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On the translation of some stimulus features to response force

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Jaskowski P., Werner I., Verleger R.
Acta Neurobiologiae Experimentalis
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2003
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vol. 63
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issue 4
327-335
EN
Romaigucre et al. (1993) reported an stimulus-response (S-R) experiment in which the participants had to respond to bright or dim stimuli by pressing a key strongly or weakly. Reaction time (RT) for a compatible S-R assignment (bright-strong; dim-weak) was substantially shorter than for an incompatible S-R assignment (dim-strong; bright-weak). This effect was explained as a direct translation of stimulus intensity to response force (RF). In the present study, we looked for other stimulus features that could be directly transferred to RF. We investigated stimulus size (large/small), vertical location (above/below), and brightness (bright/dim). Delays of RT for incompatible trials were found in case of brightness and size, but not location. In a second experiment, we tested whether such a direct translation might even cause changes of spontaneous RF. Without being instructed about RF, participants made simple reactions to stimuli which differed either in location, size or brightness. Indeed, stimulus size affected RF: larger stimuli were associated with stronger responses. In contrast, brightness had no effect. Thus, we replicated and extended Romaigucre et al.?s (1993) finding. However, the direct-translation account for RF variations received only partial support from our data.
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The effect of stimulus intensity on force output in simple reaction time task in humans

88%
Jaskowski P., Rybarczyk K., Jaroszyk F., Lemanski D.
Acta Neurobiologiae Experimentalis
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1995
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vol. 55
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issue 1
57-64
EN
The force needed to press the key in a simple reaction time task was measured as a function of stimulus intensity for visual and auditory stimuli in the three experiments using a total 45 male and female human objects.Intensity ranged from 0.316 to 1995 cd/sq.m for visual stimuli and from ranged from 47 to 102 dB for auditory stimuli.We found, an in agreement with Angel's original study, that for auditory stimuli higher intensity is accompanied by a larger force.Suprisingly, in the case of visual stimuli the intensity does not influence the force.These findings are explained by the assumption that the changes of force reflect the changes of unspecific activation level evoked by immediate arousal.Thus, the different behaviour of force for these two modalities is in agreement with the common view that loud auditory stimuli are arousing while intense visual ones are not.
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