Do pigeons (Columba livia) perceive object unity?

Human infants perceive two rods moving in concert behind an occluder as one unitary rod. In four experiments we tested whether pigeons also perceive unity of objects. Pigeons were trained on a matching-to-sample task to discriminate between one unitary rod moving at a constant speed and two aligned rods moving together at the same speed. The latter stimulus was identical to the former except for a gap in the center. In experiment 1, we tested pigeons in probe trials in which a rectangle occluded the center of the sample rods, to see which comparison stimulus, the unitary rod or the aligned two rods, the subjects would match to the sample. Two of the three subjects pecked at the two rods significantly more often than at the unitary rod. In experiment 2, we trained the same pigeons to match the sample rods moving "in front of" the occluder. Pigeons persisted in matching two separate rods to the unitary rod moving in front of the occluder. In experiments 3 and 4, we used a parallelogram and an undulating shape as the occluder to alter the shape and the size of the portions above and below the occluder by the motion of the sample rods. Both subjects chose the two rods significantly more often than chance in experiment 3 and one of them did so in experiment 4. The results suggest that pigeons do not complete occluded portions even though the two elements move in concert. These negative results suggest that some alternative way of identifying objects may have evolved in pigeons. Accepted after revision: 2 May 2001 Electronic Publication     

Emergent social identities in a flood: Implications for community psychosocial resilience

Although the mobilization of pre‐existing networks is crucial in psychosocial resilience in disasters, shared identities can also emerge in the absence of such previous bonds, due to survivors sharing a sense of common fate. Common fate seems to operate in sudden‐impact disasters (e.g., bombings), but to our knowledge, no research has explored social identity processes in “rising‐tide” incidents. We interviewed an opportunity sample of 17 residents of York, United Kingdom, who were involved in the 2015–2016 floods. Using thematic and discourse analysis, we investigated residents' experiences of the floods and the strategic function that invocations of community identities perform. We show how shared community identities emerged (e.g., because of shared problems, shared goals, perceptions of vulnerability, and collapse of previous group boundaries) and show how they acted as a basis of social support (both given and expected). The findings serve to further develop the social identity model of collective psychosocial resilience in rising‐tide disasters. Implications for policy and practice are discussed.     

How patients’ representations of cystic fibrosis-related diabetes inform their health behaviours

Background: Although diabetes is a frequent complication of cystic fibrosis (CF), patients’ behaviours tend not to comply with best practice recommendations. Using Leventhal’s Common-Sense Model, we address this issue by exploring patients’ representations of CF-related diabetes (CFRD) to better understand the discrepancy between patients’ expected and observed health behaviours.

Methods: Semi-structured individual interviews were conducted with patients (n = 39) in six CF clinics in Quebec, Canada. These interviews were part of a larger research project on screening and management practices for CFRD.

Results: Illness representations differed between two groups of interviewed patients: (1) one group had either CF without dysglycemia or CF with impaired glucose tolerance; and (2) the other group had CFRD. Both representations were internally consistent and encompassed Leventhal’s five dimensions of illness representation: illness identity, cause, timeline, consequences and control.

Conclusions: Patients require specific information on CFRD. The screening phase could be a crucial time to help patients adjust their representations to fit the reality of CFRD.     

Assimilative and Accommodative Integration: The Basic Dialectics

Two basic styles in psychotherapy integration can be described, in which respectively the assimilative or the accommodative mode of proceeding preponderate. The first is chosen by those who wish to keep a firm grounding in any one theoretical system, into which they incorporate perspectives or practices from other schools, reinterpreted and reformulated in their own terms. The second is favored by those who prefer to practice eclectically, without worrying too much about the contradictions and incompatibilities among the different approaches. The latter therapists can remain at this purely eclectic level, or move on towards a proper integration. In this case the integration does not usually happen on the base of a preferred system, as in theoretical integration, but rather follows the line of the common factors approach. This integration mode has a prevalent accommodative character. It points to a basic structure that is common to the different methods, and becomes clearer the more the relation is freed of the constriction of theoretical models. An attempt is made to show the substantial complementarity and the dialectical relation that links the two fundamental modes of psychotherapy integration.     

