No abstract

No abstract

Previous studies have shown that the amygdala is important in processing not only animate entities but also social information. It remains to be determined to what extent the factors of category and social context interact to modulate the activities of the amygdala and cortical regions. In this study, pictures depicting animals and inanimate objects in negative and neutral levels were presented. The contexts of the pictures differed in whether they included human/human parts. The factors of valence, arousal, familiarity and complexity of pictures were controlled across categories. The results showed that the amygdala activity was modulated by category and contextual information. Under the nonhuman context condition, the amygdala responded more to animals than objects for both negative and neutral pictures. In contrast, under the human context condition, the amygdala showed stronger activity for negative objects than animals. In addition to cortical regions related to object action, functional and effective connectivity analyses showed that the anterior prefrontal cortex interacted with the amygdala more for negative objects (vs. animals) in the human context condition, by a top-down modulation of the anterior prefrontal cortex to the amygdala. These results highlighted the effects of category and human contexts on modulating brain activity in emotional processing.

Following an earlier study of 806 sex workers in Singapore in which they were found to succeed only half the time in getting clients to use condoms, a qualitative investigation was conducted on 40 sex workers to explore their perceived barriers and approaches in negotiating condom use with clients. Five different patterns of condom use were identified: successful, unsuccessful, misinformed, passive and uninterested. The successful negotiators used several practical approaches to secure clients' compliance. Unsuccessful negotiators experienced problems such as inability to resist clients' pressure or respond to their queries. The misinformed group believed that regular clients were safe. The passive group did not negotiate condom use due to their perceptions of lack of support from peers and brothel keepers, and the uninterested group was apathetic with fatalistic perceptions of AIDS. The in-depth interviews with successful negotiators provided relevant, specific and practical information which could be disseminated to their peers to develop their negotiation skills. This qualitative study also provided useful insights on condom use negotiation and highlighted the need for comprehensive interventions which should not only aim at developing sex workers' negotiation skills but also at gathering support from brothel keepers to facilitate behaviour change, and public education directed at clients to increase condom use.