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101.
ObjectivesThe rating of perceived exertion (RPE) and the heart rate (HR) have been widely studied and monitored during exercise, but their hysteresis behaviour is still unexplored. Our aim was to study the hysteresis behaviour of RPE and HR in triathletes and non-athletes.DesignCross-sectional study.MethodEighteen triathletes at different competitive levels (elite n = 9, non-elite n = 9) and ten students were tested while cycling and running, using a pyramidal protocol (incremental/decremental workloads). The hysteresis area, considered positive when values of the dependent variables (RPE and HR) at the same workload were higher in the decremental phase than in the incremental phase, and vice versa for the negative areas, was calculated in all tests. The Wilcoxon matched-pairs test and Kruskal Wallis ANOVA were applied to detect intra- and inter-group differences, respectively, of RPE and HR values during the incremental and decremental phases, as well as between cycling and running.ResultsThe following results were observed: a) an incoherent relationship of RPE with HR and workload, b) positive hysteresis areas of RPE and HR in all groups during cycling and running, c) a partial negative hysteresis area of RPE, but not of HR, in the triathlete groups, d) larger hysteresis areas of RPE and HR in students than in triathletes, and e) larger hysteresis areas in cycling than in running.Conclusionsthe study of the hysteresis behaviour of RPE and HR reveals the history dependency of both variables, highlights their incoherent or non-unique relationship during a pyramidal exercise, and questions their widely assumed linear association to workload intensity. The hysteresis area is proposed as a new non-invasive marker of exercise stress and tolerance that should be further investigated. 相似文献
102.
Organizations often communicate seemingly paradoxical strategic imperatives to their employees that reflect a focus on promotion (take risks) and prevention (be prudent), as outlined by regulatory focus theory. When consistently emphasized and reinforced in an organization, these strategic inclinations can emerge as divergent climates for promotion and prevention that cloud the organization's perceived identity and reduce collective organizational commitment among employees. With a coherent organizational identity acting as both a sensemaking tool and a means of potential self-enhancement for employees, we use social identity theory to hypothesize that similarly emphasized promotion and prevention climates are negatively related to employees’ collective organizational commitment and indirectly, negatively related to organizational productivity. We test our hypotheses in a sample of 107 manufacturing organizations, using polynomial regression with response surface analysis to examine how similarly emphasized promotion and prevention climates relate to collective commitment and organizational productivity. Our analyses reveal that as organization-level promotion and prevention climate scores became more similar, collective organizational commitment decreases. Furthermore, we find that similarly emphasized promotion and prevention climates are negatively related to organizational productivity via collective commitment. We reconcile these findings with the organizational paradox and ambidexterity literatures and implicate promising avenues for future research. 相似文献
103.
Syntactic, prosodic, and semantic processes in the brain: evidence from event-related neuroimaging 总被引:2,自引:0,他引:2
Friederici AD 《Journal of psycholinguistic research》2001,30(3):237-250
The neural network supporting aspects of syntactic, prosodic, and semantic information processing is specified on the basis of two experiments using functional magnetic resonance imaging (fMRI). In these two studies, the presence/absence of lexical-semantic and syntactic information is systematically varied in spoken language stimuli. Inferior frontal and temporal brain areas in the left and the right hemisphere are identified to support different aspects of auditory language processing. Two additional experiments using event-related brain potentials investigate the possible interaction of syntactic and prosodic information, on the one hand, and syntactic and semantic information, on the other. While the first two information types were shown to interact early during processing, the latter two information types do not. Implications for models of auditory language comprehension are discussed. 相似文献
104.
Canadian university students (n=48) solved simple addition problems in a true/false verification task with equations in digit format (3+4=8) or written English format (three+four=eight). Participants reported their solution strategy (e.g. retrieval or calculation) after each trial. Reported use of calculation strategies was much greater with word (41%) than digit stimuli (26%), and this difference was exaggerated for numerically larger problems. Word-format costs on reaction time (RT) were correspondingly greater for large than for small problems, but this Format×Size RT effect was bigger for true than for false equations. The results demonstrate that surface format affects central, rather than only peripheral, stages of cognitive arithmetic. 相似文献
105.
Martha W. Burton 《Cognitive Science》2001,25(5):695-709
Recent neuroimaging studies of language processing are examining the neural substrate of phonology because of its critical role in mapping sound information onto higher levels of language processing (e.g., words) as well as providing codes in which verbal information can be temporarily stored in working memory. However, the precise role of the inferior frontal cortex in spoken and written phonological tasks has remained elusive. Although lesion studies have indicated the presence of selective deficits in phonological processing, the location of lesions underlying these impairments has not revealed a consistent pattern. Despite efforts to refine methods and tasks, functional neuroimaging studies have also revealed variability in activation patterns. Reanalysis of evidence from these neuroimaging studies suggests that there are functional subregions within the inferior frontal gyrus that correspond to specific components of phonological processing (e.g., orthographic to phonological conversion in reading, and segmentation in speech). 相似文献
106.
107.
108.
大学生生活满意度与主观幸福感关系的文化效应检验 总被引:1,自引:0,他引:1
采用《国际大学调查》对48个国家和地区的10018名大学生进行施测,文章考察了生活满意度和主观幸福感的关系,并分析了文化因素在其中的影响。结果发现:(1)不同国家大学生的主观幸福感、一般和具体领域生活满意度水平均存在差异;(2)大学生具体领域生活满意度与主观幸福感和一般生活满意度在个体水平上的相关比在国家水平上的相关低;(3)在个体和国家水平上,大学生主观幸福感的影响因素不同。结论:文化因素影响了大学生生活满意度与主观幸福感的关系。 相似文献
109.
In the debate between expertise and domain-specific explanations of "special" processing for faces, a common belief is that behavioural studies support the expertise hypothesis. The present article refutes this view, via a combination of new data and review. We tested dog experts with confirmed good individuation of exemplars of their breed-of-expertise. In all experiments, standard results were confirmed for faces. However, dog experts showed no face-like processing for dogs on three behavioural tasks (inversion; the composite paradigm; and sensitivity to contrast reversal). The lack of holistic/configural processing, indicated in the first two of these tests, is shown by review to be consistent rather than inconsistent with previous studies of objects-of-expertise. 相似文献
110.
We present a new mathematical notion, dissimilarity function, and based on it, a radical extension of Fechnerian Scaling, a theory dealing with the computation of subjective distances from pairwise discrimination probabilities. The new theory is applicable to all possible stimulus spaces subject to the following two assumptions: (A) that discrimination probabilities satisfy the Regular Minimality law and (B) that the canonical psychometric increments of the first and second kind are dissimilarity functions. A dissimilarity function Dab for pairs of stimuli in a canonical representation is defined by the following properties: (1) a≠b?Dab>0; (2) Daa=0; (3) If and , then ; and (4) for any sequence {anXnbn}n∈N, where Xn is a chain of stimuli, DanXnbn→0?Danbn→0. The expression DaXb refers to the dissimilarity value cumulated along successive links of the chain aXb. The subjective (Fechnerian) distance between a and b is defined as the infimum of DaXb+DbYa across all possible chains X and Y inserted between a and b. 相似文献