Anatomy of a stimulus domain: The relation between multidimensional and unidimensional scaling of noise bands

Theoretically, there are many possible relationships between multidimensional scaling and unidimensional scalings of the same stimulus domain. In particular, it is uncertain what will happen if the number of psychological “dimensions” exceeds the number of physical variables. The multidimensional scaling of noise bands, unidimensionally a relatively well-understood domain, was done to explore these problems. In correspondence with the number of physical variables, a two-dimensional configuration was found to give a satisfactory account of the judgments of magnitude of stimulus difference. Axes of loudness, volume, and density were found to fit the configuration with a high degree of precision, lending support to the metric value of numbers produced in magnitude estimation. Pitch, or frequency, also had a simple relationship to the configuration, but was not an axis or dimension. Therefore, the usual conceptualization of judgments of overall similarity as the result of combining difference on separate dimensions is questioned. It is suggested that multidimensional configurations may sometimes correspond to internal representations of general importance.     

An analysis of individual differences in similarity judgments about complex random forms

A variation of the method of graded dichotomies was used to obtain judgments of interstimulus similarity for all pairings of 21 12-turn random shapes. Using the Tucker-Messick procedure, a six-dimensional spatial model, representing individual variation in performance on the task, was derived. Six “idealized individuals” (IIs) were isolated. A five-dimensional Euclidean spatial model was obtained for each II using the Shepard-Kruskal scaling technique. The resulting psychological dimensions of perceived form were related to two sets of physical measures on the forms: the factor space suggested by Brown and Owen and a set of more basic physical measures. These basic measures allowed interpretation of most of the psychological dimensions and revealed differences between IIs in patterns of cue utilization.     

Intrusiveness and Closeness-Caregiving: Rethinking the Concept of Family “Enmeshment”

This article analyzes the concepts of “enmeshment” and “cohesion” and their entanglement in the field of family therapy. Early theories in this area were concerned primarily with processes of self/other differentiation. More recent theories have favored spatial metaphors that emphasize closeness-distance. We contend that self/other differentiation and closeness-distance are different classes of behavior and that their linkage in the literature has obscured useful distinctions. Our analysis reveals two separate dimensions that clinicians and researchers should consider: Intrusiveness (including coercive control, separation anxiety, possessiveness/jealousy, emotional reactivity, and projective mystification); and Closeness-Caregiving (including warmth, time together, nurturance, physical intimacy, and consistency). We give definitions of these constructs and briefly examine their clinical and gender-related implications.     

Judgment Processes and Interpersonal Conflict Related to Societal Problem Solutions1

An application of multidimensional scaling to judgments about potential solutions to the overpopulation problem yielded two dimensions: Voluntary versus involuntary and economic versus noneconomic. The location of the “solutions” in this two dimensional space was closely related to their judged acceptability, for both original and cross-validation samples. The two-dimensional coordinates of the “solutions” were then used as implicit cue values in a “lens model” analysis of potential conflict among the subjects. This analysis indicated that judgmental inconsistency was likely to be the major source of conflict for these subjects.     

Intraindividual variability in driving simulator parameters of healthy drivers of different ages

Intraindividual variability is a fundamental behavioural characteristic of aging but has been examined to a very limited extent in driving. This study investigated intraindividual variability in driving simulator measures in healthy drivers of different ages using the coefficient of variation (COV) as a variability measure. Participants were healthy volunteers who were regular drivers, who were divided into a “young” group, a “middle-aged” group, and an “old” group. They drove in two environments (rural, 72 drivers; urban, 60 drivers), under conditions of moderate and high traffic load, without and with distraction (conversation). Significant differences in COV were observed in the rural condition for headway distance and lateral position as a function of traffic load, with high traffic (without and with distraction) resulting in increased COV of headway and decreased COV of lateral position. Significant differences in COV were observed in the urban condition for headway distance only, with high traffic (without and with distraction) resulting in increased COV of headway. No age effects were found for any of the driving conditions. The results indicate that traffic load affected headway distance and lateral position in opposite directions in all three age groups: high traffic resulted in increased variability of headway in both rural and urban conditions but in decreased variability of lateral position in the rural conditions compared to moderate traffic irrespective of distraction. The study indicates that driving conditions affect the intraindividual variability of driving measures in selective ways, which may be linked to the extent of automatization of the driving variables and to adaptive changes to traffic condition challenges.     

