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Autori: Nikolić, Matilda; Šuto, Ana
Naslov: Working Stress and Strain in Fitts Tapping Task
Izvornik: 7th Alps-Adria Conference in Psychology Abstracts / Manenica, Ilija (ur.). - Zadar : Odjel za psihologiju Sveučilište u Zadru , 2005. 46-46.
Skup: 7th Alps-Adria Conference in Psychology
Mjesto i datum: Zadar, Hrvatska, 02-04. 06.2005.
Ključne riječi: task difficulty ; effort ; HRV ; spectral analysis
Various studies have shown that efficiency in Fitts Tapping Tasks changes almost proportionally to the changes in the task complexity. The estimates of the task difficulty also follow the same pattern. Some studies, however, which included heart rate variability (HRV), have not yielded the same results. In some of them it is very difficult to relate changes in HRV to changes in the task difficulty. Since HRV parameters have been shown to be good indicators of the subject's involved effort in the task (strain), it seems plausible to assume that the fall in efficiency in Fitts Tapping Task, as its difficulty increases, may be due to lack of subject's effort to meet the increasing task demands. This means that the subject keeps his effort the same level regardless of the task difficulty. The aim of the study, which included 12 subjects who performed the series of Fitts Tapping Tasks for five minutes each, was to test this hypothesis. Apart from the efficiency, i.e. the number of target hit in five minutes, subject's cardiac R-R intervals were continuously recorded before, during and after the task. After the completion of every task the subjects were asked to estimate separately, the task difficulty and their effort exerted in the task, on Borg's scale (Borg, 1973). The results showed that efficiency and the task difficulty assessment were highly correlated with the task complexity, expressed in bits. Contrary to this, subject's self reported effort stayed the same for all the tasks regardless of the difficulty. HRV parameters, such as means and standard deviations did not show an interpretable pattern of changes, while spectral analysis of R-R intervals showed a decrease in power spectrum for low (0.04 – 0.15 Hz) and high (0.15 – 0.4 Hz) frequency bands, as the task difficulty increased. The results suggest that the deterioration in performance in relation to the task difficulty takes place mainly due to lack of subject's additional effort, which may be the reason for lacking systematic changes in parameters. The changes in the R-R power spectrum, however, seem to reflect changes in the ratio of mental and motor involvement of the subject in the task, although the subject's effort seems to remain the same. A further analysis of results should show which of the two components (mental or motor) is prevalent the spectral changes.
Vrsta sudjelovanja: Predavanje
Vrsta prezentacije u zborniku: Sažetak
Vrsta recenzije: Međunarodna recenzija
Projekt / tema: 0070022
Izvorni jezik: ENG
Kategorija: Znanstveni
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