Sewards TV  Sewards MA 《Consciousness and cognition》2000,9(1):86-116

It has been shown that visual awareness in the blind hemifield of hemianopic cats that have undergone unilateral ablations of visual cortex can be restored by sectioning the commissure of the superior colliculus or by destroying a portion of the substantia nigra contralateral to the cortical lesion (the Sprague effect). We propose that the visual awareness that is recovered is due to synchronized oscillatory activities in the superior colliculus ipsilateral to the cortical lesion. These oscillatory activities are normally partially suppressed by the inhibitory, GABAergic contralateral nigrotectal projection, and the destruction of the substantia nigra, or the sectioning of the collicular commissure, disinhibits the collicular neurons, causing an increase in the extent of oscillatory activity and/or synchronization between activities at different sites. This increase in the oscillatory and synchronized character is sufficient for the activities to give rise to visual awareness. We argue that in rodents and lower vertebrates, normal visual awareness is partly due to synchronized oscillatory activities in the optic tectum and partly due to similar activities in visual cortex. It is only in carnivores and primates that visual awareness is wholly due to cortical activities. Based on von Baerian recapitulation theory, we propose that, even in humans, there is a period in early infancy when visual awareness is partially due to activities in the superior colliculus, but that this awareness gradually disappears as the nigrotectal projection matures.  相似文献   

  总被引：3，自引：0，他引：3  

V. Anne Tubb  James M.  Wood Harmon M.  Hosch 《Journal of applied social psychology》1999,29(6):1111-1127

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David V. Budescu  Wing Tung Au 《决策行为杂志》2002,15(1):37-63

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Richardson JV  Baron A 《Journal of the experimental analysis of behavior》2008,89(2):169-181

In three experiments, a rat's lever presses could postpone timeouts from food pellets delivered on response-independent schedules. In Experiment 1, the pellets were delivered at variable-time (VT) rates ranging from VT 0.5 to VT 8 min. Experiment 2 replicated the VT 1 min and VT 8 min conditions of Experiment 1 with new subjects. Finally, subjects in Experiment 3 could postpone timeouts from delivery of pellets that differed in quality rather than quantity (unsweetened versus sweetened pellets). In general, response rates and success in avoiding increased as a function of the rate and quality of the pellets. Also, performance efficiency increased as the experiments progressed, that is, the avoidance response occurred later and later in the response-timeout interval. The results support the conclusion that timeout from reinforcement has functional properties similar to those of more commonly studied aversive stimuli (e.g., shock).  相似文献   

    

Kimberly D. Bess  Isaac Prilleltensky  Douglas D. Perkins  Leslie V. Collins 《American journal of community psychology》2009,43(1-2):134-148

Community psychologists have long worked with community-based human service organizations to build participatory processes. These efforts largely aim at building participatory practices within the current individual-wellness paradigm of human services. To address collective wellness, human service organizations need to challenge their current paradigm, attend to the social justice needs of community, and engage community participation in a new way, and in doing so become more openly political. We use qualitative interviews, focus groups, organizational documents, and participant observation to present a comparative case study of two organizations involved in such a process through an action research project aimed at transforming the organizations’ managerial and practice paradigm from one based on first-order, ameliorative change to one that promotes second-order, transformative change via strength-based approaches, primary prevention, empowerment and participation, and focuses on changing community conditions. Four participatory tensions or dialectics are discussed: passive versus active participation, partners versus clients, surplus powerlessness versus collective efficacy, and reflection/learning versus action/doing.  相似文献   

    

Lazareva OF  Smirnova AA  Bagozkaja MS  Zorina ZA  Rayevsky VV  Wasserman EA 《Journal of the experimental analysis of behavior》2004,82(1):1-19

