Changes in recovery-stress state and performance in elite rowers during preparation for major competitions

This study investigated changes in the perceived recovery-stress state and performance in 6 highly trained Estonian rowers preparing for major competitions and representing Estonia in double sculls (age: M = 23.0, SD = 1.4 yr.; height: M = 198.0, SD = 0.0 cm; body mass: M = 97.1, SD = 6.4 kg), and quadruple sculls (age: M = 21.5, SD = 2.5 yr.; height: M = 189.5, SD = 5.4 cm; body mass: M = 90.9, SD = 4.8 kg). The subjects were training regularly and had been doing so for the last 10.5 yr. (double scullers, SD = 2.1 yr.) and 7.5 yr. (quadruple scullers, SD = 3.1 yr.), respectively. The Recovery-Stress Questionnaire for Athletes of Kellmann and Kallus was given two days before World Cup competitions. Standardized Stress and Standardized Recovery scores and RESTQ-Index were computed. In addition, resting cortisol in blood was measured at the same time. The performance of both boat classes constantly decreased from World Cup 1 to World Cup 3 as indicated by percent losses for winning boats. Resting cortisol and RESTQ-Index increased and decreased, respectively, at the same time. For double scullers, a decrease in RESTQ-Index mainly reflected the large decrease in the Standardized Recovery score. A decrease in RESTQ-Index was mainly based on a large increase in the Standardized Stress score for rowers performing in a quadruple scull. Present results indicate that the recovery-stress state affects performance of rowers in international competitions. RESTQ-Index could be used as the athletes' resource measure, while the Standardized Stress and Standardized Recovery scores reflect the athletes' extent of stress and recovery separately.     

Cognitive load causes people to react ineffectively to others' norm transgressions

We examined whether cognitive resources are necessary to react effectively to norm transgressions of others. In Study 1, we showed that a polite verbal expression of disapproval was the most effective form of social control because perpetrators were least likely to engage in the same norm transgression again in the future. In Study 2, we manipulated cognitive load and asked participants how they would react when witnessing different uncivil behaviors. Compared to participants in the cognitive load condition, participants in the control condition were more likely to use effective forms of social control and less likely to use ineffective forms of social control. The findings are integrated with recent theorizing about normative pressures and people's reactions to deviance.     

Cognitive load on working memory both encourages and discourages reasoning bias regarding the mental states of others

Theory of mind (ToM) refers to the ability to reason about the mental states of others. An increasing number of studies have revealed that working memory (WM) plays an important role in ToM. The present study applied WM loads to adults during a ToM task in order to investigate the impact on mental‐state reasoning performance. The task required participants to estimate the probabilities of several possible behaviours for a protagonist following the presentation of a ToM story. Participants were also required to maintain a meaningless two‐ (light WM load) or seven‐letter English alphabet string (heavy WM load) during story comprehension and mental‐state reasoning. The results show that the combination of light WM load applied during story comprehension with heavy WM load during mental‐state reasoning results in an overestimation of the probability that the protagonist's behaviour will accord with a participant's knowledge. Conversely, a heavy WM load applied during story comprehension, regardless of the type of WM load during mental‐state reasoning, did not result in this probability estimation bias. We discuss these findings from the perspective of a WM representation account.     

Differences between elite,junior and non-rowers in kinematic and kinetic parameters during ergometer rowing

This paper presents an analysis of the rowing parameters of differently skilled rowers. The study focuses on technique dependency on stroke rate. Five elite, five junior and five non-rowers participated, and the biomechanics of rowing on an ergometer was analyzed at stroke rates of 20, 26 and 34 str/min. The results show that elite rowers use a similar, consistent rowing technique at all stroke rates, the technique of junior rowers follows similar principles, while the technique of non-rowers varies. Elite rowers’ stroke length, handle motion and body posture do not change with stroke rate while the ratio of stroke phases, maximum forces, stroke work and joint loadings are constant at the same stroke rate but dependent on stroke rate. Junior rowers with stroke rate change also the stroke length. In non-rowers the differences can be observed in the handle motion and body posture during the stroke, their stroke length changes with stroke rate while the ratio of stroke phases stays constant. Although different movement execution is evident and variable with stroke rate, non-rowers demonstrate a consistent pattern at the same stroke rate. On the basis of the results, the crucial parameters that differentiate elite, junior, and non-rowers are identified.     

