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111.
Alfred B. Kristofferson Lorraine G. Allan Fiona A. Campbell 《Attention, perception & psychophysics》1981,30(4):362-371
A stepwise change in the frequency of a continuous pure tone is taken as an element signal. The detectability of a single step is compared with the detectability of a pattern composed of two such steps in order to determine the ways in which the steps interact and how these interactions depend upon the time interval between the steps. It is shown that two positive steps separated by D msec interact by summation (d’ for two steps being greater than d’ for a single step) and that this summation is 100% even when D=100 msec. The extent of summation decreases as D is increased beyond 100 msec, leveling off at about 40% when D is near 1,000 msec. A positive step followed by a negative step (an increment) presents a more complex picture. When D=0 msec, the pattern is the null signal, and, of course, the two steps subtract completely. As D is increased, the extent of subtraction decreases, becoming zero when D is about 400 msec. Increasing D beyond 400 msec results in summation, reaching about 40% when D=2,000 msec. For D less than about 1,000 msec, the sign of the second step in a two-step signal is important: two steps of like sign summate, and two steps of unlike sign subtract. However, when the two steps are separated by about 2,000 msec, the sign of the second step is irrelevant: summation occurs, and the extent, about 40%, is the same for two steps of like sign and two steps of unlike sign. A brief theoretical discussion stresses the extant need for an information-processing theory of signal detection. 相似文献
112.
113.
The concept of guardianship, its associated principles, distinctions, and articulation of the legal needs of the elderly are introduced via a review of well-canvassed criticisms of Canadian guardianship legislation. Claims that the reformed legislation of Alberta, Quebec, and British Columbia represent models of adequate adult guardianship compared with traditional (archaic lunacy) law are examined. This paper argues that these renovated models exhibit a dubious normative advance over traditional legislation. Specifically, the normative presuppositions of the reformed legislation, such as, restriction to an autonomy-paternalism framework, and the norms of the liberal individual and state, obscure important issues in at least two key areas which challenge the models' assumptions; namely, assessment and legal competence and assessment and need. The development of guardianship laws and of social arrangements that are more responsive to the life experiences of the elderly requires critical re-articulation of the nature of individuals and their communities. 相似文献
114.
Lorraine G. Allan 《Attention, perception & psychophysics》1975,18(1):29-36
The purpose of the present set of experiments was to determine the nature of the relationship between judgments of successiveness and judgments of order. The relationship was examined in terms of models which assume that the perception of successiveness is sufficient for the perception of correct temporal order. It was demonstrated that successiveness and order judgments cannot be jointly explained by perceptual latency models which assume that both judgments are based on the same internal event. This is the case regardless of the form of the perceptual latency distribution, and for either a threshold or a nonthreshold decision process. On the other hand, performance on a successiveness discrimination task, an order discrimination task, and a task requiring both a successiveness and an order judgment on each trial is consistent with the predictions of the attention-switching model. 相似文献
115.
Subjects could receive assistance on a difficult logic problem either by requesting help or by accepting an offer of aid from a helper. Normativeness of help seeking and presence of an incentive for correct completion of the task were also varied. Results of the study indicated that more help was obtained in the offer condition and that subjects liked the helper more when help was offered than when it was requested. The normativeness and incentive variables did not produce the expected effects. Negative consequences of requesting help were interpreted in terms of attribution theory, and the implications of these findings for help-delivery systems were discussed. 相似文献
116.
117.
The study of neuropsychological disorders has been greatly facilitated by the localization of brain lesions on MRI scans. Current popular approaches for the assessment of MRI brain scans mostly depend on the successful segmentation of the brain into grey and white matter. These methods cannot be used effectively with large lesions because lesions usually impair segmentation. We propose a novel, fully automated approach for the delineation of brain lesions on MR scans. This method involves comparing a skull stripped, smoothed, unsegmented T1 images to a control group using the general linear model. We tested this method by using images with simulated lesions of different sizes and images containing real lesions from patients with language deficits. We also tested how varying the size of the Gaussian smoothing kernel affects detection. The simulation was informed by findings of a lesion morphological study also presented here. The proposed method detected simulated lesions effectively in the range of 30--90%相似文献
118.
Damian MF Als LC 《Journal of experimental psychology. Learning, memory, and cognition》2005,31(6):1372-1384
A number of recent studies have found that objects are named more slowly in the context of same-category items than in the context of items from various semantic categories. Several experiments reported here indicated that this semantic effect is relatively persistent because it was essentially unaffected by the presence of interspersed filler items. The authors suggest that the effect is specific to the retrieval of lexical-semantic codes and characterize mechanisms that could support the effect at this processing level, such as incremental learning in the links between conceptual and lexical codes and the temporary increase of lexical resting levels. The results underscore the necessity of incorporating mechanisms of long-term adaptation into current models of spoken production. 相似文献
119.
Davé S Nazareth I Sherr L Senior R 《The British journal of developmental psychology》2005,23(4):609-621
Maternal depression is associated with adverse child development, but little is known about the effects of paternal depression. This pilot study estimated the prevalence of paternal depression and mood state, and assessed the relationship between paternal mood and infant temperament. The participants in the study were 98 fathers of newborn babies. Fathers were initially screened for depressed mood (Hospital anxiety and depression scale, and Edinburgh postnatal depression scale), and at 6 months parental mood, infant temperament, couple relationship quality, alcohol use, adverse life events, parenting, and demographics were recorded. Infant fussiness was analysed in relation to paternal mood and other contextual factors using multiple regression. Of the 98 fathers, 48 (49%) completed depression-screening measures. Of these 48 fathers, 4 (8%) reported depressive symptoms above the cut-off for case definition. A total of 48% (N=19) completed measures at follow-up. In the adjusted model, higher paternal depression scores, more traditional attitudes towards fathering, and increased recent life events were related to higher infant fussiness scores; and better couple relationship quality was related to lower fussiness scores. This study showed that 1 in 12 fathers had depressed mood, and lower mood was associated with negative infant temperament. Since the findings of this feasibility study were based on a small sample size the association of paternal mood and child development merits further study using a larger sample of fathers. 相似文献
120.
Sasha Loyal Nicky Hudson Lorraine Culley Christina Weis 《Counselling and Psychotherapy Research》2023,23(3):702-708