Queuing or sharing? A critical evaluation of the single-bottleneck notion

The model of a single central bottleneck for human information processing is critically examined. Most evidence cited in support of the model has been observed within the overlapping tasks paradigm. It is shown here that most findings obtained within that paradigm and that were used to support the model are also consistent with a simple resource model. The most prominent findings are the millisecond-for-millisecond slope at the left of the RT2-SOA curve, the high RT1-RT2 correlation, the additivity of the effects on RT2 of SOA and of the difficulty of selecting R2, and the washout of the effect of S2 discriminability on RT2 in a dual-task condition. In addition, the asymmetry of the effects of the dual-task requirement on RT1 and RT2 can be accounted for by the resource model provided that it assumes uneven allocation of resources, which is quite reasonable in view of the task asymmetry inherent in the demand characteristics of the paradigm. The same is true for two other findings that appear to support the single-bottleneck model-that in the dual-task condition, the demand of the first task affects equally RT1 and RT2 and that its effect on RT1 is the same as the corresponding effect in the single-task condition. Furthermore, the single-bottleneck model is hard to reconcile with a negative slope at the left of the RT1-SOA curve or a positive slope at the left of the IRI-SOA curve, unless augmented by ancillary assumptions that are yet to be substantiated. Representative data were fit by each of the models using its optimal set of parameters. Both models achieved quite good degrees of fit. It is further argued that since the overlapping tasks paradigm is heavily biased in favor of a speedy reaction to the stimulus that appears first, it is nonoptimal for testing the central bottleneck model. Finally, the bottleneck model is examined in terms of other scientific criteria.     

Young adult outcome of children with "situational" hyperactivity: a prospective,controlled follow-up study

To examine the importance of symptom pervasiveness in ADHD, we conducted a prospective, 12-year follow-up study of boys (ages 6–12) considered hyperactive at school and home (Pervasive ADHD), boys considered hyperactive by teachers but not parents (School Only ADHD), boys considered hyperactive by parents but not teachers (Home Only ADHD), and nonhyperactive comparisons. Follow-up was completed on 82–94% participants. Clinicians interviewed participants and their parents, blind to childhood status. At follow-up, antisocial disorder was significantly more prevalent among Pervasive and School Only ADHD (29% for both) than Home Only ADHD (0%) and comparisons (8%). In a similar manner, severity of behavioral problems distinguished groups (Pervasive, School > Home, comparisons), as did educational attainment and academic performance (poorest for Pervasive and School). These findings stress the validity of teacher reports in the diagnosis of ADHD.     

Differential outcome effect in the horse

Three horses were trained with a discrimination task in which the color (blue or yellow) of a center panel signaled the correct (left or right) response (lever press). Reinforcing outcomes for the two correct color-position combinations (blue-left and yellow-right) were varied across phases. Discrimination performance was better when the combinations were differentially reinforced by two types of food (chopped carrot pieces and a solid food pellet) than when the combinations were randomly reinforced by these outcomes or when there was a common reinforcer for each of the correct combinations. However, the discrimination performance established by the differential outcome procedure was still 80% to 90% correct, and an analysis of two-trial sequences revealed that the stimulus color of the preceding trial interfered with discrimination performance on a given trial. Our demonstration of the differential outcome effect in the horse and its further analysis might contribute to more efficient control of equine behavior in the laboratory as well as in horse sports.     

Group Psychotherapy Research: Current Status and Future Trends on the Dawn of the New Millennium

For the past two decades, the group psychotherapy research literature has been dominated by the efficacy study. Over this period of time, this laboratory-based work has acquired a number of methodological requisites all aimed at maximizing its internal validity in order that causal inferences can be made with increasing confidence. These very refinements in methodology, however, have led to increasing criticisms regarding the meaningfulness and relevance of the findings to real-world settings. This paper briefly reviews these developments and offers predictions, gleaned from the current literature, about future directions of research. In particular, three areas are highlighted: (1) the development of effectiveness studies, (2) the greater sophistication of process research, and (3) a renewal of the very early interest in group therapy treatment of medical conditions.     

Improving day-treatment services for adults with severe disabilities: a norm-referenced application of outcome management

We evaluated an outcome management program for working with staff to improve the performance of adults with severe disabilities in a congregate day-treatment setting. Initially, observations were conducted of student task involvement and staff distribution of teaching interactions across students in four program sites. Using recent normative data to establish objective goals for student performance, management intervention was warranted in two of the sites. A six-step outcome management program was then implemented in the two sites. The program involved defining desired student and staff outcomes, systematic monitoring of the outcomes, staff training, and supportive and corrective feedback. The outcome management program was accompanied by increases in student on-task behavior and staff distribution of teaching interactions in both sites. The increases brought the levels of on-task behavior above the normative average; on-task behavior was maintained above the baseline average for over 1 year in both sites. These results are discussed in terms of the benefits of relying on normative data for objectively evaluating and improving service delivery systems. Discussion of future research needs focuses on applying the outcome management program to other settings and services for people with disabilities.     

Equivalence classification by California sea lions using class-specific reinforcers

The ability to group dissimilar stimuli into categories on the basis of common stimulus relations (stimulus equivalence) or common functional relations (functional equivalence) has been convincingly demonstrated in verbally competent subjects. However, there are investigations with verbally limited humans and with nonhuman animals that suggest that the formation and use of classification schemes based on equivalence does not depend on linguistic skills. The present investigation documented the ability of two California sea lions to classify stimuli into functional classes using a simple discrimination reversal procedure. Following the formation of functional classes in this context, the second experiment showed transfer of the relations that emerged between class members to a matching-to-sample procedure. The third experiment demonstrated that the functional classes could be expanded through traditionally defined equivalence relations. In these three experiments, appropriate within-class responding produced class-specific food reinforcers. Experiment 3 addressed the role of these reinforcers in equivalence classification and showed that the class-specific reinforcers were sufficient to relate new stimuli to the functional classes. These findings show that sea lions can form equivalence classes in simple and conditional discrimination procedures, and that class-specific reinforcers can become equivalence class members.     

Harming is more intentional than helping because it is more probable: the underlying influence of probability on the Knobe effect

Knobe [2003. Intentional action and side effects in ordinary language. Analysis, 63, 190–194] demonstrated that people’s intentionality judgments in side effects depend on the outcome of the side-effect, indicating that people’s judgments of intentionality of action depend on not only the intention of the actor but also on the result of the action. However, on the basis of findings in judgment and decision making, the current study proposes another hypothesis to Knobe’s (2003) results: the participants’ intentionality judgments are related to not only the outcomes themselves but also the probabilities of outcomes predicted from the action. To test this hypothesis, the present study employed an identical experimental procedure to Knobe (2003), except that it required not only intentionality but also probability judgments for outcomes that resulted from the actions of a company president. The results replicated the findings of Knobe (2003) and showed a relationship between probability and intentionality judgment.     

A mixed-model for psychoanalytic education*

Abstract

If psychoanalysis is to avoid total marginalization, something has to be changed in the way future generations are prepared for working with patients and doing research. Reformation of psychoanalytic education may easily be the crucial issue when it comes to the survival of psychoanalysis. Its current organizational scheme has been criticized for various reasons, and various models of its structure have been proposed. I advocate a model that would combine the best features of the university education (training in clinical skills together with philosophy of science and research methodology) with personal analysis as part of psychoanalytic institutes. Although universities can remedy some of the problems of psychoanalytic institutions, they cannot contain the subjective experience of being analyzed.