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Journal of Indian Council of Philosophical Research - One rather common way of doing philosophy involves what is called “the method of cases,” where philosophers design hypothetical... 相似文献
945.
Evaluation–apprehension and distraction–conflict have typically been treated as alternative explanations for social facilitation. The present study tested both theories under a single design. The study examined (a) whether each explanation predicted social‐facilitation performance outcomes and (b) whether combining evaluation and distraction manipulations produced even greater performance outcomes. The present study also explored whether physical presence is necessary to produce social‐facilitation effects when evaluation and distraction manipulations are already present. The study found significant facilitation effects on the simple task only in the evaluation–apprehension condition. Significant performance impairment was found for both evaluation and distraction. Combining evaluation with distraction led to greater effects only on the complex task. Furthermore, physical presence does not appear necessary to produce social‐facilitation effects. 相似文献
946.
The onset of motion captures attention during visual search even if the motion is not task relevant, which suggests that motion onsets capture attention in a stimulus-driven manner. However, we have recently shown that stimulus-driven attentional capture by abruptly appearing objects is attenuated under conditions of high perceptual load. In the present study, we examined the influence of perceptual load on attentional capture by another type of dynamic stimulus: the onset of motion. Participants searched for a target letter through briefly presented low- and high-load displays. On each trial, two irrelevant flankers also appeared, one with a motion onset and one that was static. Flankers defined by a motion onset captured attention in the low-load but not in the high-load displays. This modulation of capture in high-load displays was not the result of overall lengthening of reaction times (RTs) in this condition, since search for a single low-contrast target lengthened RTs but did not influence capture. These results, together with those of previous studies, suggest that perceptual load can modulate attentional capture by dynamic stimuli. 相似文献
947.
Joshua Gert 《No?s (Detroit, Mich.)》2010,44(4):669-690
948.
Joshua Spencer 《Philosophical Studies》2010,148(2):167-181
A material simple is a material object that has no proper parts. Some philosophers have argued for the possibility of extended
simples. Some have even argued for the possibility of heterogeneous simples or simples that have intrinsic variations across
their surfaces. There is a puzzle, though, that is meant to show that extended, heterogeneous simples are impossible. Although
several plausible responses have been given to this puzzle, I wish to reopen the case against extended, heterogeneous simples.
In this paper, I briefly canvass responses to this puzzle which may be made in defense of extended, heterogeneous simples.
I then present a new version of this puzzle which targets simples that occupy atomic yet extended regions of space. It seems
that none of the traditional responses can be used to successfully save this particular kind of extended simple from the new
puzzle. I also consider some non-traditional defenses of heterogeneous extended simples and argue that they too are unsuccessful.
Finally, I will argue that a substantial case can be made against the possibility of extended heterogeneous simples of any
kind. 相似文献
949.
Researchers have used several different types of illusory contours to investigate properties of human perception. One rarely used illusory contour is a combination of the abutting grating and Kanizsa illusions. We call this the offset-arcs illusion and provide an empirical investigation of the illusion. Through a series of four experiments, using different methods of measurement, we show that changes to the phase of the abutting-grating part of the inducing stimulus can dramatically change the perceived strength and clarity of the long-range illusory contour. The easy manipulation of illusion strength should make the offset-arcs illusion applicable to a wide range of studies that utilize long-range illusory contours. The lack of a brightness component to the illusion should allow the offset-arcs illusion to help separate perceptual grouping from surface brightness effects that are often confounded in other illusory contours. 相似文献
950.
Attentional capture by abrupt onsets can be modulated by several factors, including the complexity, or perceptual load, of a scene. We have recently demonstrated that observers are less likely to be captured by abruptly appearing, task-irrelevant stimuli when they perform a search that is high, as opposed to low, in perceptual load (Cosman & Vecera, 2009), consistent with perceptual load theory. However, recent results indicate that onset frequency can influence stimulus-driven capture, with infrequent onsets capturing attention more often than did frequent onsets. Importantly, in our previous task, an abrupt onset was present on every trial, and consequently, attentional capture might have been affected by both onset frequency and perceptual load. In the present experiment, we examined whether onset frequency influences attentional capture under conditions of high perceptual load. When onsets were presented frequently, we replicated our earlier results; attentional capture by onsets was modulated under conditions of high perceptual load. Importantly, however, when onsets were presented infrequently, we observed robust capture effects. These results conflict with a strong form of load theory and, instead, suggest that exposure to the elements of a task (e.g., abrupt onsets) combines with high perceptual load to modulate attentional capture by task-irrelevant information. 相似文献