Cognitive load and the imagination effect

When presented with a procedure or concept to learn, imagining the procedure or concept may be an effective instructional technique compared to conventional studying, thus generating an imagination effect. However, it was hypothesized that the importance of learning through imagining as an instructional technique depends on modes of presentation. Experiment 1 tested adults studying or imagining contour maps as participants and was designed to verify the generality of the imagination effect. Imagination instructions were superior to study instructions on subsequent test questions. Experiment 2 further investigated the effect by comparing much younger students (Grade 4), studying or imagining temperature/time graphs presented in either a split‐attention (spatially separated diagram and text) or an integrated (spatially combined diagram and text) format. Results on a subsequent test indicated that the Grade 4 students found imagining beneficial to their learning, compared with studying the material but the effect was only obtained using an integrated rather than a split‐attention format. Experiment 3 was conducted to obtain verbal protocols from Grade 4 imagination and study groups using the same instructional materials to throw light on the cognitive mechanisms behind the imagination effect. Copyright © 2004 John Wiley & Sons, Ltd.     

A kinematic comparison of successful and unsuccessful tennis serves across the elite development pathway

While velocity generation is an obvious prerequisite to proficient tennis serve performance, it is also the only stroke where players are obliged to negotiate a unique target constraint. Therefore, the dearth of research attending to the accuracy component of the serve is surprising. This study compared the body, racquet and ball kinematics characterising successful serves and service faults, missed into the net, in two groups of elite junior female players and one professional female tennis player. Three-dimensional body, racquet and ball kinematics were recorded using a 22-camera VICON motion analysis system. There were no differences in body kinematics between successful serves and service faults, suggesting that service faults cannot be attributed to a single source of biomechanical error. However, service faults missing into the net are characterized by projection angles significantly further below the horizontal, implying that consistency in this end-point parameter is critical to successful performance. Regulation of this parameter appears dependent on compensatory adjustments in the distal elbow and wrist joints immediately prior to impact and also perceptual feedback. Accordingly, coordination of the distal degrees of freedom and a refined perception-action coupling appear more important to success than any isolated mechanical component of the service action.     

High perceptual load causes inattentional blindness and deafness in drivers

ABSTRACT

Perceptual load theory of attention predicts that the level of perceptual load in a primary task affects the processing of additional stimuli. Given the lack of ecologically valid evidence for the model, the current study assessed the effect of perceptual load on driver awareness during simulated driving tasks. The results showed that perceptual load dramatically affected driver awareness for visual and auditory stimuli, even those that were driving relevant and safety critical (e.g. pedestrians or the sound of a car horn). The results support load theory and suggest that perceptual load may be an important factor in driver safety.     

Cognitive load and semantic analogies: Searching semantic space

The aim of the present study is to investigate the performance of children of different ages on an analogymaking task involving semantic analogies in which there are competing semantic matches. We suggest that this can best be studied in terms of developmental changes in executive functioning. We hypothesize that the selection of common relational structure requires the inhibition of other salient features, in particular semantically related matches. Our results show that children's performance in classic A ∶ B ∶∶ C ∶ D analogy-making tasks seems to depend crucially on the nature of the distractors and the association strength between both the A and B terms and the C and D terms. These results agree with an analogy-making account (Richland, Morrison, & Holyoak, 2006) based on different limitations in executive functioning at different ages.     

The development of analogy making in children: Cognitive load and executive functions

The aim of the current study was to investigate the performance of 6-, 8-, and 14-year-olds on an analogy-making task involving analogies in which there are competing perceptual and relational matches. We hypothesized that the selection of the common relational structure requires the inhibition of other salient features, in particular, perceptual matches. Using an A:B::C:D paradigm, we showed that children’s performance in analogy-making tasks depends crucially on the nature of the distractors. Children chose more perceptual distractors having a common feature with C compared with A or B (Experiment 1). In addition, they were also influenced by unstructured random textures. When measuring reaction times instead of accurate responses, only the 8-year-olds’ reaction times were significantly influenced by perceptual distractors. The 6-year-olds seemed to select the first match they noticed, and the 14-year-olds were not influenced (or much less influenced) by featural distractors. These results are compatible with an analogy-making account based on varying limitations in executive functioning at different ages.     

Visuospatial attention lateralization in volleyball players and in rowers

In the present study, differences in visuospatial attention lateralization were evaluated in athletes engaged in open-compared to closed-skill sports and sedentary nonathletes. 23 volleyball players (open skill; Italian national level and regional level), 10 rowers (closed skill, Italian national level), and 23 sedentary participants responded to a computerized line-length judgment task. Five lines, differing in the length of their right and left segments, were randomly presented; the respondent made a forced-choice decision about the respective length of the two segments. Volleyball players responded significantly faster; those at the higher competitive level were also more accurate, making a statistically significantly lower number of leftward errors as compared with rowers and controls. If such responses are due to training rather than self-selection of ability, then the results may suggest the possibility of changing the distribution of visuospatial attention by training in open-skill sports.     

