Similarity and inhibition in long-term memory: evidence for a two-factor theory

Recalling a past experience often requires the suppression of related memories that compete with the retrieval target, causing memory impairment known as retrieval-induced forgetting. Two experiments examined how retrieval-induced forgetting varies with the similarity of the competitor and the target item (target-competitor similarity) and with the similarity between the competitors themselves (competitor-competitor similarity). According to the pattern-suppression model (M. C. Anderson & B. A. Spellman, 1995), high target-competitor similarity should reduce impairment, whereas high competitor-competitor similarity should increase it. Both predictions were supported: Encoding target-competitor similarities not only eliminated retrieval-induced forgetting but also reversed it, whereas encoding competitor-competitor similarities increased impairment. The differing effects of target-competitor and competitor-competitor similarity may resolve conflicting results concerning the effects of similarity on inhibition.     

Positive behavior support and applied behavior analysis

This article reviews the origins and characteristics of the positive behavior support (PBS) movement and examines those features in the context of the field of applied behavior analysis (ABA). We raise a number of concerns about PBS as an approach to delivery of behavioral services and its impact on how ABA is viewed by those in human services. We also consider the features of PBS that have facilitated its broad dissemination and how ABA might benefit from emulating certain practices of the PBS movement.     

External correlates of the MMPI-2 content component scales in mental health inpatients

External correlates of the Minnesota Multiphasic Personality Inventory-2 (MMPI-2) Content Component Scales were identified using an inpatient sample of 544 adults. The Brief Psychiatric Rating Scale (BPRS) and Symptom Checklist 90-Revised (SCL-90-R) produced correlates of the Content Component Scales, demonstrating external validity with clinician-rated and self-report scales. Relationships between MMPI-2 Content Component Scales and patient hospital chart variables were also examined. Results demonstrated cross-criterion validity in that most MMPI-2 Content Component Scales correlated with appropriate BPRS dimensions, SCL-90-R items, and other patient variables. Discriminant validity of the Content Component Scales was also demonstrated. In addition, the finding that similar patterns of correlates are produced when the component scales are correlated with a self-report measure, as well as clinician ratings and medical chart variables, provides converging lines of evidence supporting the construct validity of the Content Component Scales.     

Heart rate and ratings of perceived exertion during treadmill and elliptical exercise training

Elliptical exercise has recently increased in popularity. However, little is known regarding heart rate and perceptual responses during this exercise mode even though such information is important with respect to prescribing and regulating exercise intensity. In the current study, heart rate and perceived exertion were compared between treadmill and elliptical exercise. During treadmill exercise (TM(EST)) participants estimated RPE-Overall as well as RPE-Legs and RPE-Chest. Two elliptical sessions followed: (1) RPE estimation during elliptical exercise (EL(EST)): HR (b/ min.) from TM(EST) was achieved during elliptical exercise, with participants estimating RPE-Overall, RPE-Legs, and RPE-Chest. (2) RPE production during elliptical exercise (EL(PROD)): RPE-Overall from TM(EST) was produced during elliptical exercise. There were no significant differences between modes for RPE-Overall (TM(EST): 11.2 +/- 2.2 vs EL(EST): 11.9 +/- 3.2) or RPE-Chest (TM(EST): 11.0 +/- 2.4 vs EL(EST): 11.7+/- 3.2). Mean RPE-Legs was significantly different (TM(EST): 11.2 +/- 2.4 vs EL(EST): 12.5 +/- 3.1). Heart rate was not significantly different between TM(EST) (163 +/- 16.6) and EL(PROD) (159 +/- 20.0). Analysis indicated elliptical exercise is perceived as more intense with respect to leg (RPE-Legs) exertion. Further, RPE-Overall appears effective for regulating heart rate during elliptical exercise.     

