Sequential Performance in Young and Older Adults: Evidence of Chunking and Inhibition

ABSTRACT

Two experiments were conducted to examine possible sources of age-related decline in sequential performance: age differences in sequence representation, retrieval of sequence elements, and efficiency of inhibitory processes. Healthy young and older participants learned a sequence of eight animal drawings in fixed order, then monitored for these targets within trials of mis-ordered stimuli, responding only when targets were shown in the correct order. Responses were slower for odd numbered targets, suggesting that participants spontaneously organized the sequence in two-element chunks. Perseverations (responses to previously relevant targets) served as an index of inhibitory inefficiency. Efficiency of chunk retrieval and self-inhibition were lower for older than for younger adults. Increasing environmental support in Experiment 2 through overt articulation of current chunk elements showed a pattern of results similar to Experiment 1, with particular benefit for older adults. The findings suggest an underlying susceptibility to interference in old age.     

The association between maternal strategies and preschoolers' memory for location of objects

Using a Vygotskian theoretical framework and a social interaction design, we observed 30 middle-class North American mother–child dyads engaged in a location memory activity. The central aim of this investigation was to assess maternal and preschool strategy use employed during a memory for location task, and to determine which strategies are associated with preschooler accuracy of memory for location of objects. Results suggest that mothers are more apt to utilize labelling, encouragement, and guidance as opposed to location-specific assistance to their child during the task, and children are more apt to link the memory information to their real-life experiences, request help for assistance, and utilize self-regulatory speech. Implications of the research, suggestions for future research, and expansions of theoretical perspectives on the role of social interaction on preschool location memory performance, and educational implications are discussed.     

A possible physiological correlate for mental flow

The relationship between mental flow and physiological coherence was investigated in three tasks. Coherence is a state defined by a particular pattern of low frequency heart rate variability (HRV), which has been related to optimal performance and positive mental states. Flow is a pleasurable performance-enhancing psychological state. In the first task, participants answered questionnaires. In the second, they played a coherence-inducing biofeedback game, and in a third, they played a flow-inducing videogame. HRV was used to measure coherence while flow was assessed using the Flow State Scales. The data revealed that coherence could be induced without flow and vice versa. More surprising, the correlations between flow and coherence were different in each of the tasks. We conclude that coherence and flow are discrete constructs despite their theoretical similarities.     

Happy-productive groups: How positive affect links to performance through social resources

Abstract

The current study extends the Broaden & Build theory to the collective (i.e. groups) level of analysis, focusing on the mediating role of group social resources (i.e. cohesion, coordination, teamwork, supportive team climate) between group positive affect (i.e. enthusiasm, optimism, satisfaction, comfort) and group performance (i.e. in-and extra-role performance, creative performance). To test our hypotheses, we conducted two studies using independent samples. Study 1 is a laboratory study with 449 participants nested in 112 small groups who performed an organizational simulation creative task. Study 2 is a field study that aggregated scores of 2159 employees nested in 417 groups. In both the lab and field studies, structural equation modeling results revealed that group social resources fully mediate the relationship between group positive emotions and performance.     

Temporal coordination between performing musicians

Many common behaviours require people to coordinate the timing of their actions with the timing of others' actions. We examined whether representations of musicians' actions are activated in coperformers with whom they must coordinate their actions in time and whether coperformers simulate each other's actions using their own motor systems during temporal coordination. Pianists performed right-hand melodies along with simple or complex left-hand accompaniments produced by themselves or by another pianist. Individual performers' preferred performance rates were measured in solo performance of the right-hand melody. The complexity of the left-hand accompaniment influenced the temporal grouping structure of the right-hand melody in the same way when it was performed by the self or by the duet partner, providing some support for the action corepresentation hypothesis. In contrast, accompaniment complexity had little influence on temporal coordination measures (asynchronies and cross-correlations between parts). Temporal coordination measures were influenced by a priori similarities between partners' preferred rates; partners who had similar preferred rates in solo performance were better synchronized and showed mutual adaptation to each other's timing during duet performances. These findings extend previous findings of action corepresentation and action simulation to a task that requires precise temporal coordination of independent yet simultaneous actions.     

