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The impact of prior risk experiences on subsequent risky decision-making: the role of the insula.

Abstract：

:Risky decision-making is significantly affected by homeostatic states associated with different prior risk experiences, yet the neural mechanisms have not been well understood. Using functional MRI, we examined how gambling decisions and their underlying neural responses were modulated by prior risk experiences, with a focus on the insular cortex since it has been implicated in interoception, emotion and risky decision-making. Fourteen healthy young participants were scanned while performing a gambling task that was designed to simulate daily-life risk taking. Prior risk experience was manipulated by presenting participants with gambles that they were very likely to accept or gambles that they were unlikely to accept. A probe gamble, which was sensitive to individual's risk preference, was presented to examine the effect of prior risk experiences (Risk vs. Norisk) on subsequent risky decisions. Compared to passing on a gamble (Norisk), taking a gamble, especially winning a gamble (Riskwin), was associated with significantly stronger activation in the insular and dorsal medial prefrontal cortices. Decision making after Norisk was more risky and more likely to recruit activation of the insular and anterior cingulate cortices. This insular activity during decision making predicted the extent of risky decisions both within- and across-subjects, and was also correlated with an individual's personality trait of urgency. These findings suggest that the insula plays an important role in activating representations of homeostatic states associated with the experience of risk, which in turn exerts an influence on subsequent decisions.

journal_name

Neuroimage

journal_title

NeuroImage

authors

Xue G,Lu Z,Levin IP,Bechara A

doi

10.1016/j.neuroimage.2009.12.097

subject

Has Abstract

pub_date

2010-04-01 00:00:00

pages

709-16

issue

2

eissn

1053-8119

issn

1095-9572

pii

S1053-8119(09)01386-X

journal_volume

50

pub_type

杂志文章

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