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Functional imaging of sympathetic activation during mental stress.

Abstract：

:Activation of the sympathetic nervous system (SNS) is essential in adapting to environmental stressors and in maintaining homeostasis. This reaction can also turn into maladaptation, associated with a wide spectrum of stress-related diseases. Up to now, the cortical mechanisms of sympathetic activation in acute mental stress have not been sufficiently characterized. We therefore investigated cerebral activation applying functional magnetic resonance imaging (fMRI) during performance of a mental stress task with graded levels of difficulty, i.e. four versions of a Stroop task (Colour Word Interference Test, CWT) in healthy subjects. To analyze stress-associated sympathetic activation, skin conductance and heart rate were continuously recorded. The results show that sympathetic activation through mental stress is associated with distinct cerebral regions being immediately involved in task performance (visual, motor, and premotor areas). Other activated regions (right insula, dorsolateral superior frontal gyrus, cerebellar regions) are unrelated to task performance. These latter regions have previously been considered to be involved in mediating different stress responses. The results might furthermore serve as a basis for future investigations of the connection between these cortical regions in the generation of stress-related diseases.

journal_name

Neuroimage

journal_title

NeuroImage

authors

Fechir M,Gamer M,Blasius I,Bauermann T,Breimhorst M,Schlindwein P,Schlereth T,Birklein F

doi

10.1016/j.neuroimage.2009.12.004

subject

Has Abstract

pub_date

2010-04-01 00:00:00

pages

847-54

issue

2

eissn

1053-8119

issn

1095-9572

pii

S1053-8119(09)01291-9

journal_volume

50

pub_type

杂志文章

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