Factors affecting processing mode in visual search

Visual search was studied under a variety of conditions to clarify some differences among the results of previous investigations and to provide a testing ground for models of visual information processing. Display configuration, target and field composition, exposure duration, and display size (up to 16 elements) were among the parameters investigated. In some conditions, mean reaction time was essentially invariant with display size, while in other conditions it increased substantially and linearly with display size. Current models of visual information processing were evaluated in the light of these and previous findings; all were found wanting. The data seem to demand a system subject to flexible cognitive control processes.     

Cognitive costs of encoding novel natural activities: Can “learning by doing” be distracting and deceptive?

Findings from action memory research suggest that the enactment of simple actions and naturalistic activities results in similar memory performance to that from their observation. However, little is known about potential differences between the conditions during the encoding of the to-be-studied actions and activities. We analysed the cognitive costs of encoding two novel naturalistic activities studied via enactment or via observation in four experiments. In addition to memory performance, we measured objective cognitive costs with a secondary task and subjective cognitive costs with repeated ratings of mental effort and estimates of general activity difficulty. Memory performance was comparable across study conditions throughout all experiments. The enactment of activities repeatedly resulted in slower reaction times in the secondary task than did observation, suggesting higher objective costs. In contrast, subjective costs were rated lower after enactment than after observation. Findings from a pantomimic enactment condition suggested that the low ratings of subjective costs after enactment represent a misinterpretation of task demands. Our findings imply that the widespread belief about “learning by doing” as an easy way of learning does not stem from an actual advantage in memory performance, but rather from continuous feedback about one's performance resulting from enactment.     

The vocabulary spurt predicts the emergence of backward semantic inhibition in 18‐month‐old toddlers

The current study examines the relationship between 18‐month‐old toddlers’ vocabulary size and their ability to inhibit attention to no‐longer relevant information using the backward semantic inhibition paradigm. When adults switch attention from one semantic category to another, the former and no‐longer‐relevant semantic category becomes inhibited, and subsequent attention to an item that belongs to the inhibited semantic category is impaired. Here we demonstrate that 18‐month‐olds can inhibit attention to no‐longer relevant semantic categories, but only if they have a relatively large vocabulary. These findings suggest that an increased number of items (word knowledge) in the toddler lexical‐semantic system during the “vocabulary spurt” at 18‐months may be an important driving force behind the emergence of a semantic inhibitory mechanism. Possessing more words in the mental lexicon likely results in the formation of inhibitory links between words, which allow toddlers to select and deselect words and concepts more efficiently. Our findings highlight the role of vocabulary growth in the development of inhibitory processes in the emerging lexical‐semantic system.     

Linking empirically based theory and evaluation: The family bereavement program

Conclusion We have illustrated how our small theory (Lipsey, 1990) of bereavement guided the development and evaluation of a preventive intervention for bereaved children. Our small theory, based on prior empirical research, enabled us to identify family processes that appeared to mediate the effects of parental death on child mental health. Our intervention was designed to attempt to change these processes. The evaluation of our experimental trial of the intervention assessed changes on these processes as well as the more distal mental health outcomes. The experimental trial showed some-what encouraging results, in terms of the program's ability to modify the warmth of the parent–child relationship and to decrease symptomatology in the adolescent children. We also obtained further empirical support for our underlying theoretical model. Finally, implications for redesign of the program were derived from assessing the adequacy of the program components to change each of the mediators in the theoretical model.Support for this research was provided by NIMH grant P5OMH39246 which is gratefully acknowledged. David R. Pillow is now at Western Psychiatric Institute, Pittsburgh; Fred Rogosch is at the University of Rochester; Janette Beals is now at University of Colorado Health Sciences Center; Kim D. Reynolds is now at the University of Alabama, Birmingham; Carl Kallgren is now at the Pennsylvania State University, at Erie; and Rafael Ramirez is now at the University of Puerto Rico.     

Arbitration: Semi-judicial process or negotiation?

