Talking and Thinking With Our Hands

ABSTRACT— When people talk, they gesture. Typically, gesture is produced along with speech and forms a fully integrated system with that speech. However, under unusual circumstances, gesture can be produced on its own, without speech. In these instances, gesture must take over the full burden of communication usually shared by the two modalities. What happens to gesture in this very different context? One possibility is that there are no differences in the forms gesture takes with speech and without it—that gesture is gesture no matter what its function. But that is not what we find. When gesture is produced on its own and assumes the full burden of communication, it takes on a language-like form. In contrast, when gesture is produced in conjunction with speech and shares the burden of communication with that speech, it takes on an unsegmented, imagistic form, often conveying information not found in speech. As such, gesture sheds light on how people think and can even play a role in changing those thoughts. Gesture can thus be part of language or it can itself be language, altering its form to fit its function.     

Beyond inattentional blindness and attentional misdirection: From attentional paradigms to attentional mechanisms

Memmert (2010) tried to foster the development of attentional research by discussing four differences between attentional misdirection (AM) and inattentional blindness (IB). Considering this goal, the comment was received in the intended way by the comments of (Most, 2010) and (Moran and Brady, 2010) who make a number of highly valuable suggestions for further progress. As initially suggested by Memmert (2010) this dialog should help unravel the underlying attentional mechanisms of different paradigms. Therefore, we first discuss the suggested distinction between central and spatial IB by Most (2010). Second, we argue that working memory and perceptual load research seem particularly interesting in this regard and should be taken into consideration when conducting future research along the lines of IB and AM. Third, representative task designs can be an important mosaic piece in across-the-board attention theories and highly useful for deriving further testable hypothesis in naturalistic settings. The most important claim of all commentaries in this issue is that the proposed ideas can all be empirically tested and thereby contribute to the advancement of an unified theoretical framework incorporating IB, AM in consideration of overt and covert attention mechanisms.     

Psychosocial work factors, physical work load and associated musculoskeletal symptoms among home care workers

This study was based on a questionnaire and included a group of home care workers (HCW) (n = 305) and a reference group of municipal employees (n = 694). The relationship between the work environment and musculoskeletal symptoms was analysed. The HCW were less satisfied with their control over their work and stimulus from their work and had a higher physical work load and prevalence of musculoskeletal symptoms, compared with the reference group. The Rate Ratio (RR) of neck and shoulder symptoms among HCW was 83 and 54 %, respectively, higher among those reporting a "high" psychological work load compared with those reporting a "low" load. The highest RR for a single risk indicator was 2.5, and this concerned low-back symptoms among HCW who often worked with twisted postures. A combination of "poor" psychosocial work environment and "high" physical work load produced the highest RR for work-related neck (RR = 2.57) and shoulder (RR = 2.13) symptoms.     

Effects of information accuracy and volume on decision making

Recent advances in information technology have resulted in increasingly complex work environments. Much of the complexity is due to a deluge of information available across networks (Gleick, 2011) and unknown reliability, which introduces additional uncertainty (Platt & Huettel, 2008). Understanding the performance characteristics of human information processing for optimal decision making under such conditions of data abundance and uncertainty is critical in complex networked information environments, such as military operations. One focus of the United States military is providing troops with the richness of information formally reserved for higher echelons (Bawden & Robinson, 2009). However, this effort risks cognitive overload, where too much information can result in impaired performance. The present study examined human decision making under varying levels of cognitive load and source reliability. Participants determined the reliability of two information sources and decided how to use them to minimize cognitive load and improve performance in a visual search task. Unbeknownst to participants, one source provided highly accurate information and one provided moderately accurate information. Results showed that participants had more trust in the more accurate than the less accurate source, and decision making accuracy decreased as cognitive load increased. When cognitive load was highest, participants were more accurate on trials with the more accurate source. Thus, the more accurate source facilitated better performance, whether through better intel or through participants offloading some of the cognitive load to the reliable source.     

Baselining affects the production of deceptive narratives

Recent research shows that the quality of a baseline (i.e., the analysis of one's behavior in normal conditions) decreases when the second narrative is expected and deceitful. However, a first step would be to investigate whether the writing of a first narrative might influence the second, independently of its expectancy. In this study, we hypothesized that second narratives would be less detailed, especially if these narratives are deceptive. Participants (N = 71) were asked to narrate two consecutive truthful and deceptive narratives. The second narrative was unexpected, and the order of the narratives was counterbalanced. Results suggest a detrimental effect of deceptiveness and order on the frequency of details. Moreover, an interaction was observed, suggesting when narratives are written after a first one, the frequency of details decreases, all the more if they were deceptive. The results of this experiment are discussed from both a theoretical and an applied perspective.     

