Neural correlates of intrusion of emotion words in a modified Stroop task

Van Hooff, Johanna C. and Dietz, Kristina Charlotte and Sharma, Dinkar and Bowman, Howard (2008) Neural correlates of intrusion of emotion words in a modified Stroop task. International Journal of Psychophysiology, 67 (1). pp. 23-34. ISSN 0167-8760 . (Full text available)

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http://dx.doi.org/10.1016/j.ijpsycho.2007.09.002

Abstract

Behavioural studies have demonstrated that the emotional Stroop task is a valuable tool for investigating emotion-attention interactions in a variety of healthy and clinical populations, showing that participants are typically more distracted by negative stimuli as compared to neutral or positive stimuli. The main aim of this study was to find and examine the neural correlates of this greater intrusion from negative emotional stimuli. Reliable reaction time (RT) and event-related potential (ER-P) data were collected from 23 participants who performed a manual emotional Stroop, task with short (40 ins) and long (500 ms) inter-trial intervals. In the short interval condition, participants were found to produce longer RTs for negative than neutral words, suggesting that these stimuli were more difficult to ignore. This RT effect disappeared in the long interval condition, although larger PI amplitudes were found for the negative words. This suggests that differences in early attention allocation may be unrelated to the degree of intrusion at the behavioural level. In addition, a larger negative slow wave around 300-700 ms post-stimulus was observed in the long interval condition, but only for those negative words that produced prolonged RTs as compared to their matched controls. This late and broadly distributed effect is believed to reflect suppression of meaning representations.

Item Type: Article
Uncontrolled keywords: emotional Stroop; attentional bias; emotion intrusion; event-related potentials
Subjects: R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
B Philosophy. Psychology. Religion > BF Psychology
Divisions: Faculties > Science Technology and Medical Studies > School of Computing > Computational Intelligence Group
Faculties > Social Sciences > School of Psychology > Cognitive Psychology
Depositing User: C.A. Simms
Date Deposited: 07 Mar 2009 11:26
Last Modified: 12 May 2014 13:39
Resource URI: http://kar.kent.ac.uk/id/eprint/4511 (The current URI for this page, for reference purposes)
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