Context effects,reliability, and internal consistency of intermodal joint scaling

Context effects, intraindividual variability, and internal consistency of intermodal joint scaling with magnitude estimation (“magnitude matching”) were studied by instructing 12 subjects to judge the three pairs of odor intensity, loudness, and brightness on a common scale of perceived intensity as well as to judge odor intensity separately (unimodal magnitude estimation). Significant context effects were found by comparing odor intensity judgments obtained by separate versus intermodal joint scaling as well as across different modalities (loudness vs. brightness) in joint scaling. But no such effects were found for loudness or brightness when compared across modality of joint scaling. Intraindividual variability in the estimates imply about equal reliability in intermodal joint scaling and separate scaling. Good internal consistency was found, indicating that subjects are successful in expressing perceived intensities of different modalities on a common scale.     

THE EFFECTS OF AN ENVIRONMENTAL “ENRICHMENT” PROGRAM ON THE BEHAVIOR OF INSTITUTIONALIZED PROFOUNDLY RETARDED CHILDREN

This study determined the effects of procedures designed to “enrich” the physical and social environment of an institutional ward on the “adaptive” and “maladaptive” child, adult, self, and object-directed behaviors of five profoundly retarded ambulatory females. Behavior observed in two treatment conditions, an environment “enriched” with toys and objects and an “enriched” environment coupled with differential reinforcement of adaptive behavior, was compared to behavior occurring in corresponding baseline or “austere” conditions and during a period of noncontingent reinforcement. The results generally revealed: (1) little change in adaptive and maladaptive child and adult-directed behavior across conditions, (2) an overall higher incidence of adaptive object-directed behavior and reduced self-directed maladaptive behavior in each treatment condition from that observed in corresponding control conditions, and (3) the use of an “enriched” environment and differential reinforcement of adaptive behavior resulted in maladaptive self-directed behavior being reduced and adaptive object-directed behavior being increased beyond that observed in the “enriched” environment alone. These behavioral gains were largely maintained during a follow-up condition by continuing the “enriched” environment and transferring the responsibility for differential reinforcement to direct-care staff.     

Evidence against “absolute” scaling

Zwislocki and Goodman (1980) argue that there exists an “absolute coupling” of numbers to sensation magnitudes and conclude that, when subjects are left unconstrained by a designated stimulus-number pair, they may use this “absolute” scale. The purpose of the studies reported here was to test whether Zwislocki and Goodman’s (1980) absolute scaling procedure reduces contextual effects due to variations in the stimulus spacing. It was found that magnitude estimations vary as a function of the stimulus spacing, regardless of whether subjects are instructed to use a standard and modulus, and, furthermore, that category ratings yield effects of the stimulus spacing comparable to those obtained with magnitude estimations. It is argued that removing the so-called constraints of a standard and modulus does not yield an “absolute” scale of sensation. The absolute scaling procedure increases response variability and thereby lowers the power of a test for contextual effects.     

The clustering of health-related occupational stressors among contemporary wage-earners

In this study, it is investigated whether a typology can be imposed upon a sample of wage-earners, based on their exposure to a broad number of occupational stressors: quantitative, emotional, and physical demands, repetitive movements, atypical schedules, low job control, relationships with superiors, job insecurity, and bullying behaviour. Also associations between this typology and measures of emotional problems (EP) and musculoskeletal complaints (MC) are tested. Logistic regression and a latent class cluster analysis are performed on a representative sample of 10,074 Flemish (Belgian) employees. Five clusters are revealed: “low stress”, “high stress”, “manual-passive”, “human contact”, and “high demand”. These clusters are showing a clear socioeconomic distribution and distinct associations with EP and MC—with the “high stress cluster” being the most problematic. Health-damaging occupational stress clusters are prevalent at both higher and lower socioeconomic positions. This is suggesting a complex relationship between occupational stressors and socioeconomic health variations.     

