Violations of stochastic transitivity on concurrent chains: Implications for theories of choice

The concurrent-chains procedure has been used to measure how choice depends on various aspects of reinforcement, such as its delay and its magnitude. Navarick and Fantino (1972, 1974, 1975) have found that choice in this procedure can violate the condition of stochastic transitivity that is required if a unidimensional scale for reinforcements is to be possible. It is shown in this paper that two simple unidimensional models of choice on concurrent chains can produce violations of stochastic transitivity. It is argued that such violations may result from the complex contingencies of the concurrent-chains procedure.     

The effects of instructions, incentive, and feedback on a community problem: dormitory noise

A reinforcement system utilizing instructions, modelling, feedback, and group reinforcement was employed in an attempt to reduce disruptive noise on three university residence halls. A fourth hall received the same treatment program without the reinforcement component. Noise scores were determined by recording the number of discrete noise occurrences over a criterion decibel level. On all four residential floors, noise scores during treatment conditions were lower than initial and final baseline levels. Additionally, periods of noise reduction corresponded to the changing criterion multiple-baseline and reversal designs utilized. Pre- and posttreatment questionnaire responses from the three reinforcement floors paralleled changes in objective noise data. At posttreatment, residents reported less noise disturbance of study and sleep and more control over the noise situation and floor problems in general. These results indicated that a comprehensive behavior-modification treatment package was effective in reducing disruptive noise in university residence halls. Difficulties in data collection and anomalies in the data are discussed. Future directions for field-based behavior-modification research are outlined.     

Including Both Voices: A New Bidirectional Framework for Understanding and Improving Intergroup Relations

Methods: If successful intergroup harmony is to be achieved between two groups, then both groups' voices must be heard. Despite this, 60 years of social psychological “intergroup” prejudice research has tended to adopt a solely majority‐centric perspective, with the majority group portrayed as the active agent of prejudice, and the minority group as passive targets. Objective: This paper critically reviews relevant literature, highlighting this unidirectional imbalance, and proposes a new, two‐stage bidirectional framework, where we encourage researchers and educators to first understand how minority and majority groups' intergroup attitudes and emotions impact intergroup dynamics, before tailoring and implementing contact and recategorisation strategies to improve intergroup relations, nationally and internationally. Conclusion: We argue that the interactive nature of the intergroup dynamic needs to be better understood, and each group's voice heard, before prejudice can be effectively reduced. Lastly, we describe an Australian study, the Dual Identity and Electronic‐contact (DIEC) programme, that has been conducted and has successfully applied this bidirectional framework.     

关于交锁髓内钉应用中几个问题的思考

尽管交锁髓内钉在骨折的治疗中应用广泛,它还是在对普通髓内钉"扬弃"之后发展而来的。虽然闭合复位与开放复位、扩髓与非扩髓及静力性固定与动力性固定各自之间存在着矛盾,但是只要具体问题具体分析,作为新事物,交锁髓内钉具有强大的生命力。     

他汀类降低心血管危险作用模式的探讨

大量临床实验结果及流行病学资料已证实3-羟基3-甲基戊二酰辅酶A（HMG-CoA）还原酶抑制剂（简称他汀类）,在冠心病防治中能显著降低心血管危险。但他汀类是通过何种模式产生这一作用,至今仍未得出定论。四种模式可用来描述他汀类降低心血管危险可能的作用机制。通过对这四种模式的探讨,能使我们对他汀类的作用机理有更为全面的认识,也为临床工作者进一步研究及确定他汀类降低心血管危险的作用模式奠定基础。     

Cognition and hearing aids

The perceptual information transmitted from a damaged cochlea to the brain is more poorly specified than information from an intact cochlea and requires more processing in working memory before language content can be decoded. In addition to making sounds audible, current hearing aids include several technologies that are intended to facilitate language understanding for persons with hearing impairment in challenging listening situations. These include directional microphones, noise reduction, and fast-acting amplitude compression systems. However, the processed signal itself may challenge listening to the extent that with specific types of technology, and in certain listening situations, individual differences in cognitive processing resources may determine listening success. Here, current and developing digital hearing aid signal processing schemes are reviewed in the light of individual working memory (WM) differences. It is argued that signal processing designed to improve speech understanding may have both positive and negative consequences, and that these may depend on individual WM capacity.     

Counting distinctions: on the conceptual foundations of Shannon’s information theory

Categorical logic has shown that modern logic is essentially the logic of subsets (or “subobjects”). In “subset logic,” predicates are modeled as subsets of a universe and a predicate applies to an individual if the individual is in the subset. Partitions are dual to subsets so there is a dual logic of partitions where a “distinction” [an ordered pair of distinct elements (u, u′) from the universe U] is dual to an “element”. A predicate modeled by a partition π on U would apply to a distinction if the pair of elements was distinguished by the partition π, i.e., if u and u′ were in different blocks of π. Subset logic leads to finite probability theory by taking the (Laplacian) probability as the normalized size of each subset-event of a finite universe. The analogous step in the logic of partitions is to assign to a partition the number of distinctions made by a partition normalized by the total number of ordered |U|² pairs from the finite universe. That yields a notion of “logical entropy” for partitions and a “logical information theory.” The logical theory directly counts the (normalized) number of distinctions in a partition while Shannon’s theory gives the average number of binary partitions needed to make those same distinctions. Thus the logical theory is seen as providing a conceptual underpinning for Shannon’s theory based on the logical notion of “distinctions.” This paper is dedicated to the memory of Gian-Carlo Rota—mathematician, philosopher, mentor, and friend.     

Peer pressure against prejudice: A high school field experiment examining social network change

Individuals often conform to the intergroup attitudes and behaviors modeled by their peers in a given situation. To what extent does peer influence on intergroup prejudice 1) diffuse across a social network of peers and 2) affect attitudes and behavior across time? Student leaders (“Peer Trainers”) were trained to confront expressions of intergroup prejudice in five randomly assigned high schools across a period of five months; students recruited to be Peer Trainers in five control schools waited to be trained. Independent surveys of Peer Trainers' social networks reveal that treatment Peer Trainers were significantly more likely than control Trainers to be nominated by peers as students who confront prejudice. Treatment Peer Trainers' tolerant behavior spread to close friends and to acquaintances in their social network; their attitudes spread inconsistently, and only to close friends. Studying peer influence within social networks can improve understanding of social influence, prejudice reduction, and social change.     

Riddles in serial murder: A synthesis

This article blends the conclusions of four former law enforcement personnel who have investigated and apprehended serial killers, with pertinent principles derived primarily from the field of psychoanalysis. The four—John Douglas, Roy Hazelwood, Robert Keppel, and Robert Ressler—have written extensively about their investigations of serial killers. In their writings, they have answered many questions about the personality development of serial killers while leaving other questions only partially answered. This article expands the answers to three fundamental questions: What is the origin of the dynamics of serial killing? Why is the aggressive drive so singularly powerful and persistent in serial killers? Why is it that serial killers often reveal their identities to the police? In answering these three riddles, the contributions of four emotional pillars in the personality of killers are emphasized. The pillars include emotional hunger, anxiety and aggression, eroticism, and conscience structure. At times, these pillars merge and drive murderous behavior but the pillars lack the integration needed for healthy personality development. This synthesis offers a fuller understanding of the psychodynamics involved in serial killings.