Carbon dioxide as a reinforcer in escape conditioning

The effects of varying CO₂ concentration, and intervals between CO₂ presentations, were determined from the performance by five pigeons of a learned motor act which eliminates CO₂ from the inspired air. The length of time from the onset of an externally-produced increase in inspired CO₂ to the performance of the learned motor response terminating the CO₂ presentation was inversely related to the CO₂ concentration presented (3 per cent and 5 per cent) and directly related to the inter-trial interval (3 minutes and 1.5 minutes). Chemoreceptors on the ventrolateral surfaces of the medulla are postulated to be the initial site of stimulation in the chain of events leading to the behavioral bioregulation of inspired CO₂ concentration.     

Interindividual‐intergroup discontinuity as a joint function of acting as a group and interacting with a group

An experiment assessed the prisoner's dilemma game (PDG) choices of a set of three persons who interacted with another supposed set of three persons. There were four conditions: (1) group‐on‐group (both three‐person sets constrained by a majority vote), (2) group‐on‐one (only own three‐person set constrained by a majority vote), (3) one‐on‐group (only other three‐person set constrained by a majority vote), (4) one‐on‐one (neither three‐person set constrained by a majority vote). The four conditions were compared with three orthogonal contrasts. Consistent with the assumption that interindividual interactions are less competitive than interactions involving groups, the first contrast indicated that there were fewer competitive choices in the one‐on‐one condition than in the other three conditions pooled. Consistent with the assumption that competitiveness can flow either from acting as a group or interacting with a group, the second contrast found no significant difference between the group‐on‐one and one‐on‐group conditions. Finally, consistent with the assumption that the interindividual‐intergroup discontinuity effect is a joint function of acting as a group and interacting with a group, the third contrast revealed that there were more competitive choices in the group‐on‐group condition than in the one‐on‐group and group‐on‐one conditions pooled. Copyright © 2006 John Wiley & Sons, Ltd.     

The NPI-16 as a short measure of narcissism

Narcissism has received increased attention in the past few decades as a sub-clinical individual difference with important everyday consequences, such as self-enhancement in perceptions of one’s own behavior and attributes. The most widespread measure used by non-clinical researchers, the 40-item Narcissistic Personality Inventory or NPI-40, captures a range of different facets of the construct but its length may prohibit its use in settings where time pressure and respondent fatigue are major concerns. In this article, we draw from the NPI-40 set of items to create and validate a shorter, unidimensional measure, the NPI-16. In five studies, we show that this short NPI closely parallels the NPI-40 in its relation to other personality measures and dependent variables. We conclude that the NPI-16 has notable face, internal, discriminant, and predictive validity and that it can serve as an alternative measure of narcissism when situations do not allow the use of longer inventories.     

An evaluation of the consequences of using short measures of the Big Five personality traits

Researchers often use very abbreviated (e.g., 1-item, 2-item) measures of personality traits due to their convenience and ease of use as well as the belief that such measures can adequately capture an individual's personality. Using data from 2 samples (N = 437 employees, N = 355 college students), we show that this practice, particularly the use of single-item measures, can lead researchers to substantially underestimate the role that personality traits play in influencing important behaviors and thereby overestimate the role played by new constructs. That is, the use of very short measures of personality may substantially increase both the Type 1 and Type 2 error rates. We argue that even slightly longer measures can substantially increase the validity of research findings without significant inconvenience to the researcher or research participants.     

An evaluation of methylphenidate as a potential establishing operation for some common classroom reinforcers.

We conducted reinforcer assessments for 3 boys with a diagnosis of attention deficit hyperactivity disorder who alternately received either placebo or previously prescribed methylphenidate. Our purpose was to evaluate whether methylphenidate altered the relative reinforcing effectiveness of various stimuli that are often used in classroom-based behavioral treatment programs (e.g., activities, tangible items). Results showed clear differences for some stimuli between reinforcer assessments conducted when participants had received methylphenidate compared to placebo. Results suggest that methylphenidate might act as an establishing operation for some common classroom reinforcers. Implications for the development and evaluation of behavioral treatments are discussed.     

An evaluation of a community outreach program

A contact and counseling service for youth was examined with regard to the awareness of the program and its nature, the utilization of it, and the evaluation of it by the population of youth at risk. The program was evaluated both by a novel, unobtrusive approach to data-collection for use in a milieu where conventional methods were inoperable, and by an analysis of records from the agency. In addiction, process and activity observations of staff and clients were found to be useful for the evaluation of the agency's activities. The results indicated high levels of consumer awareness, mixed levels of utilization, positive evaluation, and an appropriate perception of goals and activities by the potential and actual users.     

Psychological distance as a means of evaluation

The psychological distance of objects (e.g., things, places, other people) affects how we think about them. Research suggests that psychological proximity and distance might be also related to positive and negative evaluations, respectively. In this study, we examined whether we can infer how children aged 13–16 years evaluate objects based on their statements regarding the psychological distance between themselves and these objects. Using a mixed-methods design, we verified the relationship between evaluations of objects and whether they are perceived as psychologically close or distant, in a sample of secondary school students. School subjects were predominantly used as evaluation objects. Students used a worksheet that allowed them to visually demonstrate perceived psychological distance between themselves and objects, and then they were asked to explain their choice. Results suggested a strong association between psychological distance and positive or negative evaluation. Thus, the implications of our findings may be relevant for psychodiagnostics.     

Work planning and performance review as a basis for merit pay decisions: An evaluation

The Work Planning and Performance Review (WPPR) System, developed in a midwestern state as a basis for pay-for-performance decisions in the state government, is described. The WPPR's job relevance was evaluated in one state agency by comparing WPPR scores with scores on a behavioral checklist developed for that purpose. Supervisor and subordinate perceptions of the relevance of the two systems are described. Comparison and perception data indicate the WPPR lacks content validity. Probable impact on the merit pay system is discussed.