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61.
Empirical forced-choice psychometric functions often depart in shape from those based on the theory of normal sensory-excitation distributions and optimal decision processes. The typical departure is that the detectability of small signals is too low compared to that of high signals. Some possible explanations were reviewed and it was emphasized that the source of the effect is not known with certainty. An extra parameter resembling a threshold was introduced for the measurement of the effect, and a method of moments was proposed for estimating the two parameters of the resulting two-alternative forced-choice psychometric function. The method was tried out with success in the task of detecting a 0.1-sec luminance increment to a steady adapting luminance of a large visual target. There were large amounts of low-signal suppression, indicating the advisability of reviewing some current psychophysical practices. 相似文献
62.
This study assessed the effects of variations in signal rise-decay time on response latencies to the onset and cessation of a 1,000-Hz tone. Onset and offset reactions were combined factorially with five rates of signal rise-decay (0.5, 5, 25, 100, and 250 msec) to produce a total of 10 experimental conditions. Offset RTs were significantly longer than onset RTs when the rise-decay time of the tone was 250 msec. Disparities in speed of reaction to tone onset and cessation were negligible at the remaining rates of signal rise-decay. 相似文献
63.
It is proved that a system of linear equations over an arbitrary field has a solution if every finite subsystem has a solution provided that the set of variables can be well ordered.Presented by J. Zygmunt 相似文献
64.
James G. Emerson Jr. 《Pastoral Psychology》1968,19(10):33-36
Conclusion As I look back over three years of following a much-loved minister, a myth seems shattered. It is the myth that one should never follow a man who died in the pulpit. The issue is far more profound. The issue is whether or not the new man has the inner freedom to recognize his own feelings, see the feelings of others, and then act on both. Some may say, But what if a power group tries to run the church? The problem then is the power group, not the loss of a loved figure as such. A power group may play on the death of a saint, but the death is not the issue.When both pastor and people find that they can live with their own feelings and need not feel guilty for having them, then something new can be built. Decisions can be made about problems and programs and people, because the context for making such decisions has been realized. 相似文献
65.
66.
Carol S. Emerson David W. Harrison 《Journal of psychopathology and behavioral assessment》1990,12(4):271-283
The relationship between behavioral and physiological reactivity and cardiovascular disease has been extensively researched in men, indicating that the expression of anger may be a contributory factor in the development of coronary heart disease. Few studies, however, have focused on women. Among these, women generally have been found to be less reactive to laboratory tasks than men. In the present study, 45 women aged 19–21 years were selected to represent three groups—(1) low anger/low denial, (2) high anger/low denial, and (3) low anger/high denial—based on their scores on the State-Trait Anger Expression Inventory and the Marlowe-Crowne Social Desirability Scale. Subjects received three conditions: (1) no feedback, (2) error feedback without observer present, and (3) error feedback with observer present. As hypothesized, women who reported a high level of denial and low anger exhibited elevated stress-related reactivity. The results are suggestive of a subgroup of highly reactive women not previously identified within the literature. The hypothesis that all groups would display greater reactivity in a condition providing error feedback with observation was not supported.This study was supported by a research grant to Carol S. Emerson from the Women's Research Institute of Virginia. 相似文献
67.
Semantic activation of noun concepts in context 总被引:1,自引:0,他引:1
P Whitney T McKay G Kellas W A Emerson 《Journal of experimental psychology. Learning, memory, and cognition》1985,11(1):126-135
A modified Stoop procedure was used to examine the role that context plays in guiding semantic access of unambiguous nouns in sentence contexts. The sentences either emphasized a high- or a low-dominant property of a noun that was the last word in the sentence or were control sentences. Each sentence was followed by the relevant high- or low-dominant property either immediately or after a 300-or 600-ms delay. There was significant color-naming interference (relative to control) for high-dominant properties regardless of biasing context in the immediate and delayed conditions. There was also significant color-naming interference for low-dominant properties in the immediate condition regardless of context. However, in the delayed conditions, the low-dominant properties led to color-naming interference only when preceded by sentence contexts biasing interpretation toward the low-dominant property. It was concluded that high-dominant properties function as core, or invariant, aspects of meaning and that initial semantic access is context independent. 相似文献
68.
Human children possess the ability to approximate numerical quantity nonverbally from a young age. Over the course of early childhood, children develop increasingly precise representations of numerical values, including a symbolic number system that allows them to conceive of numerical information as Arabic numerals or number words. Functional brain imaging studies of adults report that activity in bilateral regions of the intraparietal sulcus (IPS) represents a key neural correlate of numerical cognition. Developmental neuroimaging studies indicate that the right IPS develops its number‐related neural response profile more rapidly than the left IPS during early childhood. One prediction that can be derived from previous findings is that there is longitudinal continuity in the number‐related neural responses of the right IPS over development while the development of the left IPS depends on the acquisition of numerical skills. We tested this hypothesis using fMRI in a longitudinal design with children ages 4 to 9. We found that neural responses in the right IPS are correlated over a 1–2‐year period in young children whereas left IPS responses change systematically as a function of children's numerical discrimination acuity. The data are consistent with the hypothesis that functional properties of the right IPS in numerical processing are stable over early childhood whereas the functions of the left IPS are dynamically modulated by the development of numerical skills. 相似文献
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70.
African American girls in psychiatric care are at increased risk for HIV and sexually transmitted infection (STI) through sexual risk taking. Adolescent sexual behavior often reflects peer norms and behavior. Secure attachment patterns with mothers and peers might lessen the effects of negative peer influences and reduce sexual risk taking among African American girls. This study examined the relationships among mother-daughter and peer attachment, peer norms, and sexual-risk behaviors in African American girls seeking outpatient psychiatric care. A group of 12-16-year-old African American girls (N = 262; M age = 14.45 years) reported on their attachment to their mothers and peers, peer risk-taking and dating behaviors, peer pressure, and sexual-risk behaviors (e.g., number of partners, high-risk partners, and condom use). Structural equation modeling examined whether peer attachment and peer norms mediated the relationship between mother attachment and sexual risk. Findings supported peer norms, but not peer attachment, as a mediator of mother attachment and girls' sexual-risk behaviors. Findings revealed important family and peer factors for African American girls in psychiatric care. HIV prevention programs may be strengthened by improving mother-daughter relationships, addressing the importance of peer relationships, and emphasizing how secure mother-daughter relationships can temper the impact of peer norms. 相似文献