Cree Conceptions of Cognitive Competence

The study of cognitive competence in various cultures has shifted from examining “general intelligence” (very often only in terms known to Western cultures), to a concern for indigenous conceptions of what it means to be a capable person in that culture. Ethnographic techniques elicited the range of Cree terms for such general competence. With a sample of 60 Cree adults in Northern Ontario (stratified by age and sex), we obtained card sorts for 20 terms (piles sorted on basis of similarity), and semantic differential ratings (on 12 bipolar adjective dimensions), for two of the terms. A two-dimensional solution was obtained using Multidimensional scaling. On one dimension there was a cluster of core terms (e.g. wise, thinks hard, pays attention, respectful, good sense of direction) at one end, and three other terms (stupid, crazy, “backwards knowledge”) at the other. On the second dimension, a pair of terms translated as “mentally tough” (with implications of perseverance, stamina, bravery) was at one end, and two other terms (understands new things, religious) were at the other. The term for “lives like a white person” was opposite the core cluster of terms for Cree competence. Ratings of the two terms (“wise” and “understands new things”), indicate that both are associated with: Taking time, good, hard-working, careful, patient, self-sufficient, strong, developing, bush-related, and easy to see. These results indicate some clear differences from Western notions of intelligence as being fast, analytic and without social or moral dimensions.     

Developing Guidelines for Domestic Violence Offender Programs

Summary

This article reviews research on domestic violence that can help inform the development of guidelines for programs for men who batter. It also illustrates some successes and problems in other fields that might be instructive for the domestic violence field. Firm conclusions about “best practice” guidelines for intervention seem to be premature because of flaws in evaluation studies. In addition, there is growing evidence of variability among men who batter on dimensions such as severity of violence, childhood traumas, generality of violence and personality traits. Programs also need to be able to respond to motivational and cultural difference among abusers. Existence of variability implies the need for multiple forms of interventions.     

Comparing the Housing Trajectories of Different Classes Within a Diverse Homeless Population

The paper presents findings from a longitudinal study identifying different classes of homeless individuals in a mid‐size Canadian city based on health‐related characteristics and comparing the housing trajectories of these classes 2 years later. Using data collected through in‐person interviews with a sample of 329 single persons who have experienced homelessness, the paper presents results of a latent class analysis. Results found four distinct latent classes characterized by different levels of severity of health problems—i.e., a class of individuals who are “Higher Functioning” (28.7%), a second class with “Substance Abuse Problems” (27.1%), a third class with “Mental Health Substance Abuse Problems” (22.6%), and a fourth class with “Complex Physical and Mental Health Problems” (21.6%) that included having diminished physical functioning, multiple chronic physical health conditions, mental health difficulties, and in some cases substance abuse problems. Follow‐up interviews with 197 of these individuals (59.9%) 2 years later showed the class of individuals with substance abuse problems experiencing the greatest difficulty in exiting homelessness and achieving housing stability. Implications of these findings for social policy development and program planning are discussed.     

On the “absoluteness” of category and magnitude scales of pain

The concept of “absolute scaling” (Zwislocki & Goodman, 1980) implies that direct judgments of sensory magnitude not only reflect the relative positions of the stimuli being judged, but also permit us to assess level differences in sensation. In order to explore this notion for different scaling methods, in the present investigation we compared magnitude estimation with category partitioning, a verbally anchored categorization procedure, in scaling painful pressure stimuli covering different intensity ranges. The results indicate that when the same stimulus range was presented after 1 week, both methods appeared to be highly reliable, with category partitioning faring somewhat better than magnitude estimation. When the stimulus range was unobtrusively changed between sessions, both methods reflected the within-subjects shift in absolute level. When two different sets of subjects judged the slightly different stimulus ranges, both methods resulted in scale values consistent with absolute scaling, though only category partitioning was sensitive enough to differentiate the two stimulus ranges. The results are discussed in the context of different possibilities of anchoring direct scaling methods in order to obtain “absolute” level information.     