The influence of dimensional overlap on location-related priming in the Simon task

Choice reaction times are shorter when stimulus and response locations are compatible than when they are incompatible as in the Simon effect. Recent studies revealed that Simon effects are strongly attenuated when there is temporal overlap with a different high-priority task, accompanied by a decrease of early location-related response priming as reflected in the lateralized readiness potential (LRP). The latter result was obtained in a study excluding overlap of stimulus location with any other dimension in the tasks. Independent evidence suggests that location-related priming might be present in conditions with dimensional overlap. Here we tested this prediction in a dual-task experiment supplemented with recording LRPs. The secondary task was either a standard Simon task where irrelevant stimulus location overlapped with dimensions of the primary task or a Stroop-like Simon task including additional overlap of irrelevant and relevant stimulus attributes. At high temporal overlap, there was no Simon effect nor was there stimulus-related response priming in either condition. Therefore stimulus-triggered response priming seems to be abolished in conditions of limited capacity even if the likelihood of an S–R compatibility effect is maximized.     

Ageing and attentional control

The research examines the structural bottleneck account and the resource account of the substantial dual-task deficits among older adults. Procedures from two common dual-task methodologies—the psychological refractory period and the relative-priority manipulation—were used to encourage maximization of the joint performance. Performance and time-sharing strategies from subjects between the ages of 20 and 70 years were examined. Age-related declines in time-sharing efficiency and in the precision of the executive control process were observed. The age-related effect was larger when two manual responses were required than when one manual and one vocal response were required, but no evidence for obligatory sequential processing was found. Except for the most demanding conditions, comparable practice effects were observed between the younger and older subjects, suggesting considerable cognitive plasticity in the older subjects. Implications for the two attentional accounts were discussed.     

Fairness And Performance-Enhancing Swimsuits AT The 2009 Swimming World Championships: The ‘Asterisk’ Championships

The use of polyurethane swimsuits at the 2009 World Aquatics Championships resulted in world records being set for almost all swimming events. This paper explores the implications that the use of these performance-enhancing swimsuits had on fairness in relative and absolute outcomes in swimming. I claim that the use of ‘super swimsuits’ unfairly influenced relative outcomes within the competition because not all swimmers used, or had access to, the same types of swimsuit (some of which were clearly ‘faster’ than others). Furthermore, I claim that the use of performance-enhancing swimsuits by current competitors unfairly influences inter-temporal relative outcomes. It is evident that competitors and coaches in elite swimming place great importance on making inter-temporal comparisons on the basis of absolute outcomes in the sport (as measured by a swimmer's race time). A ban on the use of super swimsuits may be justified in order to preserve the fairness of such inter-temporal comparisons, and records set using performance-enhancing swimsuits at the 2009 World Championships should be demarcated from others.     

Review of The Supervisor's Guidebook: Evidence-Based Strategies for Promoting Work Quality and Enjoyment Among Human Service Staff (2nd edition) by Dennis Reid,Marsha Parsons,and Carolyn Green

This article summarizes a review of the book The Supervisor's Guidebook: Evidence-Based Strategies for Promoting Work Quality and Enjoyment Among Human Service Staff (2nd edition) by Reid, Parsons, and Green. We describe the book's organization and content. In addition, strengths and areas for improvement are noted. The book provides rich, relevant content to guide supervisory practices within a participative, evidence-based approach that could be applied in various human service settings.     

Solo status, stereotype threat, and performance expectancies: Their effects on women’s performance

Women working in male-dominated environments may find themselves to be the only woman present, and that negative stereotypes about women persist in the environment. This experiment tested women’s performance in solo status (SS: being the only woman present) and under stereotype threat (ST: when women are stereotyped as poor performers). White male and female participants (157) learned information, then tested on it in an opposite-gender (SS) or same-gender group (nonsolo). In addition, the information was described as being traditional math material (ST) or a type of math information impervious to gender stereotypes (no threat). Women performed more poorly in SS than nonsolos, and under ST than no threat. Experiencing both factors was more detrimental to women’s performance than experiencing one or the other. Men’s performance was the same across all conditions. Performance expectancies partially mediated the effect of SS, but not ST, on performance.