The beat goes on: rhythmic modulation of cortical potentials by imagined tapping

A frequency analysis was used to tag cortical activity from imagined rhythmic movements. Participants synchronized overt and imagined taps with brief visual stimuli presented at a constant rate, alternating between left and right index fingers. Brain potentials were recorded from across the scalp and topographic maps made of their power at the alternation frequency between left and right taps. Two prominent power foci occurred in each hemisphere for both overt and imagined taps, one over sensorimotor cortex and the other over posterior parietal cortex, with homologous foci in opposite hemispheres arising from oscillations 180 degrees out of phase. These findings demonstrate temporal isomorphism at a neural level between overt and imagined movements and illustrate a new approach to studying covert actions.     

Duplicate publication and ‘paper inflation’ in the fractals literature

The similarity of documents in a large database of published Fractals articles was examined for redundancy. Three different text matching techniques were used on published Abstracts to identify redundancy candidates, and predictions were verified by reading full text versions of the redundancy candidate articles. A small fraction of the total articles in the database was judged to be redundant. This was viewed as a lower limit, because it excluded cases where the concepts remained the same, but the text was altered substantially. Far more pervasive than redundant publications were publications that did not violate the letter of redundancy but rather violated the spirit of redundancy. There appeared to be widespread publication maximization strategies. Studies that resulted in one comprehensive paper decades ago now result in multiple papers that focus on one major problem, but are differentiated by parameter ranges, or other stratifying variables. This ‘paper inflation’ is due in large part to the increasing use of metrics (publications, patents, citations, etc) to evaluate research performance, and the researchers’ motivation to maximize the metrics. The views in this paper are solely those of the authors, and do not necessarily represent the views of the Department of the Navy or any of its components, UNAM, University of Virginia or University of Karlsruhe.     

Detecting emotional faces and features in a visual search paradigm: are faces special?

In 2 experiments, participants were presented schematic faces with emotional expressions (threatening, friendly) in a neutral-faces context or neutral expressions in an emotional-faces context. These conditions were compared with detection performance in displays containing key features of emotional faces not forming the perceptual gestalt of a face. Supporting the notion of a threat detection advantage, Experiment 1 found that threatening faces were faster detected than friendly faces, whereas no difference emerged between the corresponding feature conditions. Experiment 2 increased task difficulty with a backward masking procedure and found corresponding results. In neither of the studies was the threat detection advantage associated with reduced accuracy. However, features were, in general, detected faster than faces when task difficulty was high.     

The joint effect of informational mood impact and performance-contingent consequences on effort-related cardiovascular response

Drawing on the mood-behavior model (G. H. E. Gendolla, 2000) and J. W. Brehm and E. A. Self's (1989) theory of effort mobilization, 2 experiments investigated the joint effect of mood, task difficulty, and performance-contingent consequences on effort-related cardiovascular response. Informational mood impact on demand appraisals and performance-contingent consequences had a joint effect on effort mobilization. When consequences were noncontingent on performance, mood interacted with task difficulty to determine cardiovascular reactivity in the shape of a cross-over interaction pattern. Yet when positive consequences were performance contingent, cardiovascular reactivity strongly increased only in the negative-mood/difficult-task condition--the subjectively appraised high necessary effort was now justified. Implications for the role of mood in motivation are discussed.     

Knowledge of partner's ability as a moderator of group motivation gains: an exploration of the Köhler discrepancy effect

O. K?hler (1926, 1927) found that less able performers tried harder as team members under conjunctive task demands (Kohler motivation gain effect) and that the greatest gain occurred with moderately discrepant coworker abilities (K?hler discrepancy effect). Recent investigations have reproduced K?hler's overall motivation gain but not the discrepancy effect. The present research examined whether workers' foreknowledge of task abilities--present in Kohler's research, absent in contemporary studies--moderates the discrepancy effect. Participants worked alone or in 2-person teams under conjunctive task demands. Experiment 1 manipulated foreknowledge of ability. Experiment 2 manipulated discrepancy: a (confederate) teammate performed slightly, moderately, or substantially better. Both experiments found (a) overall motivation gains and (b) discrepancy moderation under foreknowledge conditions. Implications for understanding group motivation gains are discussed.     

Informational mood impact on effort-related cardiovascular response: the diagnostic value of mood counts

Drawing on the mood-behavior model (G. H. E. Gendolla, 2000), 2 experiments examined moods' informational impact on effort-related cardiovascular response. After being induced into positive versus negative moods, participants performed a memory task (Experiment 1) or a letter-cancellation task (Experiment 2). Half the participants received a cue that their mood could have been manipulated. As expected, both studies found stronger reactivity of systolic blood pressure in a negative mood than in a positive mood when no cue was provided. This effect diminished in the cue conditions. Additionally, achievement corresponded to systolic blood pressure reactivity (Experiment 1), the cue manipulation had no effect on mood, and mood had a congruency effect on subjective task difficulty in the no-cue conditions (Experiment 2).     

