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451.
452.
G R Loftus J Duncan P Gehrig 《Journal of experimental psychology. Human perception and performance》1992,18(2):530-49; discussion 550-61
A briefly presented visual stimulus engenders an available-information function that lags behind the physical stimulus. We report two experiments that focus on the iconic-decay portion of this function, which falls to 0 over a 200-300 ms period following stimulus offset. In each experiment, to-be-reported digit strings were shown for varying durations followed by a noise mask at varying poststimulus intervals. We found the shape of the performance curve relating digit-report probability to stimulus exposure duration to be independent of stimulus-mask interstimulus interval. This finding is consistent with the proposition that the iconic-decay function's shape is independent of stimulus duration and allows us to identify this shape. We rejected exponential iconic decay for 6 of 8 observers; however, all observers' decay functions could be adequately fit by gamma decay, a generalization of exponential decay. 相似文献
453.
The temporal nature of the associations between client-rated therapist empathy and acceptance, and both client-and therapist-assessed therapeutic progress at sessions 2 and 6 were examined pairwise with cross-lagged panel correlatation (CLPC) and linear structural relationships (LISREL) analyses in 37 clients treated in weekly individual sessions of long-term psycoanalytic and person-centred therapy by 37 experienced therapists. Although none of the cross-lagged differences in the three CLPC analyses which met the necessary conditions for interpretation were significant, two of them approached it, suggesting that session 2 client-rated progress was a stronger determinant of session 6 therapist empathy and acceptance than vice versa. However, the LISREL analyses indicated that while session 2 client-rated progress was unrelated to session 6 therapist acceptance, session 2 therapist empathy was negatively correlated with session 6 client-rated progress. furthermore, both session 2 therapist empathy and acceptance were positively associated with session 6 therapist-rated progress, thereby providing some support for the therapeutic role of these two therapist variables as postulated by person-centred theory. 相似文献
454.
Ralph J. Roberts Duncan Brown Scott Wiebke Marshall M. Haith 《Behavior research methods》1991,23(4):493-504
In this paper, we describe a computer-based laboratory for collecting and analyzing real-time performance and eye-movement data by using video game-like tasks. These tasks assess skills that require the integration of varying numbers of perception and action components. Customized hardware and software are described for configuring tasks, collecting data, reconstructing performance, and organizing, editing, and reducing data. General design considerations are emphasized for solving several of the problems encountered in constructing a real-time data collection system. The paper concludes with examples of data that illustrate the system’s usefulness for studying complex perception-action skills. 相似文献
455.
Rolf G. Jacob Sheila R. Woody Duncan B. Clark Scott O. Lilienfeld Barry E. Hirsch Gail D. Kucera Joseph M. Furman John D. Durrant 《Journal of psychopathology and behavioral assessment》1993,15(4):299-324
Space and motion discomfort (SMD) refers to the situational specificity of symptoms occurring in some patients with vestibular dysfunction, such as those with balance disorders and some with panic disorder. SMD occurs in situations characterized by inadequate visual or kinesthetic information for normal spatial orientation. We report the results of two studies of the construct validity of the Situational Characteristics Questionnaire (SitQ), which has two subscales, both of which measure SMD: the SMD-I and SMD-II. In Study 1, the SitQ was administered to members of a self-help group for balance disorders, a psychiatric sample consisting of patients with panic disorder, nonpanic anxiety disorders, depression, and a sample of normals. SMD levels were the highest in the self-help balance group, next to the highest in the panic groups, and lowest in the remaining groups. In Study 2, the SitQ was administered to otolaryngological patients with vestibular dysfunction and to patients with hearing loss. SMD levels were higher in the vestibular patients. Data on internal consistency, test-retest reliability, and convergent and discriminant validity are presented. The SitQ, particularly the SMD-II, is recommended for quantifying space and motion discomfort in patients with anxiety and/or balance disorders.Study 1 was funded by MH 40757. Study 2 was funded by a grant from the Upjohn Company and MH 19816. 相似文献
456.
