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11.
Daniele Rugo 《Continental Philosophy Review》2015,48(3):391-396
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Cristiano De Marchis Maurizio Schmid Daniele Bibbo Ivan Bernabucci Silvia Conforto 《Human movement science》2013
The aim of this study was to investigate the muscle coordination underlying pedaling in untrained subjects by using the muscle synergies paradigm, and to connect it with the inter-individual variability of EMG patterns and applied forces. Nine subjects performed a pedaling exercise on a cycle-simulator. Applied forces were recorded by means of instrumented pedals able to measure two force components. EMG signals were recorded from eight muscles of the dominant leg, and Nonnegative Matrix Factorization was applied to extract muscle synergy vectors W and time-varying activation coefficients H. Inter-individual variability was assessed for EMG patterns, force profiles, and H. Four modules were sufficient to reconstruct the muscle activation repertoire for all the subjects (variance accounted for >90% for each muscle). These modules were found to be highly similar between subjects in terms of W (mean r = .89), while most of the variability in force profiles and EMG patterns was reflected, in the muscle synergy structure, in the variability of H. These four modules have a functional interpretation when related to force distribution along the pedaling cycle, and the structure of W is shared with that present in human walking, suggesting the existence of a modular motor control in humans. 相似文献
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Vincenzo Cestari Daniele Saraulli Pietro Spataro Alessandro Lega Antonio Sciarretta Valéria Rezende Marques Clelia Rossi-Arnaud 《Acta psychologica》2013,144(3):594-603
The present study investigated the use of perceptual binding processes in schizophrenic (SC) patients and matched healthy controls, by examining their performance on the recall of symmetrical (vertical, horizontal and diagonal) and asymmetrical patterns varying in length between 2 and 9 items. The results showed that, although SC patients were less accurate than controls in all conditions, both groups recalled symmetrical patterns better than asymmetrical ones. The impairment of SC patients was magnified with supra-span symmetrical arrays, and they were more likely to reproduce symmetrical patterns as asymmetrical, particularly at medium and high length levels. Hierarchical regression analyses further indicated that the between-group differences in the recall of supra-span vertical and horizontal arrays, which require a greater involvement of visual pattern processes, remained significant after removing the variance associated with performance on asymmetrical patterns, which primarily reflects intrafigural spatial processes. It is proposed that schizophrenia may be associated with a specific deficit in the formation and retrieval of the global visual images of studied patterns and in the use of the on-line information about the type of symmetry being tested to guide retrieval processes. 相似文献
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Laterality effects in the spinning dancer illusion: The viewing‐from‐above bias is only part of the story
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Chiara Lucafò Daniele Marzoli Giulia Prete Luca Tommasi 《British journal of psychology (London, England : 1953)》2016,107(4):698-709
The ‘silhouette illusion’, representing the silhouette of a female dancer pirouetting about her vertical axis, is a bistable stimulus created by Japanese web designer Nobuyuki Kayahara. Although the dancer can be perceived as spinning either clockwise or counterclockwise, the clockwise rotation is usually preferred. Troje and McAdam (i‐Perception, 2010, 1, 143) showed that this clockwise bias can be attributed to the tendency to assume a viewpoint from above rather than from below, given that the dancer is portrayed from a vantage point that is not perpendicular to the axis of rotation. Here, we tested whether another possible factor contributing to the observers’ interpretation of this bistable stimulus might be the tendency to perceive movements of the right rather than the left foot. We confirmed both the viewing‐from‐above bias and our hypothesis. The bias to perceive movements of the right leg might be a generalization to lower limbs of a perceptual frequency effect already observed for upper limbs. Such a perceptual and attentional bias towards the right hand/foot could account for the greater ability to predict the outcome of sport actions when observing right‐ rather than left‐limbed movements, and thus the left‐handers' and left‐footers' advantage observed in a variety of interactive sports. 相似文献
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Synthese - In an earlier paper the present author proved that de Finetti coherence is preserved under taking products of coherent books on two finite sets of independent events. Conversely, in this... 相似文献
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Philosophia - Victoria S. Harrison’s theory of internal pluralism approaches religious beliefs in terms of conceptual schemes. To her, this approach has the advantage of preserving core... 相似文献
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Daniele Scarpi 《Animal cognition》2011,14(1):127-136
Context-dependent choice is an important aspect of decision making. The paper examines context-dependent choice in cats (Felis catus), with particular reference to the effect of local context, on the basis of hypotheses developed in the field of human decision
making. Cats were initially confronted with two different feeding options. This binary choice set was later manipulated incorporating
a decoy that was better than the available options but ultimately unavailable (a phantom). By means of a within-subjects manipulation of phantom location in the attribute space, the author compared the effects
of close and distant phantoms on the final choices. The main finding is that close phantom decoys affected choice behavior
of cats by altering the overall share of the available options, leading some animals to reject even some of the available
feeding options, and by causing the animals to favor the available option that was more similar to the phantom decoy. No significant
effects emerged for phantoms that were far from the alternatives in the attribute space. The strengths of this paper lie in
its novel approach and high originality. No other study has used dominating decoys with animals or decoys that are unattainable.
This paper provides strong links to the human decision making literature, the presentation of the predictions of a range of
different choice models, and the novelty of the application to animals. The use of a phantom decoy is particularly interesting
because the phantom cannot actually be chosen, and thus the binary and trinary choice sets both have the very same choices
available. Overall, the effect of phantoms is real, interesting and new. 相似文献