Agglomerative Algebras

Journal of Philosophical Logic - This paper investigates a generalization of Boolean algebras which I call agglomerative algebras. It also outlines two conceptions of propositions according to...     

Assessing functions of stimuli associated with rich‐to‐lean transitions using a choice procedure

Under fixed‐ratio schedules, transitions from more to less favorable conditions of reinforcement (rich‐to‐lean transitions) usually generate extended pausing. One possible explanation for this effect is that stimuli associated with rich‐to‐lean transitions are aversive and, thus, extended pausing functions as escape. The purpose of this study was to characterize further the aversive function of different transitions, and the stimuli associated with them, by allowing pigeons to choose to complete select ratios in the presence of either a mixed‐schedule stimulus or a transition‐specific multiple‐schedule stimulus. The mixed schedule was preferred during transitions that signaled an upcoming lean reinforcer (rich‐to‐lean and lean‐to‐lean), whereas the multiple schedule was preferred during transitions that signaled an upcoming rich reinforcer (lean‐to‐rich and rich‐to‐rich). These findings support the notion that stimuli associated with rich‐to‐lean (and to some extent lean‐to‐lean) transitions can function aversively; whereas stimuli associated with other transitions (e.g., lean‐to‐rich and rich‐to‐rich) can function as conditioned reinforcers. When the opportunity to choose between schedule‐correlated stimuli was available, however, choice latency was controlled exclusively by the multiple‐schedule stimulus. That is, the opportunity to select the mixed schedule did not attenuate rich‐to‐lean pauses, suggesting that extended pausing may be more than simply escape.     

Leaders and followers behaving badly: A meta-analytic examination of curvilinear relationships between destructive leadership and followers’ workplace behaviors

We draw from social psychological and resource-based theories to meta-analytically examine curvilinear relationships between destructive leadership and followers’ workplace behaviors (i.e., job performance, organizational citizenship behaviors, and workplace deviance). Overall, our meta-analytic results demonstrate that relationships between destructive leadership and followers’ workplace behaviors are essentially linear. The limited evidence of curvilinear relationships we did find supports the application of social psychological theories when examining high levels of destructive leadership. Overall, this study's meta-analytic regression, relative weight, and semipartial correlation results have important implications for how to interpret the conclusions drawn from prior destructive leadership research, how to conduct future studies that examine destructive leadership, and practitioners’ attempts to limit the effects of destructive leadership on followers’ workplace behaviors.     

Individual differences in delay discounting: relation to intelligence, working memory, and anterior prefrontal cortex

Lower delay discounting (better self-control) is linked to higher intelligence, but the basis of this relation is uncertain. To investigate the potential role of working memory (WM) processes, we assessed delay discounting, intelligence (g), WM (span tasks, 3-back task), and WM-related neural activity (using functional magnetic resonance imaging) in 103 healthy adults. Delay discounting was negatively correlated with g and WM. WM explained no variance in delay discounting beyond that explained by g, which suggests that processes through which WM relates to delay discounting are shared by g. WM-related neural activity in left anterior prefrontal cortex (Brodmann's area 10) covaried with g, r= .26, and delay discounting, r=-.40, and partially mediated the relation between g and delay discounting. Overall, the results suggest that delay discounting is associated with intelligence in part because of processes instantiated in anterior prefrontal cortex, a region known to support the integration of diverse information.     

The interactive effects of job advertisement characteristics and applicant experience on reactions to recruitment messages

Job seekers often use job advertisements presented during the early stages of recruitment to gather important information about potential employers. Content of these advertisements as well as associated peripheral cues have the potential to influence job seekers' organizational attitudes. Using the elaboration likelihood model as a theoretical framework, the authors proposed that job seekers' previous work and job search experience moderate the extent to which these job advertisement characteristics influence attitudes towards organizations. Results suggest that the content of job advertisements influence the organizational attitudes of experienced job seekers more than their inexperienced counterparts. Additionally, the presence of peripheral cues (i.e. physical attractiveness of those persons shown in recruitment material) appears to have a greater effect on the organizational attractiveness perceptions of job seekers having less work and job search experience versus those having more experience. Implications of the findings regarding organizational recruitment practices are discussed.     

Dimensions of DSM-IV personality disorders and life-success

This study examined associations between dimensional representations of DSM-IV personality disorders and life-success in a community sample of 304 men at age 48. Measures included a standardized social interview and the SCID-II for assessment of personality disorders. The identified indicators of life-success were factor-analyzed resulting in two moderately correlated components representing "status and wealth" and "successful intimate relationships." Avoidant, obsessivecompulsive, and narcissistic dimensional scores were positively associated with "status and wealth." Inverse relationships were found between dependent, schizotypal, schizoid, and adult antisocial personality disorder dimensions and this domain of life-success. Avoidant, schizoid, and borderline personality disorder dimensions were negatively associated with "successful intimate relationships." The findings suggest that although most personality disorders are associated with impaired psychosocial functioning and life-failure, some personality disorder traits (even if considered as pathological) can contribute positively to one important aspect of life-success: status and wealth.     

Human brain activity time-locked to narrative event boundaries

Readers structure narrative text into a series of events in order to understand and remember the text. In this study, subjects read brief narratives describing everyday activities while brain activity was recorded with functional magnetic resonance imaging. Subjects later read the stories again to divide them into large and small events. During the initial reading, points later identified as boundaries between events were associated with transient increases in activity in a number of brain regions whose activity was mediated by changes in the narrated situation, such as changes in characters' goals. These results indicate that the segmentation of narrated activities into events is a spontaneous part of reading, and that this process of segmentation is likely dependent on neural responses to changes in the narrated situation.