The Cognitive Demands of Gait Retraining in Runners: An EEG Study

Abstract

High impact forces during running have been associated with tibial stress injuries. Previous research has demonstrated increasing step rate will decrease impact forces during running. However, no research has determined the cognitive demand of gait retraining. The primary purpose was to determine the cognitive demand and effectiveness of field-based gait retraining. We hypothesized that in-field gait retraining would alter running mechanics without increasing cognitive workload as measured by EEG following learning. Runners with a history of tibial injury completed a gait retraining protocol which included a baseline run, retraining phase, practice phase, and re-assessment following retraining protocol. Results demonstrated an increase in the theta, beta, and gamma power within prefrontal cortex during new learning and corresponding return to baseline following skill acquisition and changes across alpha, beta, gamma, mu, and theta in the motor cortex (p < .05). In the midline superior parietal cortex, spectral power was greater for theta activity during new learning with a corresponding alpha suppression. Overall, the results demonstrated the use of EEG as an effective tool to measure cognitive demand for implicit motor learning and the effectiveness of in-field gait retraining.     

Barriers to Computerized Career Interventions in Community Outreach Centers

This study used a survey design to investigate if computer experience and computer attitudes influence whether economically marginalized individuals desire access to computerized career services in community outreach centers. The majority (84%) of the sample reported a desire for access to computerized career services at community outreach centers. A multiple regression analysis indicated computer attitudes as most predictive of intention to use computerized career services (β = .29, p < .01). Results support extending access to computerized career services in community outreach centers to meet the needs of economically marginalized individuals.     

In support of selective rehearsal: Double-item presentation in item-method directed forgetting

Psychonomic Bulletin & Review - Despite the substantial evidence highlighting the role of selective rehearsal in item-method directed forgetting, recent work has suggested that forgetting may...     

A Long Time Coming: Delays in Collective Apologies and Their Effects on Sincerity and Forgiveness

Political apologies by one group to another often occur a significant period of time after the original transgression. What effect does such a delay have on perceptions of sincerity and forgiveness? A delayed apology could reflect the offender group's reluctance to apologize, or, alternatively, it could represent time and consideration spent on developing an appropriate response. In the latter case, the delayed apology would represent a sincere acknowledgment of the harm done, whereas in the former case it would not. In two studies, we found that a verbal collective apology, when delayed, was perceived to be less sincere than when offered more immediately following a transgression, and this translated to less forgiveness. However, in Study 2, the negative effects of time delay on sincerity and forgiveness were mitigated or reversed when the apology was in the form of commemoration. The commemorative apology, in particular when delayed, gave rise to favorable attributions (including representativeness of apologizing group, commitment to remember, and giving voice to victims), which mediated the effects on sincerity. The results suggest that collective apologies that are offered with considerable delay appear less meaningful and less deserving of a forgiving response, unless the apologizing group is able to express consideration and thoughtfulness through the apology process.     

Approaching Success or Avoiding Failure? Approach and Avoidance Motives in the Work Domain

In our set of studies, we extended research on approach and avoidance motivations by investigating (i) motives in a work setting, (ii) interactions among approach and avoidance motives, and (iii) motives at implicit levels. Results of Studies 1 through 3 provided support for the construct validity of our work motives measure by demonstrating that approach and avoidance work motives are markers of more general approach and avoidance temperaments, they are distinct from other individual difference variables commonly studied by organisational psychologists (e.g. conscientiousness, regulatory focus and cognitive ability) and they are stable over time. In Studies 4 through 7, we confirmed our predictions that approach and avoidance motives predict employees' goal orientations, job appraisals and attitudes (e.g. job satisfaction and perceived support) and supervisor‐rated job behaviours (e.g. task performance and citizenship behaviour). Importantly, we provide the first empirical evidence that approach and avoidance motives interact to predict task performance and that the motives operate at implicit levels. Copyright © 2012 European Association of Personality Psychology     

The bizarreness effect: evidence for the critical influence of retrieval processes

People show better memory for bizarre sentences relative to common sentences, a finding referred to as the bizarrness effect. Interestingly, this effect is typically only obtained using a mixed-list design, in which participants study common and bizarre sentences in the same list. This bizarreness effect in mixed-list designs has been explained as the result of both enhanced encoding processes and efficient retrieval processes. The present experiment was designed to isolate the unique contributions of the retrieval context to the bizarreness effect. Participants studied common sentences in one room under one set of instructions, and bizarre sentences in another room under another set of instructions. At test, participants recalled the common and bizarre sentences either together or separately. The results showed that the bizarreness effect was only obtained when participants recalled the common and bizarre items together; no bizarreness advantage emerged when participants were required to recall the common and bizarre items separately. These results suggest that differential encoding processes are not necessary for explaining the bizarreness effect in memory. Rather, retrieval of the mixed-list context appears to be critical for obtaining the effect.     

An Exploratory Study of Discrimination of Composer Style

With an alternate study-test procedure, 254 college students attempted either to free-recall or rearrange in order items of an 11-CVC serial list to a criterion of two consecutive perfect trials. Ss learned the list with or without an isolate which was placed on each of the 11 serial positions. The main findings were as follows: (a) While the reconstruction condition required fewer study trials to criterion than the free-recall condition, the isolation effect occurred equally in both conditions. (b) The isolation effect was a function of the serial position; the effect was greater at the central positions than at the peripherals in free-recall and this trend was essentially reversed in the reconstruction condition. (c) In free-recall, no reliable and systematic spreading effect was obtained for the items immediately preceding and following the isolate; however, a positive spreading effect occurred concurrently with the isolation effect in the reconstruction condition. The isolation effect has been accounted for by a selective rehearsal assumption. Implications regarding the functional cues in serial order learning and the isolation effect in serial learning are suggested.     

Measuring Clarity of and Attention to Emotions

To clarify what is actually measured by the trait version of the State-Trait Anxiety Inventory (STAI; Spielberger, Gorsuch, &; Lushene, 1970), we conducted a confirmatory factor analysis of various models and evaluated convergent and discriminant validity. The best fit was obtained with both a bifactor model, comprising 2 specific factors plus a general factor, and a 1-construct, 2-method model. The total score and the 2 method subscales of the STAI trait version were more strongly correlated with depression than with anxiety. In the bifactor model with 2 specific factors, the depression subscale showed stronger correlations with measures of depression than with measures of anxiety. The correlation of the hypothetical anxiety subscale with measures of depression was equivalent to or higher than its correlation with measures of anxiety. These results suggest that the questionnaire does not strictly evaluate anxiety but, rather, negative affect.     

Collective Efficacy as a Mediator of the Trustworthiness – Performance Relationship in Computer-Mediated Team-based Contexts

The current study investigated the role of trustworthiness perceptions at the individual level and collective efficacy at the team level on team performance in computer-mediated teams using multi-level structural equation modeling (MSEM). It was hypothesized that trustworthiness perceptions and collective efficacy would predict team performance, and collective efficacy would partially mediate the trustworthiness – performance relationship in computer-mediated teams. Sixty-four teams (five participants each) engaged in a computer-mediated task across two experimental sessions. Trustworthiness measured after session 1, collective efficacy measured after sessions 1 and 2, and team performance measured of sessions 1 and 2 were used to build the MSEM. The half longitudinal model for assessing mediation was used to examine the influence of trustworthiness perceptions on performance through collective efficacy over time. Results demonstrated support for the hypothesized model, such that trustworthiness perceptions demonstrated indirect effects on performance through collective efficacy. These findings extend past research by identifying an emergent mechanism by which trustworthiness is important for team performance in computer-mediated teams.