Cumulative lifetime stress exposure,depression, anxiety,and well-being in elite athletes: A mixed-method study

Research suggests that elite athletes are at increased risk of poor mental health, partly due to the intense demands associated with top-level sport. Despite growing interest in the topic, the factors that influence the mental health and well-being of elite athletes remain unclear. From a theoretical perspective, the accumulation of stress and adversity experienced over the life course may be an important factor. To investigate this possibility, we employed a mixed-method design to: (a) examine whether cumulative lifetime stress predicted depression, anxiety, and well-being in elite athletes; and (b) help explain why cumulative lifetime stress exposure might have resulted in poor mental health and well-being. Ninety-five elite athletes (M_age = 29.81, SD = 10.88) completed the Stress and Adversity Inventory, Patient Health Questionnaire, Generalized Anxiety Disorder 7-item scale, and the Scales of General Well-Being. Hierarchical regression analyses revealed that total count and severity of lifetime stressor exposure significantly predicted greater depression (β = .42, p < .001; β = .46, p < .001) and anxiety symptoms (β = .34, p = .003; β = .28, p = .018), and worse well-being (β = -.42, p < .001; β = -.30, p = .015). Semi-structured interviews were then conducted with six athletes. Thematic analysis revealed that cumulative lifetime stress exposure fostered poor mental health and well-being by promoting maladaptive long-term coping strategies, increasing susceptibility to future stress, and limiting interpersonal relationships. We believe these findings can help practitioners identify, and intervene accordingly with, elite athletes at risk of experiencing stress-related mental health problems.     

多媒体学习中线索原则是否存在经验逆转效应?——来自两项元分析的证据

经验逆转效应指出,对低先备知识者学习有积极作用的教学设计可能对高先备知识者无效,甚至有消极影响。本研究分别对高、低先备知识者进行关于线索对其学习过程中主观认知负荷及学习结果影响的元分析,检验线索原则是否存在经验逆转效应及认知负荷理论能否解释线索原则的经验逆转效应。结果表明,线索能降低低先备知识者学习过程中的主观认知负荷并促进其学习表现;但线索对高先备知识者认知负荷及学习成绩的总效应均不显著。结合元分析结果,本研究证明了在多媒体学习环境下线索原则存在部分经验逆转,且部分支持了线索原则经验逆转效应的认知负荷理论解释。     

Manual motor reaction while being absorbed into popular music

In three experiments, we investigated the behavioral consequences of being absorbed into music on performance in a concurrent task. We tested two competing hypotheses: Based on a cognitive load account, captivation of attention by the music and state absorption might slow down reactions in the decisional task. Alternatively, music could induce spontaneous motor activity, and being absorbed in music might result in a more autonomous, flow-driven behavior with quicker motor reactions. Participants performed a simple, visual, two-alternative forced-choice task while listening to popular musical excerpts. Subsequently, they rated their subjective experience using a short questionnaire. We presented music in four tempo categories (between 80 and 140 BPM) to account for a potential effect of tempo and an interaction between tempo and absorption. In Experiment 1, absorption was related to decreased reaction times (RTs) in the visual task. This effect was small, as expected in this setting, but replicable in Experiment 2. There was no effect of the music’s tempo on RTs but a tendency of mind wandering to relate to task performance. After slightly changing the study setting in Experiment 3, flow predicted decreased RTs, but absorption alone — as part of the flow construct — did not predict RTs. To sum up, we demonstrated that being absorbed in music can have the behavioral consequence of speeded manual reactions in specific task contexts, and people seem to integrate the music into an active, flow-driven and therefore enhanced performance. However, shown relations depend on task settings, and a systematic study of context is necessary to understand how induced states and their measurement contribute to the findings.     

Time and direction preparation of the long latency stretch reflex

This study investigated time and direction preparation of motor response to force load while intending to maintain the finger at the initial neutral position. Force load extending or flexing the index finger was given while healthy humans intended to maintain the index finger at the initial neutral position. Electromyographic activity was recorded from the first dorsal interosseous muscle. A precue with or without advanced information regarding the direction of the forthcoming force load was given 1000 ms before force load. Trials without the precue were inserted between the precued trials. A long latency stretch reflex was elicited by force load regardless of its direction, indicating that the long latency stretch reflex is elicited not only by muscle stretch afferents, but also by direction-insensitive sensations. Time preparation of motor response to either direction of force load enhanced the long latency stretch reflex, indicating that time preparation is not mediated by afferent discharge of muscle stretch. Direction preparation enhanced the long latency stretch reflex and increased corticospinal excitability 0–20 ms after force load when force load was given in the direction stretching the muscle. These enhancements must be induced by preset of the afferent pathway mediating segmental stretch reflex.