Tool use in left brain damage and Alzheimer's disease: What about function and manipulation knowledge?

Tool use disorders are usually associated with difficulties in retrieving function and manipulation knowledge. Here, we investigate tool use (Real Tool Use, RTU), function (Functional Association, FA) and manipulation knowledge (Gesture Recognition, GR) in 17 left‐brain‐damaged (LBD) patients and 14 AD patients (Alzheimer disease). LBD group exhibited predicted deficit on RTU but not on FA and GR while AD patients showed deficits on GR and FA with preserved tool use skills. These findings question the role played by function and manipulation knowledge in actual tool use.     

Mirror neurons in humans: consisting or confounding evidence?

The widely known discovery of mirror neurons in macaques shows that premotor and parietal cortical areas are not only involved in executing one's own movement, but are also active when observing the action of others. The goal of this essay is to critically evaluate the substance of functional magnetic resonance imaging (fMRI) and positron emission tomography (PET) studies whose aim has been to reveal the presence of a parallel system in humans. An inspection of this literature suggests that there is relatively weak evidence for the existence of a circuit with 'mirror' properties in humans, such as that described in monkeys.     

Growth of white matter in the adolescent brain: Myelin or axon?

White matter occupies almost half of the human brain. It contains axons connecting spatially segregated modules and, as such, it is essential for the smooth flow of information in functional networks. Structural maturation of white matter continues during adolescence, as reflected in age-related changes in its volume, as well as in its microstructure. Here I review recent observations obtained with magnetic resonance imaging in typically developing adolescents and point out some of the known variations in structural properties of white matter vis-à-vis brain function in health and disease. I conclude by re-focusing the interpretations of MR-based studies of white matter from myelin to axon.     

Are developmental disorders like cases of adult brain damage? Implications from connectionist modelling

It is often assumed that similar domain-specific behavioural impairments found in cases of adult brain damage and developmental disorders correspond to similar underlying causes, and can serve as convergent evidence for the modular structure of the normal adult cognitive system. We argue that this correspondence is contingent on an unsupported assumption that atypical development can produce selective deficits while the rest of the system develops normally (Residual Normality), and that this assumption tends to bias data collection in the field. Based on a review of connectionist models of acquired and developmental disorders in the domains of reading and past tense, as well as on new simulations, we explore the computational viability of Residual Normality and the potential role of development in producing behavioural deficits. Simulations demonstrate that damage to a developmental model can produce very different effects depending on whether it occurs prior to or following the training process. Because developmental disorders typically involve damage prior to learning, we conclude that the developmental process is a key component of the explanation of endstate impairments in such disorders. Further simulations demonstrate that in simple connectionist learning systems, the assumption of Residual Normality is undermined by processes of compensation or alteration elsewhere in the system. We outline the precise computational conditions required for Residual Normality to hold in development, and suggest that in many cases it is an unlikely hypothesis. We conclude that in developmental disorders, inferences from behavioural deficits to underlying structure crucially depend on developmental conditions, and that the process of ontogenetic development cannot be ignored in constructing models of developmental disorders.     

Real or imagined incomplete lateralization of function in females?

Visual field effects for 30 normal familial right-handed females were investigated with 4-point random forms known to be recognized more accurately in the right visual field by normal familial right-handed males, and the relationship between spatial ability and various performance patterns was examined. The forms were presented 2 deg in the left or right visual field. After a 10-sec delay, the subject decided whether or not a form exposed in central vision was the same as the stimulus. Incomplete lateralization of function appeared to be supported by the finding of no field differences. An alternative explanation was discussed since visual field superiority was significantly correlated with WAIS Block Design scores scaled for age, females with relatively low scores showing a right visual field superiority and females with relatively high scores showing a left visual field superiority. The experiment was repeated with 30 familial right-handed males. A significant right visual field superiority was obtained, but visual field superiorities were not correlated with measures of visuo-spatial or verbal ability.     

Victims' perceptions of social support: what is helpful from whom?

Although research has demonstrated that social interactions influence psychological well-being, little is known about what specific actions victims of stressful life events experience as helpful or unhelpful. Wortman and Dunkel-Schetter (1979) previously suggested that victims frequently experience rejection, withdrawal, and communication problems with those close to them. To address these issues, 55 cancer patients were interviewed concerning the specific actions they found to be helpful or unhelpful from several potential support providers: spouse, other family members, friends, acquaintances, others with cancer, physicians, and nurses. The data indicated that the Wortman and Dunkel-Schetter victimization model applied better to interactions with friends and acquaintances than to interactions with close family members. In addition, support was found to be partially dependent on the source: Particular actions were perceived to be helpful from some but not other network members. Implications for theory and research on social support are discussed.     

Champagne,beer, or coffee? A corpus of gender-related and neutral words

A list of gender-related and gender-neutral words for use in testing gender stereotyping and memory was created and evaluated. Words were rated by samples of undergraduates at universities located in the northeast, southeast, and south-central United States. A substantial list of masculine, feminine, and gender-neutral words was identified. These lists allow researchers to construct large lists of gender-associated words while being able to control for extraneous variables, such as word frequency and word length. In addition, the high reliability across the samples suggests that gender ratings are a fairly stable phenomenon. Applications for this list are discussed. The word lists presented in Tables 1–3 and the raw data analyzed in this article may be downloaded fromwww.psychonomic.org/archive/.     

