Stimulus significance effects in habituation of the phasic and tonic orienting reflex |
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Authors: | Email author" target="_blank">Robert?J?BarryEmail author |
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Institution: | (1) Brain & Behaviour Research Institute, University of Wollongong, Wollongong, Australia;(2) Department of Psychology, University of Wollongong, 2522 Wollongong, Australia |
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Abstract: | Phasic and tonic measures of electrodermal activity were examined in a simple habituation paradigm, using innocuous visual
stimuli. Separate groups were used to investigate the effects of stimulus significance, as manipulated by instructions. One
group had no stimulus-related task (indifferent group), while the other was asked to silently count the stimuli to report
to the experimenter later (significant group). Prestimulus skin conductance levels were considered as measures of the arousal
level at each stimulus presentation, and the subsequent electrodermal responses were taken as the phasic orienting reflex
(OR) elicited by each stimulus. Changes in prestimulus arousal were taken as measures of the tonic OR to the experimental
series. Marked group differences were found in both phasic and tonic components of the OR. Some, but not all, of the significance
effects in the phasic OR were attributable to differences in arousal. The results are discussed in the context of theoretical
accounts of the OR. |
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Keywords: | electrodermal activity skin conductance level skin conductance response Orienting Reflex OR theory significance |
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