of diffficulty
SEM
1
92
64.12
33.13
2
91
31.88
30.66
4
89
15.77
31.4
6
87
10.39
28.11
2) y = 4.6794(12) + 395.24451.3 y = 1.66(12) + 510.53530.45
So for confusion function value of 12 bits; the DRT for my own data is 451.3ms, while for the
group data its 530.45ms.
3) From the results of the figure we can conclude that as the coefficient of difficulty increases,
the DRT increase. Therefore as the line got smaller, the task more become difficult, resulting in
DRT time increasing since the line were harder to differentiate since they looked similar.
4) The slope of the Confusion Function represents the discriminability between 2 stimuli.
Therefore the steeper/higher the slope, the higher the DRT, therefore more time to process
information, resulting in that person being less efficient than a person with a lesser slope. So as
you can see in my graph, my data had the higher slope compared to the group data, therefore I
was less efficient in processing the data resulting in my DRT being higher than the group data.