Effect of probe stimulus intensity on the dissociation between autonomic orienting and secondary probe reaction time

Neumann, DL, Lipp, OV and Siddle, DAT (2001) Effect of probe stimulus intensity on the dissociation between autonomic orienting and secondary probe reaction time. Australian Journal of Psychology, 53 2: 72-76. doi:10.1080/00049530108255126


Author Neumann, DL
Lipp, OV
Siddle, DAT
Title Effect of probe stimulus intensity on the dissociation between autonomic orienting and secondary probe reaction time
Journal name Australian Journal of Psychology   Check publisher's open access policy
ISSN 0004-9530
Publication date 2001-01-01
Sub-type Article (original research)
DOI 10.1080/00049530108255126
Volume 53
Issue 2
Start page 72
End page 76
Total pages 5
Editor C. Lee
Place of publication Australia
Publisher Australian Psychological Society
Collection year 2001
Language eng
Subject C1
380101 Sensory Processes, Perception and Performance
780108 Behavioural and cognitive sciences
Abstract Information processing accounts propose that autonomic orienting reflects the amount of resources allocated to process a stimulus. However, secondary task reaction time (RT), a supposed measure of processing resources, has shown a dissociation from autonomic orienting. The present study tested the hypothesis that secondary task RT reflects a serial processing mechanism. Participants (N = 24) were presented with circle and ellipse shapes and asked to count the number of longer-than-usual presentations of one shape (task-relevant) and to ignore presentations of a second shape (task-irrelevant). Concurrent with the counting task, participants performed a secondary RT task to an auditory probe presented at either a high or low intensity and at two different probe positions following shape onset (50 and 300 ms). Electrodermal orienting was larger during task-relevant shapes than during task-irrelevant shapes, but secondary task RT to the high-intensity probe was slower during the latter. In addition, an underadditive interaction between probe stimulus intensity and probe position was found in secondary RT. The findings are consistent with a serial processing model of secondary RT and suggest that the notion of processing stages should be incorporated into current information-processing models of autonomic orienting.
Keyword Psychology, Multidisciplinary
Processing Resources
Task
Allocation
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Psychology Publications
 
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Created: Wed, 15 Aug 2007, 01:28:21 EST