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161.
The authors investigated the self-selected, overground walking patterns of 7 children (aged 11 months to 1 year, 5 months) at the initiation of walking (brand-new walkers [BNWs]) and for the next 6 months at 1-month intervals. Walking speed, stride length, and stride frequency increased significantly between the first 2 visits without significant changes in height and weight. The authors calculated sagittal plane angular accelerations of the center of mass over the foot for each step as an indicator of the escapement pulse. Results for the acceleration profiles changed after the 1st visit to positive, single-peaked accelerations that occurred < 0.20 s after initial foot contact. Increases in sagittal plane hip angular displacement and decreases in frontal plane pelvic angular displacement were observed. The pattern changes suggest that children quickly discover appropriately timed and directed escapements that initiate and support the conservative sagittal plane pendulum and spring dynamics observed in older children. 相似文献
162.
The recent untimely illness and death of Steven W. Keele is a great loss for psychology in general and for the field of motor control in particular. Steve Keele was a pioneer in the study of the psychological processes and neural mechanisms underlying attention and motor control. Steve was a Consulting Editor for the Journal of Motor Behavior from 1969 to 1974 and served on the Editorial Board from 1974 to 1977, and again from 1980 until his retirement in 1997. Steve served as head of the University of Oregon Psychology Department from 1992-1995, and, although he retired in 1997, he continued to perform important research until he became ill in early 2005. 相似文献
163.
In this study, an extended pacemaker-counter model was applied to crossmodal temporal discrimination. In three experiments, subjects discriminated between the durations of a constant standard stimulus and a variable comparison stimulus. In congruent trials, both stimuli were presented in the same sensory modality (i.e., both visual or both auditory), whereas in incongruent trials, each stimulus was presented in a different modality. The model accounts for the finding that temporal discrimination depends on the presentation order of the sensory modalities. Nevertheless, the model fails to explain why temporal discrimination was much better with congruent than with incongruent trials. The discussion considers possibilities to accommodate the model to this and other shortcomings. 相似文献
164.
Mayr U 《Psychonomic bulletin & review》2002,9(1):93-99
Inhibition is often proposed as an important executive-control process, but its existence is difficult to establish empirically. Recently, Mayr and Keele (2000) reported that it takes longer to switch to a recently disengaged task set (i.e.,n−2 task-set repetitions) than to a less recently disengaged task set. Thissetalternation cost may indicate inhibition of the disengaged task set. The primary goal of the present study was to test the inhibition account of set-alternation costs against an important alternative account based on automatic episodic retrieval. The episodic retrieval account predicts reaction time facilitation instead of costs for the special case ofcomplete n−2 repetitions of both task sets and all stimulus— response aspects. A new task-switching paradigm, in which action rules varied on a trial-by-trial basis while the relevant stimulus dimension remained invariant, allowed the implementation of a high proportion of completen−2 repetitions. Consistent with the inhibition view, set-alternation costs were obtained even for these constellations. 相似文献
165.
Ulrich Berns 《Forum der Psychoanalyse》2001,17(4):312-331
166.
Studies in East European Thought - 相似文献
167.
To examine the nature of the information that guides eye movements to previously read text during reading (regressions), we used a relatively novel technique to request a regression to a particular target word when the eyes reached a predefined location during sentence reading. A regression was to be directed to a close or a distant target when either the first or the second line of a complex two-line sentence was read. In addition, conditions were created that pitted effects of spatial and linguistic distance against each other. Initial regressions were more accurate when the target was spatially near, and effects of spatial distance dominated effects of verbal distance. Initial regressions rarely moved the eyes onto the target, however, and subsequent "corrective" regressions that homed in on the target were subject to general linguistic processing demands, being more accurate during first-line reading than during second-line reading. The results suggest that spatial and verbal memory guide regressions in reading. Initial regressions are primarily guided by fixation-centered spatial memory, and corrective regressions are primarily guided by linguistic knowledge. 相似文献
168.
In several areas of personality research (e.g., personal networks, interpersonal behaviour, academic effort), the empirical data represent a multilevel structure, in which within-person variables are nested within individuals. Both within-person variation and between-person differences can be related to outcome variables (e.g., emotions, life satisfaction). One major precondition for aggregating within-person data to the between-person level is sufficient reliability of the aggregated data, a point that has received scant attention in previous research. Drawing on the example of personal goal research, we recommend that the two major forms of the intraclass correlation coefficient—the ICC(1) and the ICC(2)—be applied to within-person data in idiographic research designs. These indices allow the homogeneity and reliability of within-person data to be determined separately. Their application is illustrated using data from a study with 4,565 young adults. 相似文献
169.
Jentzsch I Leuthold H Ulrich R 《Journal of experimental psychology. Human perception and performance》2007,33(3):610-626
The mechanism underlying the reaction time (RT2) slowing to the 2nd of 2 successively presented stimuli (S1 and S2) in the psychological refractory period paradigm was investigated. Stimulus onset synchrony (SOA) between S1 and S2, contrast of S2, and Task 2 set-level compatibility was manipulated. Specifically, the authors used a psychophysiological approach to examine RT2 slowing in trials in which the reaction time to S1 (RT1) was shorter than the SOA. For trials with RT1 < SOA, the clear decrease in RT2 with increasing SOA was underadditive with the S2 contrast effect, but additive with compatibility. Electrophysiological measures revealed an exclusively premotoric locus of RT2 slowing. These findings indicate that a central bottleneck stage is occupied for some period after response to S1 execution, consistent with an extended response selection bottleneck account. 相似文献
170.
Knowledge about suicide might be positively correlated with local suicide prevalence. This hypothesis was tested with a sample of 107 medical and social science undergraduates from Estonia, a country with a high suicide rate, using Hubbard and McIntosh's 1992 Revised Facts on Suicide Quiz. Compared (independent-groups t tests) with a sample of undergraduates from Austria, which has a markedly lower suicide rate, Estonians presented significantly higher overall knowledge about suicide (d = 0.39), particularly concerning demographic and epidemiological facts about suicide (d = 0.77) but not pertaining to clinical and interpersonal knowledge contents (d = -0.06). Study limitations and suggestions for extension of this preliminary inquiry are discussed. 相似文献