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571.
This article compares the properties of apparent motion between a light and a touch with apparent motion between either two lights or two touches. Visual and tactile stimulators were attached to the tips of the two index fingers that were held apart at different distances. Subjects rated the quality of apparent motion between each stimulus combination for a range of stimulus onset asynchronies (SOAs). Subjects reported perceiving apparent motion between all three stimulus combinations. For light-light visual apparent motion, the preferred SOA and the direction threshold SOAs increased as the distance between the stimuli increased (consistent with Korte's third law of apparent motion). Touch-touch apparent motion also obeyed Korte's third law, but over a smaller range of distances, showing that proprioceptive information concerning the position of the fingers is integrated into the tactile motion system. The threshold and preferred SOAs for visuotactile apparent motion did not vary with distance, suggesting a different mechanism for multimodal apparent motion. 相似文献
572.
Two areas in the human occipito-temporal cortex respond preferentially to faces: 'the fusiform face area' ('FFA') and the 'occipital face area' ('OFA'). However, it is unclear whether these areas have an exclusive role in processing faces, or if sub-maximal responses in other visual areas such as the lateral occipital complex (LOC) are also involved. To clarify this issue, we tested a brain-damaged patient (PS) presenting a face-selective impairment with functional magnetic resonance imaging (fMRI). The right hemisphere lesion of the prosopagnosic patient encompasses the 'OFA' but preserves the 'FFA' and LOC. Using fMRI-adaptation, we found a larger response to different faces than repeated faces in the ventral part of the LOC both for normals and the patient, next to her right hemisphere lesion. This observation indicates that following prosopagnosia, areas that do not respond preferentially to faces such as the ventral part of the LOC (vLOC) may still be recruited to subtend residual perception of individual faces. 相似文献
573.
There is little information concerning what people think about when completing questionnaires that assess perceptions of risk, and even less for questionnaires assessing unrealistic optimism. The thoughts of 40 participants who displayed unrealistic optimism about risks of skin cancer were elicited using think aloud methods, when completing both direct and indirect ratings of unrealistic optimism. The most common thoughts overall concerned exposure to the sun, and features such as skin colouring. Thoughts concerning prevalence, reasons for risky behaviour and admissions of ignorance were more common for indirect measures of unrealistic optimism than for direct measures. The direct unrealistic optimism measures yielded more optimistic ratings for those participants who did not mention symptoms or signs of skin damage, and those who mentioned thoughts about prevalence. Participants seem to be drawing upon different sources of information when completing superficially similar direct and indirect measures of unrealistic optimism, which may explain why these measures are usually only modestly associated. People do not seem to think about numerical probabilities when estimating risk, but instead appear to focus on issues such as exposure to risk, and concrete bodily symptoms and signs. This may at least partially explain why attempts to influence behaviour by providing probabilistic information are generally unsuccessful. 相似文献
574.
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576.
Mathilde Sacher Laurence Taconnat Cline Souchay Michel Isingrini 《Consciousness and cognition》2009,18(3):754-761
This research investigated the effect of divided attention at encoding on feeling-of-knowing (FOK). Participants had to learn a 60 word-pair list under two experimental conditions, one with full attention (FA) and one with divided attention (DA). After that, they were administered episodic FOK tasks with a cued-recall phase, a FOK phase and a recognition phase. Our results showed that DA at encoding altered not only memory performance, but also FOK judgments and FOK accuracy. These findings throw some light on the central role of the quality of memory encoding to make accurate FOK judgments and provide new evidence supporting the relationship between memory and metamemory judgments. 相似文献
577.
Laurence Picard Isméry Reffuveille Francis Eustache Pascale Piolino 《Consciousness and cognition》2009,18(4):864-876
This study investigated the mechanisms behind episodic autobiographical memory (EAM) development in school-age children. Thirty children (6–11 years) performed a novel EAM test. We computed one index of episodicity via autonoetic consciousness and two indices of retrieval spontaneity (overall and EAM-specific) for a recent period (previous school year) and a more remote one (preschool years). Executive functions, and episodic and personal semantic memory were assessed. Results showed that recent autobiographical memories (AMs) were mainly episodic, unlike remote ones. An age-related increase in the indices of episodicity and specific spontaneity for recent AMs was mainly mediated by an age-related increase in the efficiency of the three cognitive abilities. Remote AMs varied only slightly with age (overall spontaneity), reflecting improvements in semantic abilities. Thus, EAM development in school-age children is essentially bound up with the increasing efficiency of cognitive abilities. Results are discussed in the light of models of childhood amnesia. 相似文献
578.
All experimental psychologists understand the importance of randomizing lists of items. However, randomization is generally
constrained, and these constraints—in particular, not allowing immediately repeated items— which are designed to eliminate
particular biases, frequently engender others. We describe a simple Monte Carlo randomization technique that solves a number
of these problems. However, in many experimental settings, we are concerned not only with the number and distribution of items
but also with the number and distribution of transitions between items. The algorithm mentioned above provides no control
over this. We therefore introduce a simple technique that uses transition tables for generating correctly randomized sequences.
We present an analytic method of producing item-pair frequency tables and item-pair transitional probability tables when immediate
repetitions are not allowed. We illustrate these difficulties and how to overcome them, with reference to a classic article
on word segmentation in infants. Finally, we provide free access to an Excel file that allows users to generate transition
tables with up to 10 different item types, as well as to generate appropriately distributed randomized sequences of any length
without immediately repeated elements. This file is freely available from http://leadserv.u-bourgogne.fr/IMG/xls/TransitionMatrix.xls. 相似文献
579.
Child-care history, classroom composition, and children's functioning in kindergarten 总被引:3,自引:0,他引:3
Previous research indicates that exposure to nonparental child care at an earlier age and for more hours predicts, at the individual level, more aggressive and disobedient behavior and greater school preparedness. The present study extended child-care research by investigating classroom-composition effects, that is, effects of the combined child-care histories of all the children in the classroom. Analyses showed that effects at the individual level aggregate at the classroom level: Kindergarten children with limited or no child-care history exhibited more externalizing behavior (e.g., fighting and arguing) and higher academic achievement when schooled in classrooms with more peers who had extensive child-care histories. 相似文献
580.
Mattys SL Melhorn JF White L 《Journal of experimental psychology. Human perception and performance》2007,33(4):960-977
Although the effect of acoustic cues on speech segmentation has been extensively investigated, the role of higher order information (e.g., syntax) has received less attention. Here, the authors examined whether syntactic expectations based on subject-verb agreement have an effect on segmentation and whether they do so despite conflicting acoustic cues. Although participants detected target words faster in phrases containing adequate acoustic cues ("spins" in take spins and "pins" in takes pins), this acoustic effect was suppressed when the phrases were appended to a plural context (those women take spins/*takes pins [with the asterisk indicating a syntactically unacceptable parse]). The syntactically congruent target ("spins") was detected faster regardless of the acoustics. However, a singular context (that woman *take spins/takes pins) had no effect on segmentation, and the results resembled those of the neutral phrases. Subsequent experiments showed that the discrepancy was due to the relative time course of syntactic expectations and acoustics cues. Taken together, the data suggest that syntactic knowledge can facilitate segmentation but that its effect is substantially attenuated if conflicting acoustic cues are encountered before full realization of the syntactic constraint. 相似文献