Abstract/Details

The physiological response to implicit and explicit fear faces in alexithymia


2008 2008

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Abstract (summary)

Alexithymia is a form of disordered emotional processing associated with psychiatric illness and poor treatment outcomes. Its hallmarks are difficulty identifying, representing and evaluating emotional material. Research on alexithymia includes investigations of behavioral, physiological and neural responsivity. Findings within and between these different methodologies are inconsistent and often not well motivated. We use the neuroimaging literature to motivate a design that links behavior and physiology in alexithymia. The aims of this study are to determine: (1) whether individuals with alexithymia exhibit behavioral responses to emotional faces that differ from controls and whether there are corresponding changes in physiology, (2) whether behavioral and physiological responses in alexithymia are differentially influenced by an implicit versus explicit manipulation of emotional task context, compared to controls.

For Aim 1, we measure behavioral and physiological responses during two explicit facial categorization tasks: an emotion task requiring categorization of morphed emotional facial expressions, and an identity task requiring categorization of morphed facial identities. For Aim 2, we evaluate responses to emotional and neutral facial expressions in two task contexts: in an explicit task participants label the emotion of the face, while in an implicit task participants label the gender of the face. Using these experiments we determined whether undergraduates scoring high (TAS ≥ 61) or low (TAS ≤ 51) on alexithymia (TAS-20) differ on accuracy, reaction time, heart rate and skin conductance.

Counter to prevailing theories of alexithymia as an appraisal problem, we found that alexithymia participants’ task accuracy on emotional and non-emotional tasks is intact. We found less sensitivity to fearful faces during an emotion categorization task, but not a non-emotional identity categorization task, as we expected. In alexithymia, we found less sensitivity to emotion and altered heart rate reactivity during implicit and explicit tasks, compared to healthy controls. Counter to current conceptualizations of alexithymia as a difficulty engaging in top-down appraisal of emotional information, our findings suggest that alexithymia may be a problem generating physiological responses to emotional information. Based on our view of alexithymia, we revisit the current state of the alexithymia literature, provide suggestions for future research and propose potential therapeutic interventions.

Indexing (details)


Subject
Clinical psychology;
Personality psychology;
Cognitive psychology;
Physiological psychology
Classification
0622: Clinical psychology
0625: Personality psychology
0633: Cognitive psychology
0989: Physiological psychology
Identifier / keyword
Psychology; Alexithymia; Emotion; Fear faces; Heart rate; Physiology; Skin conductance
Title
The physiological response to implicit and explicit fear faces in alexithymia
Author
Gilbert, Alison M.
Number of pages
159
Publication year
2008
Degree date
2008
School code
0178
Source
DAI-B 69/11, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780549895480
University/institution
University of Pittsburgh
University location
United States -- Pennsylvania
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3335756
ProQuest document ID
304498412
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304498412
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