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Subjects reported either the colors or shapes of two simultaneous masked letters. Our first study found that they were less accurate when the reported features were identical ("repetition blindness," or RB), while repetition along the unreported dimension had no effect. Three follow-up studies confirmed that when the same dimension was judged (overtly or covertly) for both stimuli, performance was only affected by repetition along that dimension. However, when different dimensions were judged for the two stimuli, performance was affected by repetition on both dimensions. These findings support new conclusions about both RB and visual attention. First, RB depends critically on visual attention, rather than simply on the stimulus presented or the overt response required. Second, while attention can be restricted to a single visual dimension, this is efficient only when the same dimension is selected for both objects. Selecting the color of one object and the shape of another simultaneous object results in both dimensions being accessed for both objects. 相似文献
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Operant conditioning of behavioral variability using a percentile reinforcement schedule. 总被引:3,自引:3,他引:0
A Machado 《Journal of the experimental analysis of behavior》1989,52(2):155-166
The present investigation developed and tested a new percentile reinforcement schedule suited to study pattern variability, whose main feature was the relative dissociation it provided between the variability requirement defining criterional responses and overall probability of reinforcement. In a discrete-trials procedure, pigeons produced patterns of four pecks on two response keys. If the pattern emitted on the current trial differed from the N preceding patterns, reinforcement was delivered with probability mu. The schedule continuously adjusted the criterion N such that the probability of a criterional response, estimated from the subject's recent behavior, was always constant. In these circumstances, the criterion corresponded to an invariant percentile in the distribution of recent responses. Using a between-subjects design, Experiment 1 manipulated the variability requirement--the percentile--while keeping overall reinforcement probability constant. The degree of variability varied directly with the requirement. In addition, an inverse relationship existed between the requirement and within-group variance. Experiment 2 manipulated probability of reinforcement while maintaining the variability requirement constant. No consistent relationship was found between variability and reinforcement probability. A tentative hypothesis was advanced ascribing the operant conditioning of behavioral variability to a process of probability-dependent selection. 相似文献
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The impact of the new wine common market organization (CMO) on behavioural loyalty towards product attributes: A case from Italy
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Armando Maria Corsi Sarah Rann Overton Leonardo Casini 《Journal of Consumer Behaviour》2014,13(4):231-241
This paper explores the changes in consumers' loyalty towards wine after the launch of the new common market organization (CMO) (European Council Regulation (EC) No. 479/2008) in 2008. The analysis of wine purchases in the AC Nielsen Consumer Panel in 2009 and 2010 was compared to analogous work conducted in 2003–2005 and 2006–2008. Loyalty towards wine attributes— price, quality designation and packaging format—was measured using standard brand performance measures together with a newer metric, the polarization index, which has not been used before to highlight or explain the factors behind shifts in loyalty. The analysis revealed that post‐CMO reform increases in consumer loyalty towards the following: (i) standard 0.75‐L wine bottles; (ii) quality‐classified, protected designation of origin wines; and (iii) higher‐price‐point wines. The paper elaborates these findings, explaining how changes in consumers' loyalty patterns can be used to quantify the success of recent policy changes, which can be tracked in a reasonably short time frame thanks to the polarization index. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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Leonardo Fernandino Lisa L. ConantJeffrey R. Binder Karen BlindauerBradley Hiner Katie SpanglerRutvik H. Desai 《Brain and language》2013
The problem of how word meaning is processed in the brain has been a topic of intense investigation in cognitive neuroscience. While considerable correlational evidence exists for the involvement of sensory-motor systems in conceptual processing, it is still unclear whether they play a causal role. We investigated this issue by comparing the performance of patients with Parkinson’s disease (PD) with that of age-matched controls when processing action and abstract verbs. To examine the effects of task demands, we used tasks in which semantic demands were either implicit (lexical decision and priming) or explicit (semantic similarity judgment). In both tasks, PD patients’ performance was selectively impaired for action verbs (relative to controls), indicating that the motor system plays a more central role in the processing of action verbs than in the processing of abstract verbs. These results argue for a causal role of sensory-motor systems in semantic processing. 相似文献
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Michela Balsamo Antonella Macchia Leonardo Carlucci Laura Picconi Marco Tommasi Paul Gilbert 《Journal of personality assessment》2015,97(1):81-89
The aims of this study were to investigate the construct validity of the Other as Shamer scale (OAS) using confirmatory factor analysis (CFA) and to examine the psychometric properties of its Italian version in a sample of 687 nonclinical individuals. The CFA results indicated that the hypothesized hierarchical model (with 1 higher order factor and 3 first-order factors) was the best fitting solution. Cronbach's alpha indexes, as well as test–retest stability, provided satisfactory results. Correlations of the OAS total score and its subscales with the Beck Depression Inventory–II (rs = .30–.48) and the Teate Depression Inventory (rs = .32–.45) were both substantial and significant (p < .01). Receiver operating characteristic curves were constructed to indicate sensitivity and specificity of the OAS and its subscales when determining those nonclinical subjects who met clinical thresholds for depression symptoms. A series of cutoff scores for the OAS scale and its subscales was developed, with sensitivity values between .70 and .62, and specificity values between .71 and .62, indicating good to fair discrimination between the 2 groups (depressed vs. nondepressed). The theoretical and practical implications of these results were discussed. 相似文献
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