John Duncan 《Attention, perception & psychophysics》1993,54(4):425-430
Accuracy is of ten reduced when two visual discriminations must be made concurrently (“divided attention”). According to a hypothesis originally proposed by Treisman (1969) and Aliport (1971), this result should depend on the similarity of required discriminations. When discriminations concern different visual dimensions, they should be made in somewhat separate visual subsystems, reducing interference between them. This prediction was tested in two experiments, involving discriminations of shape, size, orientation, and spatial frequency. In differentconditions of divided attention, concurrent discriminations concerned either the same or different dimensions, and either one or two objects. The results showed that performance depends only on the number of relevant objects, not on the number or similarity of required discriminations. They suggest that selective attention to an object is a coordinated state in which the outputs of multiple visual subsystems are made concurrently available for control of behavior. 相似文献
457.
Terry E. Duncan Edward Mauley Mike Stoolmiller Susan C. Duncan 《Journal of applied social psychology》1993,23(18):1498-1522
The present study investigated the role of social support provisions and efficacy cognitions in adherence to a prescribed exercise regimen. A generalized estimating equations approach was employed to estimate regression coefficients via an iterative weighted least squares algorithm. Findings indicated that when employed as time-varying covariates, the social provisions of reassurance of worth, attachment, and, to a lesser extent, guidance were significantly associated with intraindividual fluctuations in program adherence. Specifically, individuals with a greater sense of self-worth were more likely to adhere throughout the program, whereas the effects of subject's perceptions of greater attachment, although generally related to sustained adherence, fluctuated over time. Findings also suggest that individuals perceiving higher levels of guidance were less likely to adhere during the early and concluding stages of the exercise program. Although synchronous covariation existed between efficacy cognitions and attendance, self-efficacy was not predictive of intraindividual change in attendance over time. Results are discussed in regard to the importance of self-referent processes and social provisions in exercise adherence, and the utility of the proposed generalized estimating equations approach to the analysis of longitudinal data. 相似文献
458.
Paul Sparks Duncan Hedderley Richard Shepherd 《European journal of social psychology》1991,21(3):261-271
Concern has been expressed in the literature regarding the method of scoring ‘beliefs’ within expectancy-value models of attitudes. This paper reviews the major issues and focuses upon some hitherto largely neglected problems with scoring methods. Empirical findings from a series of studies concerned with ‘the theory of reasoned action’ are examined: with a multiplicative Combination of beliefs and evaluations, it is found that bipolar scoring of belief items leads to higher correlations of the summed products of beliefs and evaluations with attitudes than are achieved with unipolar scoring. These findings contrast markedly with recently reported research and indicate the important role played by contextual factors (such as belief content and the response scales presented to subjects). It is concluded that more attention needs to be paid to the relationship between conceptual and methodological issues. 相似文献
459.
A conceptual framework is outlined for describing the child's convention-based interaction with others. Conventions generate a set of strong sequential regularities in participants' actions while providing for meaningful variability. The framework is intended to differentiate some major components of convention-based interaction, and to indicate the manner in which these components are related to each other and to the whole. This framework is then applied to the examination of a significant aspect of the child's interaction with others: conflict. The complex relationship between convention and conflict is considered. 相似文献
460.
Dennis V. Ary Terry E. Duncan Anthony Biglan Carol W. Metzler John W. Noell Keith Smolkowski 《Journal of abnormal child psychology》1999,27(2):141-150
The developmental model of adolescent antisocial behavior advanced by Patterson and colleagues (e.g., Patterson, Reid, & Dishion, 1992) appears to generalize the development of a diverse set of problem behaviors. Structural equation modeling methods were applied to 18-month longitudinal data from 523 adolescents. The problem behavior construct included substance use, antisocial behavior, academic failure, and risky sexual behavior. Families with high levels of conflict were less likely to have high levels of parent–child involvement. Such family conditions resulted in less adequate parental monitoring of adolescent behavior, making associations with deviant peers more likely. Poor parental monitoring and associations with deviant peers were strong predictors of engagement in problem behavior. These constructs accounted for 46% of the variance in problem behavior. Although association with deviant peers was the most proximal social influence on problem behavior, parental monitoring and family factors (conflict and involvement) were key parenting practices that influenced this developmental process. 相似文献