The fMRI task.

<p>(A) The task was conducted in an event-related design. Six trials from either the liked or the uninteresting male acquaintance were combined in a set. Each set contained pseudo-randomized four target trials (shown in red) with two control trials (shown in blue). (B) Each trial was created by a 2 × 3 factorial design. In a target trial, female participants judged the gift attractiveness (1: the least attractive, 9: the most attractive). In a control trial, the participants simply pressed the button when a white dot appeared by the side of the portrait. For details, see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0136168#sec002" target="_blank">Materials and Methods</a>.