Organizational features of a young child's behaviors

The study was designed to investigate the nature of response-class phenomena and the possibility of indirect contingency control. A single subject was employed. Prior to the start of the study, the experimenter established the process of maintaining stimulus constancy during a preexperimental phase. Subsequent to the first baseline phase, a factor analysis was done to define the response class and the behavior categories constituting the class. Manipulating a single adult consequence to a response-class category over subsequent baseline and manipulation phases revealed frequency changes in all behavior categories in the response class. The data gave support to indirect behavior control. Search for possible explanations of frequency changes showed that the direction of the frequency changes were predictable from the results of the factor analysis.     

Cognitive efficiency modes in old age: performance on sequential and coordinative verbal and visuospatial tasks

In an experiment using a large set of verbal and spatial tasks requiring low or high degrees of executive control, 3 distinct age-related effects were found. The smallest effect (no slowing) was tied to lexical tasks with low executive involvement, the largest deficit (age-related slowing factor of 2.2) was tied to visuospatial tasks with high executive involvement, an intermediate level of deficit (slowing factor of 1.7) was found for visuospatial tasks with low executive load and verbal tasks with high executive load. These age-related dissociations were incompatible with any "common cause" formulation. The mechanism responsible for the dissociation between verbal and visual tasks, and between low and high executive load remains to be determined. The latter may reflect capacity limits.     

Topiramate attenuates a transient learning deficit after lesions inducing intracerebral hemorrhage

28 male Long-Evans rats prepared with lesions of the middle cerebral artery displayed deficits in spatial navigational learning in a simple version of the Morris Water Maze task not seen in animals prepared with the same injury but administered 4 treatments with topiramate after surgery.     

Better the DVL you know: acronyms reveal the contribution of familiarity to single-word reading

Current theories of reading are divided between dual-route accounts, which propose that separable processes subserve word recognition for orthographically regular and irregular strings, and connectionist models, which propose a single mechanism mapping form to meaning. These theories make distinct predictions about the processing of acronyms, which can be orthographically illegal and yet familiar, as compared with the processing of pseudowords, which are regular but unfamiliar. This study examined whether acronyms are processed like pseudowords and words. Event-related potentials (ERPs) were recorded as subjects viewed familiar and unfamiliar acronyms, words, pseudowords, illegal strings, and--as the targets of the substantive behavioral task--proper names. Familiar acronyms elicited repetition effects on the N400 component, a functionally specific index of semantic activation processes; repetition effects for familiar acronyms were similar in magnitude, timing, and scalp distribution to those for words and pseudowords. The similarity of the brain response to familiar--but--illegal and unfamiliar--but--legal classes of stimuli is inconsistent with predictions of dual-route models of reading.     

The acronym superiority effect

The visual world is replete with noisy, continuous, perceptually variant linguistic information, which fluent readers rapidly translate from percept to meaning. What are the properties the language comprehension system uses as cues to initiate lexical/semantic access in response to some, but not all, orthographic strings? In the behavioral, electromagnetic, and neuropsychological literatures, orthographic regularity and familiarity have been identified as critical factors. Here, we present a study in the Reicher—Wheeler tradition that manipulates these two properties independently through the use of four stimulus categories: familiar and orthographically regular words, unfamiliar but regular pseudowords, unfamiliar illegal strings, and familiar but orthographically illegal acronyms. We find that, like letters in words and pseudowords, letters in acronyms enjoy an identification benefit relative to similarly illegal, but unfamiliar strings. This supports theories of visual word recognition in which familiarity, rather than orthographic regularity, plays a critical role in gating processing.     

Measuring Stigma Toward Mental Illness: Development and Application of the Mental Illness Stigma Scale1

Guided by theory on stigma, a Likert‐type scale was developed to measure 7 factors of attitudes toward people with mental illness: interpersonal anxiety, relationship disruption, poor hygiene, visibility, treatability, professional efficacy, and recovery. The scale was validated among college students and community members, measuring attitudes toward people with mental illness, depression, bipolar disorder, and schizophrenia. In a second application, college students completed the scale from their own perspective, then from an imagined perspective of someone with mental illness, while psychiatric patients completed the scale from their own perspective, then from an imagined viewpoint of someone without mental illness. Psychiatric patients assumed that they were stigmatized to a greater extent than was admitted by the student sample.     

The health belief model and adolescents with insulin-dependent diabetes mellitus.

We tested the predictive utility of the health belief model (HBM) for adherence with a complex, ongoing medical regimen in the context of a chronically ill youthful population (56 adolescent outpatients with insulin-dependent diabetes mellitus; mean age = 14 years). A three-construct model of health beliefs was tested: Threat (perceived susceptibility combined with severity), Benefits-Costs, and Cues to seek treatment. Multiple indicators of compliance were used, and metabolic control was measured by glycosylated hemoglobin. The Benefits-Costs and Cues constructs were related to compliance in the theoretically expected positive direction. Threat interacted with Benefits-Costs in the prediction of compliance and with Cues in the prediction of metabolic control. The greatest compliance was achieved with low perceived Threat and high perceived Benefits-Costs. Poor metabolic control was associated with high Threat and Cues. As age increased, adherence to the exercise, injection, and frequency components of the regimen decreased.     

Adolescents let sufficient evidence accumulate before making a decision when large incentives are at stake

Adolescent decision‐making has been described as impulsive and suboptimal in the presence of incentives. In this study we examined the neural substrates of adolescent decision‐making using a perceptual discrimination task for which small and large rewards were associated with correctly detecting the direction of motion of a cloud of moving dots. Adults showed a reward bias of faster reaction times on trials for which the direction of motion was associated with a large reward. Adolescents, in contrast, were slower to make decisions on trials associated with large rewards. This behavioral pattern in adolescents was paralleled by greater recruitment of fronto‐parietal regions important in representing the accumulation of evidence sufficient for selecting one choice over its alternative and the certainty of that choice. The findings suggest that when large incentives are dependent on performance, adolescents may require more evidence to accumulate prior to responding, to be certain to maximize their gains. Adults, in contrast, appear to be quicker in evaluating the evidence for a decision when primed by rewards. Overall these findings suggest that rather than reacting hastily, adolescents can be incentivized to take more time to make decisions when large rewards are at stake. A video abstract of this article can be viewed at http://youtu.be/1g4F5vzFDl0