The scientific use of ‘representation’ and ‘function’: avoiding explanatory vacuity

Nearly all of the ways philosophers currently attempt to define the terms ‘representation’ and ‘function’ undermine the scientific application of those terms by rendering the scientific explanations in which they occur vacuous. Since this is unacceptable, we must develop analyses of these terms that avoid this vacuity. Robert Cummins argues in this fashion in Representations, Targets, and Attitudes. He accuses ‘use theories’ of representational content of generating vacuous explanations, claims that nearly all current theories of representational content are use theories, and offers a non-use theory of representational content which avoids explanatory vacuity. One task I undertake in this article is to develop an alternative non-use theory which avoids an objection fatal to that theory. My second task is to adapt Cummins’ argument to criticize most current analyses of ‘function,’ which undermine scientific explanation in an analogous way. Though Cummins does not explicitly argue in this manner, his own analysis of ‘function,’ by avoiding any appeal to use, avoids the explanatory vacuity to which they succumb. Consequently, I endorse Cummins’ notion of function. However, although use theories fail as analyses of the terms ‘representation’ and ‘function,’ they can still make significant contributions to the sciences employing these terms. For, while philosophers seeking to define ‘representation’ and ‘function’ must avoid incorporating representational and functional uses into their definitions, scientists must still find a way to determine which representations and functions are being used. Suitably re-construed use theories of representation and function may in many cases assist them in this task.     

Negative Affectivity and Drinking in Adolescents: An Examination of Moderators Predicted by Affect Regulation Theory

This investigation examined potential moderators of the longitudinal relation between negative affectivity and drinking. Specifically tested was the degree to which alcohol expectancies and coping styles moderate the relation between negative affectivity in early adolescence and drinking in middle and late adolescence. Four hundred ninety nine early adolescents completed inventories of negative affectivity, coping style, and tension reduction expectancies, and were followed up with inventories of drinking in middle and late adolescence. Constructive coping moderated the relation between negative affectivity and drinking in middle adolescence, such that only those with poor coping skills exhibited this positive relation. Although early negative affectivity was directly related to drinking in late adolescence, no interactions between negative affectivity and expectancies or coping were detected for drinking at that age. This absence of consistent moderating effects indicates significant limitations in the ability of the traditionally-conceived affect regulation model to reliably predict adolescent drinking. This research was conducted at the Center for Education and Drug Abuse Research (CEDAR) which is located in the School of Pharmaceutical Sciences at the University of Pittsburgh and is supported by grant P50-DA-05605 from the National Institute on Drug Abuse.     

The indexicality of ‘knowledge’

Epistemic contextualism—the view that the content of the predicate ‘know’ can change with the context of utterance—has fallen into considerable disrepute recently. Many theorists have raised doubts as to whether ‘know’ is context-sensitive, typically basing their arguments on data suggesting that ‘know’ behaves semantically and syntactically in a way quite different from recognised indexicals such as ‘I’ and ‘here’ or ‘flat’ and ‘empty’. This paper takes a closer look at three pertinent objections of this kind, viz. at what I call the Error-Theory Objection, the Gradability Objection and the Clarification-Technique Objection. The paper concludes that none of these objections can provide decisive evidence against contextualism.     

The Difficulty of Making Psychology Research and Clinical Practice Relevant to Medicine: Experiences and Observations

Psychology and medicine research and practice have demonstrated substantial and unique bodies of knowledge designed to both improve patient care and respond to contemporary health care needs for use of evidence and cost consciousness. At their full potential they represent a significant paradigm shift in healthcare. Despite impressive successes, it is clear that we are just on the cusp of such a change. These findings have had limited impact and penetration into medical practice, particularly outside of academic medicine and large, organized systems of health care, and there are multiple examples of such limitations in various arenas of health care. There also appear to be common themes to such examples which provide us opportunities to consider how psychologists might move things ahead. They also suggest how our unique position in academic medicine can both limit our impact and provide ways of creating continued shifts in the healthcare paradigm. This paper is based in part on the author’s presentation at the Association of Psychologists in Academic Health Centers 3rd National Conference in Minneapolis, Minnesota, May 2007.     

