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The Psychological Record - 相似文献
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Two models, a Poisson race model and a diffusion model, are fit to data from a perceptual matching task. In each model, information
about the similarity or the difference between two stimuli accumulates toward thresholds for either response. Stimulus variables
are assumed to influence the rate at which information accumulates, and response variables are assumed to influence the level
of the response thresholds. Three experiments were conducted to assess the performance of each model. In Experiment 1, observers
performed under different response deadlines; in Experiment 2, response bias was manipulated by changing the relative frequency
ofsame anddifferent stimuli. In Experiment 3, stimulus pairs were presented at three eccentricities: foveal, parafoveal, and peripheral. We examined
whether the race and diffusion models could fit the response time and accuracy data through changes only in response parameters
(for Experiments 1 and 2) or stimulus parameters (for Experiment 3). Comparisons between the two models suggest that the race
model, which has not been studied extensively, can account for perceptual matching data at least as well as the diffusion
model. Furthermore, without the constraints on the parameters provided by the experimental conditions, the diffusion and the
race models are indistinguishable. This finding emphasizes the importance of fitting models across several conditions and
imposing logical psychological constraints on the parameters of models. 相似文献
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Tom Melai Nicolaas C. Schaper T. Herman IJzerman Ton L.H. de Lange Paul J.B. Willems Kenneth Meijer Aloysius G. Lieverse Hans H.C.M. Savelberg 《Human movement science》2013,32(4):785-793
The aim of this study was to identify the cascade of effects leading from alterations in force generation around the ankle joint to increased plantar pressures under the forefoot. Gait analysis including plantar pressure measurement was performed at an individually preferred and a standardized, imposed gait velocity in diabetic subjects with polyneuropathy (n = 94), without polyneuropathy (n = 39) and healthy elderly (n = 19). The plantar flexion moment at 40% of the stance phase was negatively correlated with the displacement rate of center of pressure (r = ?.749, p < .001 at the imposed, and r = ?.693, p < .001 at the preferred gait velocity). Displacement rate of center of pressure was strongly correlated with forefoot loading (r = ?.837, p < .001 at the imposed, and r = ?.731, p < .001 at the preferred gait velocity). People with a relatively high plantar flexion moment at 40% of the stance phase, have a faster forward transfer of center of pressure and consequently higher loading of the forefoot. This indicates that interventions aimed at increasing the control of the roll-off of the foot may contribute to a better plantar pressure distribution. 相似文献