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Zbornik radova

Autori: Reić, Ina; Manenica, Ilija
Naslov: Effects of stimulus expectancy on heart rate and movement execution
Izvornik: 6th Alps-Adria Conference of Psychology Abstracts / Remo job, Daniela Selvatico (ur.). - Rovereto, Italy : Naklada Slap , 2002. 28-29.
Skup: 6th Alps-Adria Conference of Psychology
Mjesto i datum: Rovereto, Italija, 03-05.10.2002.
Ključne riječi: stimulus expectancy; heart rate; movement execution
Earlier investigations of effects of stimulus expectancy situations on heart rate have mainly supported the hypothesis of cardiac deceleration, where the deceleration facilitated the reaction to environmental stimuli (Lacey, 1972). Some models, such as Jennings’ s (1992), tried to link the cardiac deceleration with readiness of the information processing system to act. These models are based on reaction time data, where cardiac deceleration in stimulus expectancy situation facilitated reactions. The aim of this study was to find out whether the stimulus expectancy situation followed by lower arm movements, would facilitate the execution of movements. Ten subjects were trained to do lower arm movements of four different amplitudes (20, 40, 60 and 80 degrees), without visual control, on a kinaesthesiometer, after a sound stimulus. The sound stimulus appeared at the end of expectancy intervals of various durations, when the subject had started to execute the given movement. The movement time, error magnitude (the difference between the given and executed amplitude) was registered together with the subject’ s R-R intervals. R-R intervals were continuously recorded during the stimulus expectancy intervals, the movement execution and resting period. The analysis of results showed a significant cardiac deceleration (an increase in mean R-R intervals) for all magnitudes of the expectancy intervals. This was more prominent with longer expectancy intervals. Contrary to the results of studies on reaction time, no effects of the length of expectancy intervals on the movement time and/or precision were found. In comparison with reaction time studies, the difference could be explained on the basis of differences in the tasks used, where the reaction time tasks required reaction only, while the movement tasks required speed and precision, i. e. they were more complex, with a comparatively more prominent mental component due to the kinaesthetic information processing. This claim was also supported by a greater R-R interval va riability suppression as the movement amplitude increased.
Vrsta sudjelovanja: Predavanje
Vrsta prezentacije u zborniku: Sažetak
Vrsta recenzije: Međunarodna recenzija
Projekt / tema: 0070022
Izvorni jezik: ENG
Kategorija: Znanstveni
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