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particular regions gave different results. However, they do not
allow to differ models in terms of predictability of human behavior.
It was impossible to compare the models by using the proposed
methods as well. Therefore, this variable should be further ex
-
amined and its, effectiveness should be estimated. However
for Zhai & Shah, method 2 and method 4, SUN DOG method
3, there was a visible and signiicant difference in reaction time
in term of saliency. This shows that it is really worth to repeat
the experiment and the proposed schema can be valuable and
useful for testing the eficiency and reinement of attention models.
Conclusion
In this study an alternative to the eye-tracking method of evalu-
ating models of attention was presented. The obtained results
indicate a potential usefulness of the modiied cueing task for
this type of research. This technique allowed to notice that there
is a connection between SOA and reaction time. The results,
especially for model Zhah & Shai, indicate that it is worth to
repeat and continue the research. There is a noticeable cor
-
relation between saliency and reaction time. In the future the
experiments should be continued on more subjects and a lager
image database to reduce the inluence of noise on the reaction
times. Furthermore, other methods of calculating the saliency
value in image regions could be examined. Finally, in subsequent
studies the spatial resolution of the proposed method could be
increased by multiplying the division of the analyzed images into
rectangles. The division on 9 ields was a major simpliication,
which also could affect obtained results.
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because they needed more time to program the motion. Koch, Itti and Niebur [1] assume 30-70ms time as suficient to make any
further saccades. The average time of ixation, however, is given as approximately 200 ms. Perhaps the respondents needed time
to move gaze ixated on the point of concentration. It is also worth to remember that the technique based on the Posner task was
originally applied with a very simple stimuli. In this paper the cue (image) was extremely complex and full of information. Perhaps
such a complex stimuli requires more complex analysis and the analogy to the Posner’s experiment is not straightforward.
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tics
BIO-ALGORITHMS AND MED-SYSTEMS
JOURNAL EDITED BY JAGIELLONIAN UNIVERSITY – MEDICAL COLLEGE
Vol. 7, No. 13, 2011, pp. 57-62
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