On some ascending chains of brouwerian modal logics

This paper specifies classes of framesmaximally omnitemporally characteristic for Thomas' normal modal logicT ₂ ⁺ and for each logic in the ascending chain of Segerberg logics investigated by Segerberg and Hughes and Cresswell. It is shown that distinct a,scending chains of generalized Segerberg logics can be constructed from eachT _n ⁺ logic (n 2). The set containing allT _n ⁺ and Segerberg logics can be totally- (linearly-) ordered but not well-ordered by the inclusion relation. The order type of this ordered set is ^*( + 1). Throughout the paper my approach is fundamentally semantical.I should like to thank Professor G. E. Hughes for helpful comments on an earlier draft of this paper.     

Studies involving fathers: Subject refusal, attrition and sampling bias

The reported rates of subject refusal and attrition are reviewed in those studies where data were collected directly from fathers. Only 34 per cent of such studies report on subject refusal rates and 36 per cent on attrition rates. Few studies comment on or give information that would allow an assessment to be made of sampling bias arising from subject refusal and attrition. Nevertheless, studies reporting subject refusal and attrition suggest that fathers are no more difficult to recruit than mothers and that a variety of factors, individually and in combination, may have some impact on recruitment. These include the type of commitment required, the techniques of recruitment used and whether studies are hospital, home or laboratory based. However, if biases due to subject refusal and attrition are to be identified and avoided, studies need to be more open in providing information about the characteristics of refusing and participating subjects. To encourage this, some new data are presented, suggesting a number of trends: (1) extended personal contacts with potential subjects may minimize subject refusal and attrition; (2) attrition may be somewhat higher in middle-class families and families with sons.     

A model of romantic jealousy

A definition of romantic jealousy is offered and imbedded within a general coping framework. Published and unpublished research is reviewed and then ordered within this framework. It is suggested that viewing jealousy as a thing like an emotion (anger), a behavior (competitive rivalry), or thoughts (desires for exclusivity) is incomplete. Jealousy is viewed as a label given to a complex of interrelated emotional, cognitive, and behavioral processes. New research is presented that suggests that jealousy is related to certain features of romantic relationships.The author wishes to thank Melissa Jaffee, Kathy Kephart, and Donna Schwartzman for their help in administering and scoring the questionnaires. Computer time for data analysis was donated by the Computer Science Center of the University of Maryland.     

An on-line laboratory in sensation and perception

Three components of a teaching laboratory in perception are described that (1) compare several psychophysical methods for measuring visual illusions, (2) simulate experiments on dark adaptation, and (3) allow participation in auditory demonstrations or experiments. Features of special interest include: interactive use of graphics, software for simulating experiments (such as EXPER SIM, University of Michigan), and use of A/D, D/A, and TTL ports to interface special peripherals.     

A Follow-up Dual-Task Investigation of Lateralized Effects in Right- and Left-Handed Males

A dual-task follow-up investigation examined the influence of sample size and ideational complexity of cognitive tasks on lateralized effects. With a larger sample (n = 128), results showed a "manual dominance effect" for relaxed and paced nonideational vocalized tasks. A hierarchy of ideational verbal tasks yielded the expected lateralized effects which corresponded with increasingly greater interference in concurrent tapping, but not in strength of lateralized effect. Instead of a trend seen in the earlier work (Steiner, Green, & White, 1992), results revealed a significant difference between handedness groups for one complex spatial task. Finally, outcomes for the other spatial task highlight the importance of assessing tradeoffs in attention.     

An investigation of the differential-outcomes effect within sessions

The differential-outcomes effect is manifest as more accurate performance of a delayed conditional discrimination when alternative choice responses are followed by different reinforcers than when they are followed by the same reinforcer. In Experiment 1, a differential-outcomes effect was demonstrated within sessions by signaling the duration of food access for correct responses with stimuli appearing in conjunction with the sample stimuli. The delayed matching-to-sample performance of 5 pigeons was more accurate when green choice responses (matching a green sample) were followed by 3.5-s food access and red choice responses (matching a red sample) were followed by 0.5-s food access (different-outcome trials) than when the correct choice responses were both followed by 1.5-s reinforcers (same-outcome trials). In Experiment 2, the acquisition of this differential-outcomes effect was characterized by a progressive decrease in rate of forgetting on different-outcome trials and no change in rate of forgetting on same-outcome trials. In addition, accuracy at the shortest delay intervals for both different-outcome and same-outcome trials increased over acquisition, but to a greater extent for different-outcome trials. These data suggest that both memorial and attentional (time-dependent and time-independent) factors contribute to the differential-outcomes effect.     

The behavioral theory of timing: Reinforcer rate determines pacemaker rate

In the behavioral theory of timing, pulses from a hypothetical Poisson pacemaker produce transitions between states that are correlated with adjunctive behavior. The adjunctive behavior serves as a discriminative stimulus for temporal discriminations. The present experiments tested the assumption that the average interpulse time of the pacemaker is proportional to interreinforcer interval. Responses on a left key were reinforced at variable intervals for the first 25 s since the beginning of a 50-s trial, and right-key responses were reinforced at variable intervals during the second 25 s. Psychometric functions relating proportion of right-key responses to time since trial onset, in 5-s intervals across the 50-s trial, were sigmoidal in form. Average interpulse times derived by fitting quantitative predictions from the behavioral theory of timing to obtained psychometric functions decreased when the interreinforcer interval was decreased and increased when the interreinforcer interval was increased, as predicted by the theory. In a second experiment, average interpulse times estimated from trials without reinforcement followed global changes in interreinforcer interval, as predicted by the theory. Changes in temporal discrimination as a function of interreinforcer interval were therefore not influenced by the discrimination of reinforcer occurrence. The present data support the assumption of the behavioral theory of timing that interpulse time is determined by interreinforcer interval.     

The availability and importance of Denominational Support Services as perceived by Clergy Husbands and their wives

Previous research by Morris and Blanton (1994b) used the Denominational Support Service Checklist (DSSC) to determine whether or not denominations were providing support services in any organized/systematic way to the clergy and their wives in their denomination. The DSSC has a yes/no format containing 21 support services that are divided into four areas of support. The four areas of support services included psychological services (3), career development services (6), family oriented services (7), and financial services (5). As a follow-up to the previous study, the purpose of this study was to examine the perceptions of clergy husbands and their wives regarding the availability and importance of support services provided by their sponsoring denomination. The sample of the study included 136 ordained married clergy males and their non-clergy spouses (n=272) randomly selected from six denominations in the United States. The six denominations included the Southern Baptist Convention (SBC); Lutheran Missouri Synod (LMS); Church of God, Cleveland, Tennessee (COG); Seventhday Adventists (SDA); the American Baptist Church (ABC); and the Episcopal Church (EC). Each husband and wife completed The Perceived Availability of Denominational Support Services (PADSS) and The Perceived Importance of the Denominational Support Service (PIDSS). The PADSS has a yes/no format and the PIDSS is a 3 point Likert-type questionnaire that corresponds identically (e.g., 21 items divided into four support areas) with the DSSC. Findings from the study indicated that a majority of clergy and their wives perceived that their sponsoring denominations were not making available those services that they perceived were important. Additionally, gender differences in reports of availability and importance were found indicating that some denominations may not be providing support services that enhance the quality tof life for the entire clergy family system. Recommendations and suggestions are made to encourage and guide denominations in providing support services for clergy families.