Quantitative Analysis of IRT Variability During the First Training Stages of a Variable-Interval Schedule in Rats

Five rats were reinforced under variable-interval schedules with different average interreinforcement intervals (30 seC., 1 min, 2 min, and 4 min). Each animal was run only two sessions of each schedule. The interresponse times (IRTs) were recorded and analyzed. The autocorrelation function of the IRT series and of the IRT time series (number of responses per time interval) were calculated, and absence of periodicity in the subject’s behavior was demonstrated. Frequency distribution of IRTs showed in all cases a similar shape and could be fitted to a gamma probability density function in 60% of cases with a signification level of .01 (Kolmogorov-Smirnoff test). The frequency distributions of the IRT time series were distributed as a Poisson process with a .05 significance level. These results suggest that during variable-interval schedules the responses of the animal can be modeled as a random process characterized by a gamma distribution, as a first approximation.

     

Individual differences in depression,induced mood,and perception of emotionally toned words

The associative network theory of emotion and memory, outlined by Bower (1981), predicts that depressed mood leads to biases which favour the perception of mood-congruent information. In this study, a lexical decision task was used to assess the effects of degree of depression and induced elation and depression on lexical decision times for positive and negative words. Subsequently, subjects were given a recall test for the words presented during the lexical decision task. The results partially offered support for perceptual bias. The data showed that in non-depressed and elation-induced subjects, decision times were differentially affected by hedonic tone. Words of positive nature were responded to significantly faster than were negative words. In mildly depressed and depression-induced, decision times were similar for both types of words (positive and negative). These findings are discussed in relation to the associative network model and a growing amount of empirical research on human emotion and cognition.     

THE INTERNATIONAL ASSIGNEE: THE RELATIVE IMPORTANCE OF FACTORS PERCEIVED TO CONTRIBUTE TO SUCCESS

The present study sought to empirically identify what factors are important for international assignee perceived success along with their relative importance. Subjects were 338 international assignees from diverse countries (nationality) and organizations, assigned to diverse countries, and performing diverse jobs. Five factors were identified and in a descending order of importance, these were Family Situation, Flexibility/Adaptability, Job Knowledge and Motivation, Relational Skills, and Extra-Cultural Openness. Although importance ratings were not influenced by job type (managerial/nonmanagerial status), they were influenced by organizational type. In general, the pattern of importance ratings for service organization international assignees was different from those of international assignees from other organizational types. Furthermore, service organization international assignees ascribed more importance to relational and psycho-social factors. The perceived relative importance of psycho-social factors reported by the study's participants tends to suggest that more attention should be paid to these factors in the selection and training of international assignees.     

EXPERIENCED HIRING VERSUS COLLEGE RECRUITING: PRACTICES AND EMERGING TRENDS

Although much professional and managerial hiring involves experienced workers, previous recruitment research has focused almost exclusively on new college graduates. To remedy this imbalance, 251 staffing professionals were surveyed concerning experienced-versus-college hiring practices in their organizations. Results suggest that a majority of positions requiring a college degree are filled with experienced workers. Experienced hires are evaluated more highly than new graduates on most characteristics (understanding business, knowledge of competition, realistic expectations, technical skills, interpersonal skills, writing skills, work ethic, likelihood of success, personal ethics), although new graduates are evaluated more highly on open-mindedness and willingness and ability to learn new things. Higher proportions of experienced hiring are associated with organizational growth, short-term staffing strategies, older workforces, and less dynamic business environments. Perceived success of experienced hiring is associated with greater use of effective recruitment sources, older workforces, and more competitive salary offers.     

Instrumental conditioning of diastolic blood pressure in essential hypertensive patients

Eighteen male essential hypertensive patients participated in an experiment designed to compare two strategies for controlling high blood pressure. Each strategy was derived from the instrumental learning literature, and the aim was to treat the blood pressure response as an operant and determine the most effective conditioning procedure for manipulating it. The results demonstrate that patients could be conditioned to lower blood pressure by 20% to 30% over a period as brief as four days by providing an external signal and verbal praise contingent upon each reduction in diastolic pressure that met a pre-set criterion.     

THE NEW UNIFORM GUIDELINES ON EMPLOYEE SELECTION PROCEDURES IN THE CONTEXT OF UNIVERSITY PERSONNEL DECISIONS

The new Uniform Guidelines on Employee Selection Procedures are considered in a context of university employment decisions. The use of student evaluations as valid criteria for faculty personnel decisions such as hiring, retention, tenure, promotion, or salary increases is examined. Standards of validity contained in the Guidelines are probably not being met with regard to most student rating forms currently used. Recommendations are made regarding use of student and administrators' ratings as criteria for personnel decisions. The need for studies on contaminating sources of variance in ratings is emphasized.     

Self-disclosure of HIV infection: preliminary results from a sample of Hispanic men.

We examined self-disclosure of HIV infection among 101 seropositive Hispanic men residing in Los Angeles. Results indicated that disclosure was highly selective and presumably influenced by the social, psychological, and material consequences of informing others about one's medical condition. Subjects tended to inform significant others such as parents, friends, and lovers than less significant others such as employers, landlords, and religious leaders. There was a relatively high rate of disclosure (75%) to doctors/dentists who were not treating subjects for HIV infection. Gay and bisexual subjects (89% of the sample) were more inclined to disclose their HIV serostatus to homosexual or bisexual others than to heterosexuals and to inform those who were aware of their sexual orientation. Disclosure increased with severity of disease independently of length of time since testing seropositive. Self-rated negative changes in appearance correlated with disclosure to less significant others. The role of cultural attitudes and values in self-disclosure of HIV infection is discussed.