Reflective Consensus Building on Wicked Problems with the Reflect! Platform

Science and Engineering Ethics - Wicked problems—that is, problems that can be framed in a number of different ways, depending on who is looking at them—pose ethical challenges for...     

The role of stimulus-based and response-based spatial information in sequence learning

In 4 experiments, relational structures were independently varied in stimulus and response sequences in a serial reaction time task. Moreover, the use of spatial and symbolic stimuli and responses was varied between experiments. In Experiment 1, spatial stimuli (asterisk locations) triggered spatial responses (keystrokes); in Experiment 2, spatial stimuli triggered symbolic responses (verbal digit naming); in Experiment 3, symbolic stimuli (digits) triggered keystrokes; and in Experiment 4, digits triggered verbal responses. The results showed that there is a remarkably stronger effect of relational structures in spatial sequences than in symbolic sequences, irrespective of whether stimulus or response sequences are concerned. This suggests that learning is particularly effective for sequences of spatial locations. It is argued that spatial learning is a critical determinant for the debate on perceptual and motor learning.     

The role of warning behaviors in threat assessment: an exploration and suggested typology

The concept of warning behaviors offers an additional perspective in threat assessment. Warning behaviors are acts which constitute evidence of increasing or accelerating risk. They are acute, dynamic, and particularly toxic changes in patterns of behavior which may aid in structuring a professional's judgment that an individual of concern now poses a threat - whether the actual target has been identified or not. They require an operational response. A typology of eight warning behaviors for assessing the threat of intended violence is proposed: pathway, fixation, identification, novel aggression, energy burst, leakage, directly communicated threat, and last resort warning behaviors. Previous research on risk factors associated with such warning behaviors is reviewed, and examples of each warning behavior from various intended violence cases are presented, including public figure assassination, adolescent and adult mass murder, corporate celebrity stalking, and both domestic and foreign acts of terrorism. Practical applications and future research into warning behaviors are suggested.     

Comment on “Visual layout modulates Fitts’s law: The importance of first and last positions”

Pratt, Adam, and Fischer (2007) investigated the effect of surrounding targets on the time it took to move to an individual target and found that the movement time to a central target was above the Fitts’s law line related to the first and last targets. They explained their results in terms of a “visuomotor hypothesis.” Here, an alternative explanation is given in terms of a previously validated model of the “available target width” that is determined by the size of the target and the width of the finger pad that is being used to hit the target.     

Correction to: A psychophysiological investigation of mourning: There are two sides to the story

Motivation and Emotion - Mourning constitutes an important human emotion, which might cause—among other things—major depressive symptoms when lasting for too long. To date, no study...     

Single Parenthood and Adolescent Sexual Outcomes

Research suggests that children of single parents are at heightened risk of precocious sexual behavior, STDs, and other risky sexual outcomes. However, few such studies have addressed the type of single-parent family (single mother or single father), or differences across other-sex parent–child dyads. While gender essentialist models assume differences among youth living only with mothers or with fathers, constructivist models propose more flexible modes of parenting that lead to more similar outcomes. Using data from the National Longitudinal Study of Adolescent to Adult Health (n?=?2570) on youth between the ages of 15 and 19, we compared sexually-related outcomes among adolescents, both boys and girls, who lived with a single mother or a single father. These outcomes include sexual intercourse and knowledge, use of contraception, attitudes toward intimacy and pregnancy, and diagnosis of sexually-transmitted diseases. The results from linear and logistic regression models indicated few differences between single-mother and single-father families, or between same-sex and opposite-sex parent–child matches, using p values of .05 or smaller. Our results called into question essentialist models that posit higher risks for adolescents living with a particular parent or with an opposite-sex parent.     

Shifts of spatial attention cued by irrelevant numbers: Electrophysiological evidence from a target discrimination task

Fischer et al. demonstrated that a centrally presented number can shift attention to the left/right when its magnitude is small/large. Two electrophysiological studies described these attentional effects as event-related potentials (ERPs) at centro-parietal sites. Since both studies used target detection tasks, it remains currently unknown whether similar results would be obtained with a discrimination task. We used ERPs to test whether digit cues also induce attention shifts when participants perform a feature-discrimination task on targets. ERPs were recorded whereas subjects discriminated the colour of lateral targets that were preceded by a central non-predictive digit. Analysis of cue-locked controlateral vs. ipsilateral ERP activity showed the emergence of early preparatory attention-directing components in parietal and frontal regions. Moreover, target-locked P1 components at occipito-parietal sites were significantly modulated by digit magnitude-target side congruency. These results demonstrate that irrelevant digit cues also bias sensory processing when embedded in a feature-discrimination task.