Measuring clinical pain

There are two goals in attempts to measure, the intention to describe and the intention to compare. These two functions work hand in hand and are brought to fruition in psychological and educational testing only by psychometrics that can produce person-free item calibrations and item-free person measures. The only such psychometrics that currently exist is that based on George Rasch's work. One of the consequences of using the tools Rasch left us is the Pain Scale, a rating scale that asks the person in pain to compare the intensityof his/her own pain with that he/she imagines is described by some 25 adjectives. Analyses of the responses of 53 people with chronic lower back pain to the Pain Scale using the Rasch partial-credit latent-trait model show that they were very much in agreement about the amount of hurt implied by each of the adjectives. An examination of person fit to the partial-credit model gave no hint of a response set in the data but two people did differ very much from their peers in their operational definitions of back pain and were studied separately. The evidence from these two people suggested that they either could not understand the task before them or could not get enough perspective on their pain to describe its intensity.I would like to thank Benjamin Wright and Geoff Masters for their help with this research. Drs. David J. Smith and James B. Boscardin were the first to bring my attention to the problem of measuring pain and were generous in their financial support of this work.     

Testing the conditional independence and monotonicity assumptions of item response theory

When item characteristic curves are nondecreasing functions of a latent variable, the conditional or local independence of item responses given the latent variable implies nonnegative conditional covariances between all monotone increasing functions of a set of item responses given any function of the remaining item responses. This general result provides a basis for testing the conditional independence assumption without first specifying a parametric form for the nondecreasing item characteristic curves. The proposed tests are simple, have known asymptotic null distributions, and possess certain optimal properties. In an example, the conditional independence hypothesis is rejected for all possible forms of monotone item characteristic curves.The author acknowledges Paul W. Holland for valuable conversations on the subject of this paper; Henry Braun and Fred Lord for comments at a presentation on this subject which led to improvements in the paper; Carl H. Haag for permission to use the data in §4; Bruce Kaplan for assistance with computing; and two referees for helpful suggestions. Requests for reprints should be sent to Paul R. Rosenbaum     

Economics, ecologics, and mechanics: The dynamics of responding under conditions of varying motivation

The mechanics of behavior developed by Killeen (1994) is extended to deal with deprivation and satiation and with recovery of arousal at the beginning of sessions. The extended theory is validated against satiation curves and within-session changes in response rates. Anomalies, such as (a) the positive correlation between magnitude of an incentive and response rates in some contexts and a negative correlation in other contexts and (b) the greater prominence of incentive effects when magnitude is varied within the session rather than between sessions, are explained in terms of the basic interplay of drive and incentive motivation. The models are applied to data from closed economies in which changes of satiation levels play a key role in determining the changes in behavior. Relaxation of various assumptions leads to closed-form models for response rates and demand functions in these contexts, ones that show reasonable accord with the data and reinforce arguments for unit price as a controlling variable. The central role of deprivation level in this treatment distinguishes it from economic models. It is argued that traditional experiments should be redesigned to reveal basic principles, that ecologic experiments should be redesigned to test the applicability of those principles in more natural contexts, and that behavioral economics should consist of the applications of these principles to economic contexts, not the adoption of economic models as alternatives to behavioral analysis.     

Psychometric latent response models

In this paper, some psychometric models will be presented that belong to the larger class oflatent response models (LRMs). First, LRMs are introduced by means of an application in the field ofcomponential item response theory (Embretson, 1980, 1984). Second, a general definition of LRMs (not specific for the psychometric subclass) is given. Third, some more psychometric LRMs, and examples of how they can be applied, are presented. Fourth, a method for obtaining maximum likelihood (ML) and some maximum a posteriori (MAP) estimates of the parameters of LRMs is presented. This method is then applied to theconjunctive Rasch model. Fifth and last, an application of the conjunctive Rasch model is presented. This model was applied to responses to typical verbal ability items (open synonym items).This paper presents theoretical and empirical results of a research project supported by the Research Council [Onderzoeksraad] of the University of Leuven (grant number 89-9) to Paul De Boeck and Luc Delbeke.     

Cuban Mothers' Schemas of ADHD: Development, Characteristics, and Help Seeking Behavior

Parents play a crucial role in the diagnosis and treatment of Attention-Deficit Hyperactivity Disorder (ADHD), one of the most prevalent developmental disorders of young children We report the findings of a qualitative study of Cuban-American mothers of 7 to 10 year old children with ADHD. Results suggest that mothers lacked a cultural model for ADHD and held a cultural model of normal child development which hampered their development of a schema of ADHD. Development of ADHD schemas were motivated by perplexity at their children's behavior and by the high value mothers ascribed to academic achievement. Although the schemas developed by the mothers were labeled as ADHD, their behavioral characterizations of their children, their attributions for the condition and for its causes, and their management strategies were not always in agreement with those of the biomedical model for the condition. However, once mothers classified their children's behavior as atypical, they actively sought assistance from the professional sector.     

‘Attentional Bias’ in correlation judgments? Smedslund (1963) revisited

Smedslund (1963) reports one of the first studies that investigated human judgments of correlation. Smedslund's conclusion, that people reason about correlation mostly from a consideration of the number of times two variables co-occur, has become textbook wisdom (e.g. Baron's "attentional bias", 1994). Yet the data reported in Smedslund's paper fall short of endorsing such a conclusion. After reviewing the original paper, we present the method with which we replicated Smedslund's main experiment. In Experiment 1 subjects were presented with symptom-disease correlation data through a simulated medical diagnosis task. Subjects clearly discriminated between data sets which shared an equal number of symptom-disease co-occurrences but which otherwise showed different levels of correlation. Subjects' diagnoses showed a propensity to predict the disease in the presence of the symptom, and symptom-disease co-occurrences were overestimated in two of the five data sets presented to the subjects. Experiment 2 used a novel abstract scenario with a symmetric predictor variable. Judgments again indicated good discrimination, and biases in prediction responses and case recall were eliminated. In both experiments, judgments of zero correlation were a function of the outcome base rate. We evaluate and contrast the extent to which Cheng's (1997) model of causal induction and two associative models, Rescorla and Wagner (1972) and Pearce (1987) can anticipate the observed pattern in the mean judgments.     

A general model for preferential and triadic choice in terms of centralF distribution functions

A model for preferential and triadic choice is derived in terms of weighted sums of centralF distribution functions. This model is a probabilistic generalization of Coombs' (1964) unfolding model and special cases, such as the model of Zinnes and Griggs (1974), can be derived easily from it. This new form extends previous work by Mullen and Ennis (1991) and provides more insight into the same problem that they discussed.     

ECOLOGY AND ESCHATOLOGY: SCIENCE AND THEOLOGICAL MODELING

Abstract. The possibility of in-breakings of God in science is discussed. A realist philosophy of science is used as a framework in which new paradigms are seen as providing ever better approximations to the true underlying structure of nature, which will be revealed in the eschaton. It is argued that ecology–the study of the earth as a whole–cannot be treated as a natural science because there can be no paradigms for understanding the earth as a whole. Instead technology is used as a means for interacting with God through nature.     

Applying developmental previewing to the principles of family therapy

This paper discusses the application of principles of infant psychiatry to the diagnosis and treatment of multigenerational family conflict. Using a technique referred to as previewing, the therapist can focus on the interpersonal meaning that the infant's development precipitates in the family and determine how the parents' relationships with the infant replicate their relationships with their own families of origin. The therapist may then use these insights for overcoming conflict and for acclimating parents to new developmental skills in an optimal manner. Specific suggestions for how parents may promote more adaptive patterns of interaction with the infant using previewing are offered.