Calculating Impact Factor: How Bibliographical Classification of Journal Items Affects the Impact Factor of Large and Small Journals

As bibliographical classification of published journal items affects the denominator in this equation, we investigated how the numerator and denominator of the impact factor (IF) equation were generated for representative journals in two categories of the Journal Citation Reports (JCR). We performed a full text search of the 1st-ranked journal in 2004 JCR category “Medicine, General and Internal” (New England Journal of Medicine, NEJM, IF = 38.570) and 61st-ranked journal (Croatian Medical Journal, CMJ, IF = 0.690), 1st-ranked journal in category “Multidisciplinary Sciences” (Nature, IF = 32.182) and journal with a relative rank of CMJ (Anais da Academia Brasileira de Ciencias, AABC, IF = 0.435). Large journals published more items categorized by Web of Science (WoS) as non-research items (editorial material, letters, news, book reviews, bibliographical items, or corrections): 63% out of total 5,193 items in Nature and 81% out of 3,540 items in NEJM, compared with 31% out of 283 items in CMJ and only 2 (2%) out of 126 items in AABC. Some items classified by WoS as non-original contained original research data (9.5% in Nature, 7.2% in NEJM, 13.7% in CMJ and none in AABC). These items received a significant number of citations: 6.9% of total citations in Nature, 14.7% in NEJM and 18.5% in CMJ. IF decreased for all journals when only items presenting original research and citations to them were used for IF calculation. Regardless of the journal’s size or discipline, publication of non-original research and its classification by the bibliographical database have an effect on both numerator and denominator of the IF equation. Preliminary results of the study were presented at the 2006 ORI Research Conference on Research Integrity, Tampa, FL, December 1–3, 2006.     

The Role of Pay Satisfaction and Organizational Commitment in Turnover Intentions: A Two-Sample Study

This paper reports the results of a two-sample study—a sample of medical reps from pharmaceutical companies (N = 232) and a sample of respondents from multiple organizations (N = 221)—of the relationships between pay satisfaction, organizational commitment, and turnover intentions. Hypotheses were tested using a multidimensional perspective on both pay satisfaction and organizational commitment. Results from both samples show that the effect of pay satisfaction on intended turnover is fully mediated by affective commitment and perceived sacrifice commitment. Pay satisfaction is also significantly related to normative commitment but the latter has no influence on the outcome. Finally, in the sample of medical reps, pay satisfaction significantly reduces commitment based on lack of employment alternatives, a finding that is interpreted in light of the characteristics of pay systems in pharmaceutical companies. Future directions on compensation satisfaction and commitment research are discussed.     

Trajectories of Parenting Processes and Adolescent Substance Use: Reciprocal Effects

Drawing on transactional theories of child development, we assessed bidirectional links between trajectories of adolescent substance use and parenting processes from early through mid adolescence. Hierarchical generalized models estimated trajectories for 3,317 adolescents from the National Longitudinal Survey of Youth 1997, exploring both between- and within-individual effects. Between individuals, adolescents reporting more regular family activities and greater father and mother knowledge of friends and teachers experienced lower levels of substance use through mid adolescence. Similarly, adolescents with more frequent substance use reported lower family activities, father knowledge, and mother knowledge, though these differences dissipated over time. More conservative within-individual differences indicated a prospective protective effect of family activities, with increases in adolescent participation in family activities predicting later declines in substance use. Results support the central importance of engagement in regular family activities, and suggest the need for further exploration of transactional processes between parents and children in the development of risk behaviors.     

Test of Alternative Hypotheses Explaining the Comorbidity Between Attention-Deficit/Hyperactivity Disorder and Conduct Disorder

There is significant comorbidity between attention-deficit/hyperactivity disorder (ADHD) and conduct disorder (CD). The conclusions of studies that examined the causes of comorbidity between ADHD and CD conflict, with some researchers finding support for the three independent disorders model and others finding support for the correlated risk factors model. We tested these models and eleven alternative hypotheses using the same analytical approach. The participants were 110 monozygotic twin pairs and 181 dizygotic twin pairs recruited from the Colorado Learning Disabilities Research Center Twin Study. The three independent disorders model did not fit the data, whereas the correlated risk factors model fit the data well. Several other comorbidity models fit the data as well as or better than the correlated risk factors model. The results suggest that correlated risk factors are a better explanation for the comorbidity between ADHD and CD than a third, independent ADHD+CD subtype.     

Maternal Predictors of Rejecting Parenting and Early Adolescent Antisocial Behavior

The present study examined relations among maternal psychological resources, rejecting parenting, and early adolescent antisocial behavior in a sample of 231 low-income mothers and their sons with longitudinal assessments from age 18 months to 12 years. The maternal resources examined were age at first birth, aggressive personality, and empathy. Each of the maternal resources predicted rejecting parenting during early childhood in structural equation models that controlled for toddler difficult temperament, and rejecting parenting in early childhood predicted antisocial behavior in early adolescence. Rejecting parenting accounted for the indirect effect of each of the maternal resources on antisocial behavior, but a direct effect was also supported between maternal aggressive personality and youth antisocial behavior. Results highlight the importance of these relatively understudied maternal resources and have implications for prevention and intervention programs that focus on parenting during early childhood.