Eight crows were taught to discriminate overlapping pairs of visual stimuli (A+ B-, B+ C-, C+ D-, and D+ E-). For 4 birds, the stimuli were colored cards with a circle of the same color on the reverse side whose diameter decreased from A to E (ordered feedback group). These circles were made available for comparison to potentially help the crows order the stimuli along a physical dimension. For the other 4 birds, the circles corresponding to the colored cards had the same diameter (constant feedback group). In later testing, a novel choice pair (BD) was presented. Reinforcement history involving stimuli B and D was controlled so that the reinforcement/nonreinforcement ratios for the latter would be greater than for the former. If, during the BD test, the crows chose between stimuli according to these reinforcement/nonreinforcement ratios, then they should prefer D; if they chose according to the diameter of the feedback stimuli, then they should prefer B. In the ordered feedback group, the crows strongly preferred B over D; in the constant feedback group, the crows' choice did not differ significantly from chance. These results, plus simulations using associative models, suggest that the orderability of the postchoice feedback stimuli is important for crows' transitive responding.  相似文献   

    

V K Johnson 《Family process》2001,40(3):333-342

Family systems theories remind us that, in two-parent families, children encounter their parents in multiple family configurations, including parent-child dyads and mother-father-child triads, or whole families. There are, however, relatively few empirical investigations of differences in parenting behavior which tend to emerge when a dyad is transformed into a whole family unit. Using a sample of 82 families with a kindergarten-age child, the present study offers support to earlier studies reporting that mothers' and fathers' parenting behavior differs when observed in dyadic and whole family interaction sessions. The present study then turns to examining explanations for these differences in parenting behavior. Limited support was found for the hypothesis that observations of marital interaction are associated with differences in parenting behavior across family interaction contexts. Family level assessment of adaptive organization was found to explain differences in fathers' parenting in the dyad and when the entire family is together, but not differences in mothers' parenting behavior. The clinical and methodological implications of these findings are discussed.  相似文献   

    

Dupéré V  Perkins DD 《American journal of community psychology》2007,39(1-2):107-119

Research has found that neighborhood structural characteristics can influence residents' mental health. Few studies, however, have explored the proximal reasons behind such influences. This study investigates how different types of communities, in terms of environmental stressors (social and physical disorder and fear of crime) and social resources (informal ties and formal organizational participation), affect well-being, depression, and anxiety in adult residents. Data are from a survey of 412 residents nested in 50 street blocks. Block stressors and resources were cluster analyzed to identify six block types. After controlling for several individual- and block-level characteristics, results from multilevel models suggest that in communities facing relatively few stressors, higher levels of formal participation are associated with better mental health. Because high levels of formal participation were not found in communities with higher levels of stressors, the impact of participation in such contexts could not be examined. However, results suggest that in communities where stressors are more common, isolation from neighbors may have a protective effect on mental health.  相似文献   

  总被引：1，自引：0，他引：1  

Botega NJ  Silva SV  Reginato DG  Rapeli CB  Cais CF  Mauro ML  Stefanello S  Cecconi JP 《Suicide & life-threatening behavior》2007,37(2):145-153

Nursing personnel (N = 317) working at a general hospital attended a 6-hour training program on suicide prevention. They answered anonymously pre- and post-training the Suicide Behavior Attitude Questionnaire (SBAQ), which comprises 21 visual analogue scale items divided in three factorial subscales. The results indicated there were positive changes in the attitudes and these gains were significantly maintained at the 6-month follow-up evaluation. Improvement was in the Feelings and Professional Capacity subscales (ANOVA; p = 0.0001 and 0.01, respectively). There was no change on the Right to Suicide subscale. Because attitudes influence the effectiveness of health care personnel interventions, our findings may have important implications for the development of suicide prevention programs.  相似文献   

    

Ty Partridge  Jacqueline V. Lerner 《Infant and child development》2007,16(3):255-265

A purported hallmark of temperament characteristics is that they appear very early in the course of development and are persistent across time and situation. There is, however, a small, but growing cadre of research findings that question this traditional view. It may be that temperament characteristics are not necessarily established during the first few months of development or are not stable over time. A secondary analysis of the New York Longitudinal Study (NYLS) temperament data was conducted to investigate the hypothesis that temperament has a complex developmental course over the first five years of development. A latent growth curve analysis of difficult temperament suggests that temperament development follows a non‐linear trajectory. This finding, in concert with related findings, suggests the need for a broader discussion of the possible developmental processes that underlie these patterns. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献