Marginal maximum likelihood estimation of item response theory (IRT) equating coefficients for the common-examinee design

A method of estimating item response theory (IRT) equating coefficients by the common-examinee design with the assumption of the two-parameter logistic model is provided. The method uses the marginal maximum likelihood estimation, in which individual ability parameters in a common-examinee group are numerically integrated out. The abilities of the common examinees are assumed to follow a normal distribution but with an unknown mean and standard deviation on one of the two tests to be equated. The distribution parameters are jointly estimated with the equating coefficients. Further, the asymptotic standard errors of the estimates of the equating coefficients and the parameters for the ability distribution are given. Numerical examples are provided to show the accuracy of the method.     

The effects of programming common stimuli for enhancing stimulus generalization of academic behavior

Programming common stimuli is a strategy for generalizing behavior across settings (Stokes & Baer, 1977). The present study programmed common stimuli (i.e., goal statement and use of a pictorial icon) to generalize the effects of a reinforcement-based intervention for students identified as either developmentally delayed or emotionally disturbed. Results supported the effectiveness of the strategy in producing generalized responding from training to the generalization setting. The importance of methodological rigor in future research exploring generalization and the need to compare generalization strategies are discussed.     

Perception of the stereokinetic illusion by the common marmoset (<Emphasis Type="Italic">Callithrix jacchus</Emphasis>)

Stereokinetic illusions have never been investigated in non-human primates, nor in other mammalian species. These illusions consist in the perception of a 3D solid object when certain 2D stimuli are rotated slowly in the plane perpendicular to the line of sight. The ability to perceive the stereokinetic illusion was investigated in the common marmoset (Callithrix jacchus). Four adult marmosets were trained to discriminate between a solid cylinder and a solid cone for food reward. Once learning criterion was reached, the marmosets were tested in sets of eight probe trials in which the two solid objects used at training were replaced by two rotating 2D stimuli. Only one of these stimuli produced, at least to the human observer, the stereokinetic illusion corresponding to the solid object previously reinforced. At test, the general behaviour and the total time spent by the marmosets observing each stimulus were recorded. The subjects stayed longer near the stimulus producing the stereokinetic illusion corresponding to the solid object reinforced at training than they did near the illusion corresponding to the previously non-rewarded stimulus. Hence, the common marmosets behaved as if they could perceive stereokinetic illusions.     

共同方法偏差检验：问题与建议

检验共同方法偏差(CMB)已经成为心理学实证研究中的一个环节。本文从数学模型角度分析方法变异(CMV)的影响,并讨论了CMB常用的检验法——Harman单因子法、控制未测量的潜在方法因子(ULMC)法、验证性因子分析(CFA)标签变量法的检验力。Harman单因子法检验力很低,ULMC法检验力中等,CFA标签变量法检验力虽然较高但问题也不少。提出一个好的检验法应当满足的三个特点：符合CMV的数学模型、评价标准不受非CMV来源的影响、对CMV、CMB的变化敏感。最后给出CMB检验的建议。     

全球公共卫生治理中的“病毒主权”困境研究

在新型冠状病毒感染全球迅速蔓延的背景下,有关“病毒主权”的议题再次成为国际社会的焦点。病毒共享机制在其实践中造成了有利于西方大国而危害发展中国家的现状,从而导致了“病毒主权”困境,通过梳理病毒共享的发展与现状,着重从国家利益、现有机制和集体行动力三个方面深入分析全球公共卫生治理中的“病毒主权”困境的成因,并相应提出破除该困境的三个改革方向,以期为更好地完善全球公共卫生治理提供依据。

     

THE HISTORICAL CONNECTION BETWEEN THE GOLDEN RULE AND THE SECOND GREATEST LOVE COMMAND

The golden rule, perhaps the most recognizable moral maxim in Western culture, is an inadequate basis for morality. In light of its flaws as a precept and its apparent lack of moral content, it is initially perplexing that the historic Judeo‐Christian tradition has often linked the golden rule with the second greatest command to love one's neighbor as oneself. However, after examining the presuppositions behind this link and investigating the biblical context of these sayings, it is clear that the Judeo‐Christian tradition is justified in making this connection. Although the golden rule and the love command should not be conflated and their distinctions should not be abandoned, the biblical intention of the golden rule can only be understood and properly practiced in connection with the love command.