Spatial inattention abolishes voice adaptation

Adaptation to male voices causes a subsequent voice to be perceived as more female, and vice versa. Similar contrastive aftereffects have been reported for phonetic perception, and in vision for face perception. However, while aftereffects in the perception of phonetic features of speech have been reported to persist even when adaptors were processed inattentively, face aftereffects were previously reported to be abolished by inattention to adaptors. Here we demonstrate that auditory aftereffects of adaptation to voice gender are eliminated when the male and female adaptor voices are spatially unattended. Participants simultaneously heard gender-specific male or female adaptor voices in one ear and gender-neutral (androgynous) adaptor voices in the contralateral ear. They selectively attended to the adaptor voices in a designated ear, by either classifying voice gender (Exp. 1) or spoken syllable (Exp. 2). Voice aftereffects were found only if the gender-specific voices were spatially attended, suggesting capacity limits in the processing of voice gender for the unattended ear. Remarkably, gender-specific adaptors in the attended ear elicited comparable aftereffects in test voices, regardless of prior attention to voice gender or phonetic content. Thus, within the attended ear, voice gender was processed even when it was irrelevant for the task at hand, suggesting automatic processing of gender along with linguistic information. Overall, voice gender adaptation requires spatial, but not dimensional, selective attention.     

Happy with a difference, unhappy with an identity: Observers’ mood determines processing depth in visual search

Visual search for feature targets was employed to investigate whether the mechanisms underlying visual selective attention are modulated by observers’ mood. The effects of induced mood on overall mean reaction times and on changes and repetitions of target-defining features and dimensions across consecutive trials were measured. The results showed that reaction times were significantly slower in the negative than in the positive and neutral mood groups. Furthermore, the results demonstrated that the processing stage that is activated to select visual information in a feature search task is modulated by the observer’s mood. In participants with positive or neutral moods, dimension-specific, but no feature-specific, intertrial transition effects were found, suggesting that these observers based their responses on a salience signal coding the most conspicuous display location. Conversely, intertrial effects in observers in a negative mood were feature-specific in nature, suggesting that these participants accessed the feature identity level before responding.     

Weighing the past and the future in decision making

Prior irreversible investments of money, time, or effort referred to as sunk costs frequently lead to decisions to continue a chosen course of action despite that this is irrational. With the aim of demonstrating that such escalation of commitment is a special case of a more general phenomenon, two experiments were carried out employing undergraduates as participants. Experiment 1 showed for fictitious personal and business investment scenarios that both prior losses and gains (sunk outcomes) affected choices to continue or discontinue the investment. In Experiment 2 the effect of sunk outcomes was reduced although not eliminated by a monetary bonus that in one condition depended on the future outcomes of the second gamble in two-stage gambles, in another condition on the future returns in personal investment scenarios. In support of a more inclusive theory subsuming escalation of commitment, the decisions were affected by both past and future outcomes and both gains and losses.     

The Political Reputation of Students in Upper Secondary School: Consequences for Their Collective Political Activities Four Years Later

This longitudinal study examines the role that students' political reputation in class plays in their future political activities offline together with other people. When aged 16, students were asked to nominate the classmates they considered politically knowledgeable and verbal in class, that is, as having a political reputation. This measure of political reputation was used to predict the participants' political activities offline four years later at age 20 and their attempts to take a stand in public in the national election the same year. The study controlled for individual differences in political interest, self-perceived political impact in class, the students' political activities at age 16, and also gender and immigrant status. About 300 Swedish students were followed up four years later. Political reputation in class positively predicted future political activities offline, membership of political organizations, and attempts to take a stand in public for a party in the forthcoming national election. At the same time, the role played by political reputation depended upon students' other characteristics, especially their levels of anger and popularity, as observed by classmates. Evidently, the group dynamics in class that give some students a political reputation have long-term consequences for their future political activities.     

Adolescents' family obligation and activities in rural and urban Vietnam: Implications for social change

This study examined how urbanisation may modify adolescents' values and activities concerning family obligation by surveying 572 adolescents (M_age = 15.75, SD = .73) in rural and urban Vietnam. Compared with their rural peers, urban adolescents reported a stronger sense of family obligation but spent less time actually engaging in family assistance, findings that were partly explained by urban households' less financial hardship and higher parental education levels. As expected, stronger family obligation values were associated with greater family assistance activities across rural and urban Vietnam. However, stronger family obligation values were associated with more study hours only in urban Vietnam, indicating that urbanisation may broaden the meaning of family obligation to encompass the academic domain. Additionally, weaker family obligation values were associated with more employment hours only in rural Vietnam, suggesting that rural adolescents with little attachment to the traditional value of family obligation may pursue autonomy through employment outside the home. In traditionally familistic societies undergoing urbanisation, family obligation may take on different meaning depending on adolescents' ecological settings that construct cultural values and behavioural norms.     

Cooperative Division of Cognitive Labour: The Social Epistemology of Photosynthesis Research

Journal for General Philosophy of Science - How do scientists generate knowledge in groups, and how have they done so in the past? How do epistemically motivated social interactions influence or...