Perceptual categories and boundaries arise when Ss respond to continuous variation on a physical dimension in a discontinuous fashion. It is more difficult to discriminate between members of the same category than to discriminate between members of different categories, even though the amount of physical difference between both pairs is the same. Speech stimuli have been the sole class of auditory signals to yield such perception; for example, each different consonant phoneme serves as a category label. Experiment I demonstrates that categories and boundaries occur for both speechand nonspeech stimuli differing in rise time. Experiment II shows that rise time cues categorical differences in both complex and simple nonspeech waveforms. Taken together, these results suggest that certain aspects of speech perception are intimately related to processes and mechanisms exploited in other domains. The many categories in speech may be based on categories that occur elsewhere in auditory perception. 相似文献
Reber, A. S. and Scarborough, D. L. Toward a Psychology of Reading. Hillsdale, N. J.: Lawrence Erlbaum Associates. 1977. Pp. xii + 337. £13.50. ISBN 0470 99010 4.
Medin, D. L., Roberts, W. A. and Davis, R. T. Process of Animal Memory. Hillsdale, New Jersey: Lawrence Erlbaum Associates. 1976. Pp. 267. £ 11.50. ISBN 0 470 15189 7.
Myers, R. D. (Ed.). Methods in Psychobiology, Vol. III. New york: Academic Press. 1977. Pp. 339. £14.20. ISBN 0 12 4610 03 X.
Estes, W. K. (Ed.). Handbook of Learning and Cognitive Processes, Volume 2. Conditioning and Behavior Theory. Hillsdale, New Jersey: Lawrence Erlbaum Associates. 1975. Pp. 373. ISBN 0 470 24586 7. 相似文献
Objective: Conduct a randomized treatment trial to test whether healthy dieting maintains bulimic symptoms or effectively reduces this eating disturbance.
Methods: Female participants (n=85) with full- and sub-threshold bulimia nervosa were randomly assigned to a 6-session healthy dieting intervention or waitlist condition and assessed through 3-month follow-up.
Results: Relative to control participants, intervention participants showed modest weight loss during treatment and demonstrated significant improvements in bulimic symptoms that persisted through follow-up.
Discussion: These preliminary results suggest that this intervention shows potential for the treatment of bulimia nervosa and may be worthy of future refinement and evaluation. Results also provide experimental evidence that dieting behaviors do not maintain bulimia nervosa, suggesting the need to reconsider maintenance models for this eating disorder. 相似文献
Self-determination theory research has demonstrated that intrinsic and identified self-regulations are associated with successful adaptation. However, few distinctions are typically made between these regulations and their outcomes. In the present studies, the associations between intrinsic and identified motivations and outcomes of psychological well-being and academic performance are compared in educational settings. In Study 1, intrinsic self-regulation predicted psychological well-being, independent of academic performance. In contrast, identified regulation predicted academic performance. Additionally, the more that students demonstrated an identified academic regulation, the more that their psychological well-being was contingent on performance. In Study 2a, priming intrinsic self-regulation led to greater psychological well-being 10 days later. In Study 2b, an implicit measure of identified regulation predicted academic performance 6 weeks later. Results indicate the need to address important distinctions between intrinsic and identified regulations. 相似文献
We present three experiments in which subjects were asked to make speeded sex judgements (Experiment 1) or semantic judgements (Experiments 2 and 3) to face targets and nonface items, while ignoring a solitary flanking distractor face or a nonface stimulus. Distractors could be either congruent (same response category) or incongruent (different response category) with the target. Distractor congruency effects were consistently observed in all combinations of target-distractor stimulus pairs, except when a distractor face flanked a target face. The failure to find congruency effects in this condition was explored further in a fourth experiment, in which four task-irrelevant flankers were simultaneously presented. Once again, no face-face congruency effects were found, even though comparison distractors interfered with face and nonface targets alike. However, four simultaneously presented distractor faces did not interfere with nonface targets either. We suggest that these experiments demonstrate a capacity limit for visual processing in these conditions, such that no more than one face is processed at a time. 相似文献
