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    The effect of startle reflex habituation on cardiac defense: Interference between two protective reflexes

    Access Status
    Fulltext not available
    Authors
    Fernández, M.
    Vila, J.
    Lipp, Ottmar
    Purkis, H.
    Date
    2008
    Type
    Journal Article
    
    Metadata
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    Citation
    Fernández, M. and Vila, J. and Lipp, O. and Purkis, H. 2008. The effect of startle reflex habituation on cardiac defense: Interference between two protective reflexes. International Journal of Psychophysiology. 69 (1): pp. 27-32.
    Source Title
    International Journal of Psychophysiology
    DOI
    10.1016/j.ijpsycho.2008.02.007
    ISSN
    0167-8760
    School
    School of Psychology and Speech Pathology
    URI
    http://hdl.handle.net/20.500.11937/5791
    Collection
    • Curtin Research Publications
    Abstract

    The present study investigated the relationship between blink startle and cardiac defense, two protective reflexes that are said to be elicited by the transient and the sustained components, respectively, of high intensity stimuli. Three groups of participants were presented with three intense long lasting noise stimuli (500ms) after habituation training with 12 brief (50ms) high intensity noise bursts (High group), low intensity noise bursts (Low group) or high intensity visual stimuli (Light group). The transition from habituation to defense stimuli resulted in increased blink startles in groups Low and Light, but not in group High. A cardiac defense reflex, characterised by a short and long delayed increase in heart rate, was observed in group Light, but not in groups Low and High. This pattern of results indicates that habituation to startle eliciting stimuli will impair defense reflexes elicited on subsequent test trials and suggests some interrelation between the two reflex systems. © 2008 Elsevier B.V. All rights reserved.

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