Speed-accuracy modulation in case of conflict: the roles of activation and inhibition

This study investigated how the speed-accuracy balance is modulated by changes in the time course of motor activation and inhibition of a primed response. Responses and event-related brain potentials were recorded in a paradigm in which the first stimulus indicated the correct response with 80% validity. The remaining 20% of the trials required no response (no-go) or a response opposite to the cued hand (change trials). Subjects were instructed either to balance speed and accuracy or to emphasize speed at the cost of accuracy. Analyses of error patterns, reaction time distributions and brain potentials show that subjects can modulate the amount of activation of the primed response. More surprisingly, the engagement of inhibition of the response also varied with the speed-accuracy instruction. The results are consistent with a model where the frontothalamic loop actively controls both the activation and the inhibition of responses, depending on the current task requirements. This study was supported by the Netherlands Organization of Scientific Research (NWO) grant numbers 575-63-082 and 575-25-004. The work of Dr. Band and Dr. Ridderinkhof was supported by grants from the Royal Netherlands Academy of Arts and Sciences     

Family Communication about Donor Conception: A Qualitative Study with Lesbian Parents

In this qualitative study of 10 lesbian couples who built their families through anonymous donor conception, we explore how lesbian parents experience communication about the donor conception within the family. While for these families “disclosure” of donor conception is often seen as evident, the way parents and children discuss this subject and how this is experienced by the parents themselves has not received much research attention. To meet this gap in the literature, in‐depth interviews with lesbian couples were conducted. An Interpretative Phenomenological Analysis showed that this family communication process can be understood within the broader relational context of parent–child relationships. Even though parents handled this family communication in many different ways, these were all inspired by the same motives: acting in the child's best interest and—on a more implicit level—maintaining good relations within the family. Furthermore, parents left the initiative for talking about the DC mostly to the child. Overall, parents aimed at constructing a donor conception narrative that they considered acceptable for both the children and themselves. They used different strategies, such as gradual disclosure, limiting the meaning of the donor, and justifying the donor conception. Building an acceptable donor conception narrative was sometimes challenged by influences from the social environment. In the discussion, we relate this qualitative systemic study to the broader issues of selective disclosure and bidirectionality within families.     

Measuring parental and family efficacy beliefs of adolescents' parents: Cross‐cultural comparisons in Italy and Portugal

The goal of this study was to examine the psychometric properties of the Perceived Parental Self‐Efficacy (PPSE) and Perceived Family Collective Efficacy (PFCE) revised scales in the Portuguese and Italian contexts. To this aim two studies were conducted: the first reported the exploratory and confirmatory factor analyses with Portuguese samples, whereas the second addressed the cross‐cultural invariance of PPSE and PFCE (Portugal and Italy). Results of the first study showed the appropriate fit of the unifactorial model of both scales to Portuguese data. The invariance analyses performed in the second study attested to the PPSE and PFCE's configural, metric and scalar invariance in both countries. The correlations of PPSE and PFCE with communication, management of conflict and children's school achievement further attested to their construct and practical validity. Thus, PPSE and PFCE proved to be suitable to further use in research and psychological assessment fields.     

Harbour seals (<Emphasis Type="Italic">Phoca vitulina</Emphasis>) are able to time precisely

Time along with space is one of the two fundamental dimensions of life. Whereas spatial aspects have been considered in experiments with marine mammals, research has so far not focused on timing per se although it is most likely involved in many behaviours such as foraging or navigation. This study investigated whether harbour seals possess a sense of time and how precisely they are able to discriminate time intervals. Experiments took place in a chamber that allowed keeping ambient illumination constant at 40 lx. The animal was presented with a white circle on a black background on a monitor displayed for a preset time interval. In a two-alternative forced-choice experiment, the animal had to indicate the presence of the standard or a longer comparison time interval by moving its head to one out of two response targets. Time difference thresholds were assessed for various standard intervals between 3 to 30 s adopting a staircase procedure. The experimental animal found access to the task easily and discriminated time intervals with difference thresholds partly in the millisecond range. Thus our study revealed a well-developed sense of time in a pinniped species. Time, besides information provided by the classical senses, is thus most likely an important parameter seals can rely on for various tasks including navigation and foraging.