"Family time" is reflected in the process of building and fortifying family relationships. Whereas such time, free of obligatory work, school, and family maintenance activities, is purchased by many families using discretionary income, we explore how low-income mothers make time for and give meaning to focused engagement and relationship development with their children within time constraints idiosyncratic to being poor and relying on welfare. Longitudinal ethnographic data from 61 low-income African American, European American, and Latina American mothers were analyzed to understand how mothers construct family time during daily activities such as talking, play, and meals. We also identify unique cultural factors that shape family time for low-income families, such as changing temporal orientations, centrality of television time, and emotional burdens due to poverty. Implications for family therapy are also discussed. 相似文献
We are able to recognise familiar faces easily across large variations in image quality, though our ability to match unfamiliar faces is strikingly poor. Here we ask how the representation of a face changes as we become familiar with it. We use a simple image-averaging technique to derive abstract representations of known faces. Using Principal Components Analysis, we show that computational systems based on these averages consistently outperform systems based on collections of instances. Furthermore, the quality of the average improves as more images are used to derive it. These simulations are carried out with famous faces, over which we had no control of superficial image characteristics. We then present data from three experiments demonstrating that image averaging can also improve recognition by human observers. Finally, we describe how PCA on image averages appears to preserve identity-specific face information, while eliminating non-diagnostic pictorial information. We therefore suggest that this is a good candidate for a robust face representation. 相似文献
Compassion is central to the aim of improving patient care and staff well-being within healthcare systems. To inform service development, explorations of experiences and meanings of compassion are needed. This study explored cognitive behavioural therapists ' understandings of compassion within their work environment.
Design
A qualitative study was conducted using semistructured interviews and interpretative phenomenological analysis (IPA).
Methods
Data were obtained from five practicing cognitive behavioural therapists.
Results
Two superordinate themes were developed, each with two subordinate themes. CBT therapists reported entering the profession with intrinsic motivation to care for others. They further developed an interest in compassion with exposure to clients and ongoing professional development in compassion-focused therapy (CFT). Compassionate work environments helped to facilitate compassionate practice; however, for many, workplaces were perceived to lack compassion. Challenges were encountered when negative workplace interactions left therapists feeling fatigued, distressed and demoralised. There was a desire for recognition and to be seen as more than a “work machine,” the experience of which was a threat to retaining therapists within the profession.
Conclusions
Current recruitment and training processes are producing staff with skills and motivation to deliver compassionate care. However, lack of compassion within workplaces can be a barrier to actioning these skills and motivations. Research needs to focus on how to effectively implement and run systems that are compassionate for both staff and clients. To provide compassionate care, staff need work environments that show compassion to them. These findings provide some insights into and practical suggestions regarding how this can be achieved. 相似文献
This study quantified human short-term-memory decay functions for delayed vibrotactile frequency discriminations. Subjects indicated which of two successive intervals contained the higher or lower frequency of a pair separated by delay periods of 0.5–30 sec. Performance decreased as a function of length of delay and was higher when delays were unfilled than when they were filled with a backwardscounting task. This interpolated task may have interfered with rehearsal of a coded representation of the remembered vibrotactile frequency. A change in decay rate after 5-sec delays suggests a switch from reliance on sensory memory to the coded frequency representation. Performance and decay rate depended on presentation order of higher or lower frequency within pairs. Reciprocal performance asymmetries seen in high- versus low-frequency ranges did not result from simple response bias. 相似文献
A sample of 147 female and 183 male year nine pupils, between the ages of 14 and 15 years, was invited to describe an event in their lives through which they thought that they had matured or grown. The girls were twice as likely as the boys to mention an event involving smoking. The boys were twice as likely as the girls to mention an event involving drinking. These findings confirm the different significance ascribed to both alcohol and tobacco by adolescent males and females as a landmark or milestone in the process of maturation. The implications of these findings for health education are discussed. 相似文献