Some normative data on mental health professionals' attitudes about racial minorities and women

Although codes of ethics of the mental health professions and the recently developed race- and gender-specific models of counseling and psychotherapy stipulate positive and accepting attitudes toward racial minorities and women, formal assessment of these attitudes has been hindered by the absence of appropriate measurement tools and generalizable data. This study provides some normative data by reporting responses of 705 psychologists and social workers to the Quick Discrimination Index, a psychometrically sound 23-item self-report measure previously administered to several different professional groups. Analysis indicated psychologists and social workers reported particularly positive attitudes toward racial minorities and women but expressed the same racial and sex contradictions, ambivalences, and vulnerabilities reported by the general public.     

Perception of the horizontal and vertical in tangible displays: minimal gender differences

A study is reported of gender differences in a haptic version of three Piagetian tests that assess understanding of Euclidian space. A raised-line drawing kit was used both for subject responses and for production of stimuli. To test understanding of the horizontal, subjects felt pictures of a jar at four tilts and were asked to draw the water line. Two methods were used to examine understanding of the vertical. First, subjects drew a hanging electrical cord and light bulb, attached to the ceiling of a bus, parked on hills of four different angles. Subsequently, subjects drew telephone poles (represented by a single line) on hills of four different angles. In the jar task, males and females showed comparable performance, both groups showing large errors. Judgments of the vertical were very similar for males and females in the bus task, but errors diminished considerably for both genders when subjects drew telephone poles on hills. It is suggested that better judgments of the vertical in the pole task probably derive from the use of body-centered spatial reference information.     

In What Sense Are Positive and Negative Affect Independent?

We agree with most of the claims made by Tellegen, Watson, and Clark: Pleasant and unpleasant affect (i.e., happiness and unhappiness) are strongly negatively correlated; random and nonrandom error need to be taken into account before interpreting correlations among affect scales; scales of positive affect (PA) and negative affect (NA) embedded within the affective circumplex are orthogonal in theory, as are pleasure and arousal; and two-dimensional views of the affective space are more valid and useful than one- or three- dimensional models. Finally, and most important, we agree that PA and NA, as typically operationalized, are not independent, despite what may be the case theoretically. In this brief rejoinder, we offer some reasons why measurement problems likely prevent PA and NA from being measured orthogonally, why the factor analytic work reported in the target article is unlikely to shed new light on the perplexing problem of how best to characterize and measure affect, and why Pleasantness and Arousal tend to be operationally superior to their PA and NA counterparts.     

Static, dynamic, and causative bipolarity of affect.

In what sense are pleasant and unpleasant moods "bipolar"? One must differentiate three types of affective bipolarity: static bipolarity (the zero-order correlation between measures of pleasant and unpleasant affect, net of distortions due to measurement error, tends to be strongly negative), dynamic bipolarity (pleasant and unpleasant feelings generally change in opposite directions and to approximately the same extent), and causative bipolarity (the influence of pleasant and unpleasant affect on other variables is approximately equal and opposite). It is argued that static bipolarity is often attenuated by measurement error, dynamic bipolarity can be masked by asymmetrical scaling artifacts, and causative bipolarity is often obscured by both. The experience and influence of pleasant and unpleasant affect may occur along bipolar lines even if the sources of these feelings are understood as physiologically separable systems with distinct neurological loci.     

Stimulus generalization, context change, and forgetting

Forgetting is often attributed to retrieval failure caused by background contextual cues changing over time. However, generalization between stimuli may increase over time and make them increasingly interchangeable. If this effect occurs with contextual cues, it might cancel any effect of a changing context. The authors review the evidence and suggest a resolution of this paradox. Although generalization gradients can change over time, the effect is not always strong. Increased responding to nontarget stimuli is not often shown, and few studies have demonstrated such changes with contextual cues in a way that rules out other interpretations. Even this example of forgetting may be caused by retrieval failure. The physical contexts manipulated in learning and memory experiments themselves occur within a superordinate temporal context and can thus be forgotten with no inherent challenge to a context-change account of forgetting.