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Habituation and sensitization of protective reflexes: dissociation between cardiac defense and eye-blink startle

Mata, J.L, Rodriguez-Ruiz, S., Ruiz-Padial, E., Turpin, G. and Vila, J. (2009) Habituation and sensitization of protective reflexes: dissociation between cardiac defense and eye-blink startle. Biological Psychology, 81 (3). pp. 192-199. ISSN 0301-0511

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We examined the habituation and recovery of two protective reflexes, cardiac defense and eye-blink startle, simultaneously elicited by a white noise of 500 ms as a function of the time interval between stimulus presentations. Participants were 90 volunteers (54 women) randomly distributed into 6 inter-trial interval (ITI) conditions. They all received three presentations of the stimulus with a time interval of 30 min between the first and third noise. The timing of the second noise was manipulated in six steps, using a between-group design, in order to increase the ITI between Trials I and 2 and symmetrically decrease the ITI between Trials 2 and 3. Cardiac defense showed fast habituation at the shortest ITI (2.5 min), but reduced habituation and increased recovery at the longest ITI (27.5 min). In contrast, eye-blink startle showed sensitization irrespective of the ITI. This pattern of findings highlights dissociations between protective reflexes when simultaneously examined. The results are discussed in the context of the cascade model of defense reactions. (C) 2009 Elsevier B.V. All rights reserved.

Item Type: Article
Copyright, Publisher and Additional Information: © 2009 Elsevier. This is an author produced version of a paper subsequently published in Biological Psychology. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: Cardiac defense; Eye-blink startle; Habituation; Sensitization; Defense cascade
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Science (Sheffield) > Department of Psychology (Sheffield)
Depositing User: Miss Anthea Tucker
Date Deposited: 03 Aug 2009 14:16
Last Modified: 08 Feb 2013 16:58
Published Version: http://dx.doi.org/10.1016/j.biopsycho.2009.04.006
Status: Published
Publisher: Elsevier
Refereed: Yes
Identification Number: 10.1016/j.biopsycho.2009.04.006
URI: http://eprints.whiterose.ac.uk/id/eprint/9037

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