Arbitration is usually described as a semi-judicial, evaluative process, where the parties to a dispute surrender their responsibility for its resolution to a disinterested third party. The arbitrator is expected to listen impartially to the arguments of both sides and, on the basis of the evidence put forward, decide the issue between them. This paper questions the validity of the typical image of arbitration and suggests that a more comprehensive understanding can be developed if it is viewed in the context of different models of negotiation. It is argued that the arbitrator is likely to have at least two contrasting roles: (1) that of manager of the process of concession-convergence, when the issues in dispute are relatively straightforward; and (2) that of joint negotiator with the parties, constructing a framework for a future detailed resolution of the dispute, when the issues are more complex. The parties, on the other hand, are likely to be differentiated according to their previous experience of arbitration. While the more experienced participants may be able to make skilful strategic use of the procedures, the inexperienced are likely to be adversely affected by the evaluative/judicial public image of arbitration.     

The Structure of Problem and Positive Behavior Among American Indian Adolescents: Gender and Community Differences

Using Problem-Behavior Theory as a framework, the latent structure of problem and positive behaviors was examined within a sample of 1,894 American Indian adolescents. Support was found for a two-factor second-order structure in which problem behaviors (antisocial behavior, alcohol use, drug use, and risky sexual behavior) and positive behaviors (school success, cultural activities, competencies, and community-mindedness) represented two relatively uncorrelated aspects of behavior. Hierarchical multiple regressions demonstrated that the positive behaviors construct contributed significant incremental construct validity in the statistical prediction of psychosocial outcomes, over and above the problem behaviors. In addition, the fit of the structure was examined across gender and the four participating communities. The importance of the inclusion of positive behaviors is discussed from the standpoint of both prevention/promotion activities and the communities' perceptions. Further recommendations are made for deeper understandings of community concerns and strengths in conducting preventive/promotive research efforts.     

Visibility of an afterimage alone and in the presence of,one or two additional afterimages

The total time for which a circular afterimage is visible has been found to be increased by the presence of one or two additional afterimages. This increased’ visibility, which has been called “facilitation, ” is greater the nearer the afterimages are to one another, being optimum at .25 deg and declining to zero at 2.0 deg separation.     

The effect of size,retinal locus,and orientation on the visibility of a single afterimage

Unitary and fragmentary visibilities of the afterimage of a small rectangular bar were measured at three retinal loci. Unitary visibility was higher for fovea] than for parafoveal viewing, whereas fragmentation was greater the longer the bar. A model for estimating the size of receptors has been applied and gives the mean size of a “functional unit” to be 1.5 deg in the fovea and 3–4 deg parafoveally. Unitary visibility has been shown to be higher for vertical and horizontal bars than for obliquely oriented bars. Explanations for this result have been suggested in terms of the distribution, size, and selectivity of cortical orientation selective units.     

Tracing enhances problem-solving transfer,but without effects on intrinsic or extraneous cognitive load

People can make pointing gestures and tracing actions with the index finger with little or no conscious effort. From the perspective of cognitive load theory, such “biologically primary” gestures and actions might help people learn “biologically secondary” concepts and skills requiring extended cognitive effort, such as reading, science, or mathematics. Studies on tracing or tracing and pointing have yielded mixed findings regarding hypothesized effects on intrinsic and extraneous cognitive load. The present study investigated whether computer-based instructions to trace elements of worked examples on angle relationships would affect school students' (N = 106) self-reports of intrinsic and extraneous cognitive load, as well as problem-solving transfer test performance. The tracing effect on transfer posttests seen in prior studies was replicated, but cognitive load hypotheses were not supported. Implications for educational practice and future research are discussed.     

Spirituality and mental health status among Northern Plain tribes

Spirituality measures often show positive associations with preferred mental health outcomes in the general population; however, research among American Indians (AIs) is limited. We examined the relationships of mental health status and two measures of spirituality – the Midlife Development Inventory (MIDI) and a tribal cultural spirituality measure – in Northern Plains AIs, aged 15–54 (n?=?1636). While the MIDI was unassociated with mental health status, the tribal cultural spirituality measure showed a significant relationship with better mental health status. Mental health conditions disproportionately affect AIs. Understanding protective factors such as cultural spirituality that can mitigate mental health disorders is critical to reducing these health disparities.