Studies of adult attachment indicate that intimacy avoidance is associated with general negative emotionality and withdrawal from potentially positive aspects of social relations. Such emotional negativity and withdrawal motivation have been connected in psychophysiological studies with the right frontal lobe of the brain, whereas the left frontal lobe specialises in emotional positivity and approach behaviour. In the present study we used a divided visual field task to investigate hemispheric asymmetries in making decisions about the positivity or negativity of attachment- and emotion-related words, as well as various kinds of control words. We found that more avoidant individuals made more errors when judging positive attachment-related words presented to the right hemisphere. The findings are discussed in terms of possible effects of attachment history on the way attachment-related information is processed in the brain.

Recent neuroscience research is beginning to discover the brain regions involved in decision-making under uncertainty, but little is known about whether or how these regions functionally interact with each other. Here, we used event-related functional magnetic resonance imaging to examine both changes in overall activity and changes in functional connectivity during risk-taking. Results showed that choosing high-risk over low-risk decisions was associated with increased activity in both anterior cingulate and orbitofrontal cortices. Connectivity analyses revealed that largely distinct, but somewhat overlapping, cortical and subcortical regions exhibited significant functional connectivity with anterior cingulate and orbitofrontal cortices. Additionally, connectivity with the anterior cingulate in some regions, including the orbitofrontal cortex and nucleus accumbens, was modulated by the decision participants chose. These findings (1) elucidate large networks of brain regions that are functionally connected with both anterior cingulate and orbitofrontal cortices during decision-making and (2) demonstrate that the roles of orbitofrontal and anterior cingulate cortices can be functionally differentiated by examining patterns of connectivity. (c) 2005 Elsevier B.V. All rights reserved.