Validating a new method for quantifying traits: The computer-administered visual analog

This article introduces a new method for assessing personality traits that uses graphic rather than written items to facilitate the convergent validation of personality traits. A computer-administered visual analog procedure is presented that samples 40 equally spaced positions along a trait continuum five times. Examinees initiate each trial by pressing the space bar and end it by pressing either a “True” or “False” key indicating if that location describes them or not. Response time is measured in milliseconds. The majority answer determines the aggregate response and the median response time determines the latency for the aggregate response to each location on the trait continuum. This procedure enables an empirical measure of trait variability. Results indicated theoretically meaningful responses in 94 college students on each of two personality dimensions; extraversion and trait anxiety. The predicted inverted-U function was obtained for both personality dimensions such that the fastest response times were associated with 0 and 5 “True” responses, somewhat longer response times were associated with 1 and 4 “True” responses, and the longest times were associated with 2 or 3 “True” responses. Statistically significant and substantial validity coefficients were obtained with the Eysenck personality inventory extraversion scale, and the state-trait anxiety inventory, form Y-2.     

Similarities and differences in the perceptual structure of facial expressions of children and adults

We explored the perceptual structure of facial expressions of six basic emotions, varying systematically in intensity, in adults and children aged 7 and 14 years. Multidimensional scaling suggested that three- or four-dimensional structures were optimal for all groups. Two groups of adults demonstrated nearly identical structure, which had dimensions representing pleasure, potency, arousal, and intensity, despite the fact that one group was tested with a child-friendly “odd-man-out” paradigm and the other group was tested with a conventional similarity-rating paradigm. When tested with the odd-man-out paradigm, the 7-year-olds showed systematic structure, which differed from that of adults in both the meaning of some dimensions and the proximities among some of the expression categories. When tested with similarity judgments, the 14-year-olds showed an adult-like pattern on all measures except that their similarity judgments were more influenced by physical differences than were those of adults. We conclude that an adult-like representation of facial expressions develops slowly during childhood.     

The role of skin coupling in the determination of vibrotactile spatial summation

The method of magnitude estimation was used to determine the psychophysical functions for three forms of subjective automobile speed. Observers experienced linear motion across the visual field, the approach motion of an oncoming car, and “en route” motion as a passenger. All three conditions resulted in power function relations between subjective speed and physical velocity. The respective exponents were 1.0, 1.35, and 1.40. Direct category estimates of en route speed were related linearly to physical velocity, but nonlinearly to subjective speed.     

Identity From Variation: Representations of Faces Derived From Multiple Instances

Research in face recognition has tended to focus on discriminating between individuals, or “telling people apart.” It has recently become clear that it is also necessary to understand how images of the same person can vary, or “telling people together.” Learning a new face, and tracking its representation as it changes from unfamiliar to familiar, involves an abstraction of the variability in different images of that person's face. Here, we present an application of principal components analysis computed across different photos of the same person. We demonstrate that people vary in systematic ways, and that this variability is idiosyncratic—the dimensions of variability in one face do not generalize well to another. Learning a new face therefore entails learning how that face varies. We present evidence for this proposal and suggest that it provides an explanation for various effects in face recognition. We conclude by making a number of testable predictions derived from this framework.     

Longitudinal Impact of Toddlers' Exposure to Domestic Violence

This study assessed how exposure to domestic violence (DV) during early childhood and increases in exposure over time influenced toddlers' behavior and peer problems, physical health, and cognitive abilities in middle childhood. Data from three waves of the survey component of “Welfare, Children, and Families: A Three-City Study” were assessed. Thirty-five percent of the 2- to 4-year-olds had mothers who reported DV victimization; 16% reported an increase in DV victimization over 2 years. Opposing past literature, none of the middle childhood outcomes were significantly influenced by early DV exposure. However, increases in mother's DV victimization from 1999 to 2001 significantly increased children's internalizing and externalizing problems and marginally decreased their school engagement in middle childhood in 2005.