Cognitive load and person memory: the role of perceived group variability

Two studies investigated the effects of cognitive busyness and group variability on participants' memory for stereotype‐related information. In Study 1, participants formed an impression of an experimentally created group that was either homogeneous or heterogeneous in composition. While learning about the group, half of the participants were made cognitively busy, the others were not. The results supported our prediction that stereotypical efforts on memory are moderated by both the availability of processing resources and the variability of the target group under consideration. Under optimal processing circumstances, participants' recollections were dominated by the perceived variability of the group in question. That is, participants displayed preferential recall for stereotype‐consistent information when they believed the group to be homogeneous in composition, but a tendency to recall more stereotype‐inconsistent information when they considered the group to be heterogeneous in nature. Under sub‐optimal processing conditions, however, a different pattern emerged. Now, participants preferentially recalled stereotype‐consistent information regardless of the perceived variability of the group. These results were largely replicated in Study 2 when the perceived variability of a real social group was manipulated. We consider the implications of these findings for contemporary theories of stereotyping. Copyright © 1999 John Wiley & Sons, Ltd.     

Cognitive load theory,modality of presentation and the transient information effect

The modality effect occurs when audio/visual instructions are superior to visual only instructions. The effect was explored in two experiments conducted within a cognitive load theory framework. In Experiment 1, two groups of primary school students (N = 24) were presented with either audio/visual or visual only instructions on how to read a temperature graph. The group presented with visual text and a diagram rather than audio text and a diagram was superior, reversing most previous data on the modality effect. It was hypothesized that the reason for the reversal was that the transitory auditory text component was too long to be processed easily in working memory compared to more permanent written information. Experiment 2 (N = 64) replicated the experiment with the variation of a reduced length of both auditory and visual text instructions. Results indicated a reinstatement of the modality effect with audio/visual instructions proving superior to visual only instructions. Copyright © 2011 John Wiley & Sons, Ltd.     

Cognitive load and task condition in event- and time-based prospective memory: an experimental investigation

Prospective memory is memory for the realization of delayed intention. Researchers distinguish 2 kinds of prospective memory: event- and time-based (G. O. Einstein & M. A. McDaniel, 1990). Taking that distinction into account, the present authors explored participants' comparative performance under event- and time-based tasks. In an experimental study of 80 participants, the authors investigated the roles of cognitive load and task condition in prospective memory. Cognitive load (low vs. high) and task condition (event- vs. time-based task) were the independent variables. Accuracy in prospective memory was the dependent variable. Results showed significant differential effects under event- and time-based tasks. However, the effect of cognitive load was more detrimental in time-based prospective memory. Results also revealed that time monitoring is critical in successful performance of time estimation and so in time-based prospective memory. Similarly, participants' better performance on the event-based prospective memory task showed that they acted on the basis of environment cues. Event-based prospective memory was environmentally cued; time-based prospective memory required self-initiation.     

Age-related changes in selective attention and perceptual load during visual search

Three visual search experiments were conducted to test the hypothesis that age differences in selective attention vary as a function of perceptual load (E. A. Maylor & N. Lavie, 1998). Under resource-limited conditions (Experiments 1 and 2), the distraction from irrelevant display items generally decreased as display size (perceptual load) increased. This perceptual load effect was similar for younger and older adults, contrary to the findings of Maylor and Lavie. Distraction at low perceptual loads appeared to reflect both general and specific inhibitory mechanisms. Under more data-limited conditions (Experiment 3), an age-related decline in selective attention was evident, but the age difference was not attributable to capacity limitations as predicted by the perceptual load theory.     

A kinematic analysis of age-related changes in grasping to use and grasping to move common objects

Grasping is a complex action which requires high-level motor control. Although the impact of aging on grasping has been investigated in some studies, to date little is known as to how the aging process interacts with the purpose of the movement. The aims of the present study were (i) to investigate the effect of aging on grasping movements, and to explore on how this effect is modulated by (ii) the goal of the task, and by (iii) the characteristics of the target such as its location in the visual field, its orientation and its size. Young and elderly adults were asked to grasp to move or to grasp to use objects of different sizes and orientations, presented either in the central or the peripheral visual field. Movement duration did not differ between the two groups. However, elderly participants required a longer approach phase and showed a different grasping strategy, characterized by larger grip aperture and smaller percentage of wrist rotation in comparison to young adults. Elderly adults showed a decrease in accuracy when grasping objects presented in the peripheral, but not in the central visual field. A similar modulation of the kinematic parameters consisting in longer planning and execution phases in the grasp to use in comparison to the grasp to move condition was observed in both groups, suggesting that the effect of aging might be minimized and compensated in more goal-directed tasks.