The role of input and output modality pairings in dual-task performance: evidence for content-dependent central interference

Recent debate regarding dual-task performance has focused on whether costs result from limitations in central capacity, and whether central operations can be performed in parallel. While these questions are controversial, the dominant models of dual-task performance share the assumption that central operations are generic--that is, their interactions are independent of stimulus and response modalities. To examine these issues, we conducted a series of dual-task experiments with different input and output modality pairings. One condition combined a visual-manual task with an auditory-vocal task, and the other condition reversed the input-output pairings, combining a visual-vocal task with an auditory-manual task. Input/output modality pairings proved to be a key factor; throughout practice, dual-task costs were generally more than twice as large with visual-vocal/auditory-manual tasks than with the opposite arrangement of modalities (Experiments 1 and 2). These differences could be explained neither by competition for peripheral resources nor by differences in single-task response times (Experiment 3). Moreover, the persistent dual-task costs did not appear to stem from a central bottleneck. Contrary to the dominant models of dual-task performance, we propose that central interference between tasks depends not just on the duration of central operations, nor just strategic adaptation, but also on the content of those operations. Implications for structural and strategic accounts of dual-task interference are discussed.     

Musculoskeletal pain complaints and performance on cognitive tasks over the adult life span

The present study aimed at comparing participants with and without self reported musculoskeletal pain in a normal population with regard to performance on a range of tests for episodic memory, semantic memory, and other cognitive functions and to see if expected differences interacted with age. The results showed that participants with pain performed worse on a range of tasks as compared to participants without pain, and that these differences occurred regardless of age. The most robust effects of pain were displayed on tests for vocabulary and construction ability as these were the only effects that remained significant after controlling for years of education and reported depression in separate analyses. When depression and education were controlled for in the same analysis, even these effects were eliminated, suggesting interplay between pain, depressive status, and educational level in the negative effects on cognitive functioning.     

The perception of tempo in music

Tempo is one factor that is frequently associated with the expressive nature of a piece of music. Composers often indicate the tempo of a piece of music through the use of numerical markings (beats min(-1)) and subjective terms (adagio, allegro). Three studies were conducted to assess whether listeners were able to make consistent judgments about tempo that varied from piece to piece. Listeners heard short extracts of Scottish music played at a range of tempi and were asked to make a two-alternative forced choice of "too fast" or "too slow" for each extract. The responses for each study were plotted as proportion of too fast responses as a function of tempo for each piece, and cumulative normal curves were fitted to each data set. The point where these curves cross 0.5 is the tempo at which the music sounds right to the listeners, referred to as the optimal tempo. The results from each study show that listeners are capable of making consistent tempo judgments and that the optimal tempo varies across extracts. The results also revealed that rhythm plays a role, but not the only role in making temporal judgments.     

Cognitive bias via the Internet: a comparison of Web-based and standard emotional Stroop tasks in social phobia

There is accumulating evidence to suggest that social phobia is associated with attentional bias for words related to social threat. Information processing in individuals with social phobia (n = 87) was investigated in the present study using 2 versions of the emotional Stroop task. Results from a standard emotional Stroop task indicated delayed colour naming of socially threatening words relative to neutral words, in line with previous research, whereas results from a Web-based emotional Stroop task indicated a facilitation effect, with faster manual indication of colour choice for socially threatening words than for neutral words. Possible explanations for these contrasting findings and issues for further research are discussed.     

An index of specific behaviors in the moral domain

Studies on attribution in the moral domain often involve the use of specific behavior examples. To make valid comparisons across trait dimensions (such as honesty and friendliness), it is important to equate the intensities of the specific behaviors used. Pretesting specific behaviors can be a costly effort, but it is often necessary for research in social psychology. Our study provides a rich source of such pretested behaviors. Positive and negative examples of behaviors in the categories of honesty, loyalty, friendliness, charitableness, and cooperativeness were solicited from participants and then rated on the relevant trait dimension by an independent group. The result is data representing rankings, raw scores, andz-scores in an index of 500 behaviors across 10 trait categories that can be used by researchers to study moral and immoral behaviors. The full index of behaviors is available at www .psychonomic.org/archive/.     

Comparisons between exemplar similarity and mixed prototype models using a linearly separable category structure

Nosofsky and Zaki (2002) found that an exemplar similarity model provided better accounts of individual subject classification and generalization performance than did a mixed prototype model proposed by Smith and Minda (1998; Minda & Smith, 2001). However, these previous tests used a nonlinearly separable category structure. In the present work, the authors extend the previous findings by demonstrating a superiority for the exemplar generalization model over the mixed prototype model in a case involving a linearly separable structure. Because this structure has numerous features that Minda and Smith argued should be conducive to prototype-based processing, the results pose a significant challenge to the mixed prototype view.     

Resilience to loss and chronic grief: a prospective study from preloss to 18-months postloss

The vast majority of bereavement research is conducted after a loss has occurred. Thus, knowledge of the divergent trajectories of grieving or their antecedent predictors is lacking. This study gathered prospective data on 205 individuals several years prior to the death of their spouse and at 6- and 18-months postloss. Five core bereavement patterns were identified: common grief, chronic grief, chronic depression, improvement during bereavement, and resilience. Common grief was relatively infrequent, and the resilient pattern most frequent. The authors tested key hypotheses in the literature pertaining to chronic grief and resilience by identifying the preloss predictors of each pattern. Chronic grief was associated with preloss dependency and resilience with preloss acceptance of death and belief in a just world.     

A teen court evaluation with a therapeutic jurisprudence perspective

Teen court defendants were assessed on several attitudinal measures when they entered and when they completed their teen court program. Teen court volunteers and high school civics students in a control group were assessed on the same measures at two points in time that approximated the length of teen court involvement for defendants. Re-offense rates for defendants were assessed. In addition, defendants and their parents completed satisfaction surveys. The teen court experience did not significantly impact the attitudes and beliefs of either the defendants or the volunteers. The re-offense rate for defendants was 13%, which is similar to other teen court programs and less than the re-offense rate for the general diversion program in the county that was the target of the study. Since this teen court selected youth with the least serious delinquency activity (primarily shoplifting), conclusions about the program's effectiveness in reducing further offending cannot be made. Defendants and their parents reported high levels of satisfaction with their teen court experience but defendants became more alienated from institutional authority. This study did not support the teen court experience as having a generally beneficial impact on defendants or volunteers that would be expected from a therapeutic jurisprudence perspective.