Arrested development? Reconsidering dual-systems models of brain function in adolescence and disorders

The dual-systems model of a ventral affective system, whose reactivity confers risks and liabilities, and a prefrontal control system, whose regulatory capacities buffer against these vulnerabilities, is an intuitive account that pervades many fields in the cognitive neurosciences--especially in the study of populations that differ from neurotypical adults, such as adolescents or individuals with affective or impulse regulation disorders. However, recent evidence that is inconsistent with dual-systems models illustrates the complexity of developmental and clinical variations in brain function. Building new models to account for this complexity is critical to progress in these fields, and will be facilitated by research that emphasizes network-based approaches and maps relationships between structure and function, as well as brain and behavior, over time.     

Rehabilitation of executive disorders after brain injury: Are interventions effective?

In this paper, the effectiveness of interventions for executive disorders was reviewed. The objective was to evaluate the internal and external validity of intervention studies. A total of 46 papers, describing 54 studies, conducted in the last two decades meeting several preset inclusion criteria, was included in this review. The studies were categorized into three treatment approaches in order to enhance comparability. The overall results show that many interventions yield positive outcomes and seem to be effective in reducing executive problems in brain‐injured subjects. However, several studies have only an explorative intent and are based on less sophisticated experimental designs. The verification of their results is generally more tenuous. The internal validity, or the set‐up of experimental conditions necessary to draw valid conclusions about treatment effectiveness, including the choice of well‐matched control groups, or the randomization of patients over treatment and control conditions, is not always strong. The same conclusion can be drawn for the external validity of a number of the intervention studies; often evidence of generalization to real‐life situations, long‐term follow‐up, and transfer to non‐trained situations, were (partially) lacking in the studies under review. The authors are aware that the design of proper randomized controlled trials for the investigation of the treatment effectiveness of executive disorders is cumbersome and time consuming. Nonetheless, the provisional results of several well‐designed studies described in this review make the effort worthwhile.     

Externality as a function of obesity in children: pervasive style or eating-specific attribute?

The developmental sources of the link between stylistic externality and food-related externality found in the obese by Schacter and others were explored by testing whether the externality phenomena that have been found to differentiate obese and normal adults are also discriminators of obese and normal children. The results suggest that obese children as young as 7-12 years of age show an external responsiveness to salient food cues but not yet a generally external perceptual style. The implications of these findings for the development of obese externality are examined.     

Champagne, beer, or coffee? A corpus of gender-related and neutral words.

A list of gender-related and gender-neutral words for use in testing gender stereotyping and memory was created and evaluated. Words were rated by samples of undergraduates at universities located in the northeast, southeast, and south-central United States. A substantial list of masculine, feminine, and gender-neutral words was identified. These lists allow researchers to construct large lists of gender-associated words while being able to control for extraneous variables, such as word frequency and word length. In addition, the high reliability across the samples suggests that gender ratings are a fairly stable phenomenon. Applications for this list are discussed. The word lists presented in Tables 1-3 and the raw data analyzed in this article may be downloaded from www.psychonomic.org/archive/.     

Mega-evolutions in medical education: Helpful or harmful to higher cognitive skill development?

Medicine is practiced in environments of volatility, uncertainty, complexity, ambiguity, and disruption (VUCAD). Medical educators are tasked with providing an education that prepares graduates to successfully practice medicine in those types of environments. While medical education is continually evolving to incorporate new content and educational approaches, there are two mega-evolutions that have permeated medical education: increased curricular structure and content integration. Structure and integration are assumed to be positive changes; however, they may alter the development of higher cognitive skills such as information management, planning, breadth of approach, strategy, and initiative. As new graduates will practice in VUCAD environments, it seems prudent to consider the effects of medical education’s mega-evolutions on the development of higher cognitive skills critical to those types of environments. This paper explores the potential consequences of the increased curricular structure and content integration in medical education for learners who will practice in VUCAD environments and proposes a research agenda to better understand the relationship between curricular structure and integration and higher cognitive skill development.     

Hyperstriatal function in the pigeon: response inhibition or response shift?

Experiment 1 showed that pigeons with lesions of the anterior or posterior hyperstriatum were impaired relative to unoperated controls and to control operates having neostriatal lesions on both acquisition and reversal of a simultaneous position discrimination. The observation that hyperstriatal birds showed more tendency than controls to halt responding altogether in this situation cast doubt on the notion that the reversal deficit was due to a loss of response inhibition. A second experiment supported an alternative hypothesis, that hyperstriatal birds have a deficit in the ability to shift responding to an alternative stimulus as a consequence of nonreinforcement.     

Stressful demands or helpful guidance? The role of display rules in Indian call centers

This paper utilizes conservation of resources (COR) theory and two of Hofstede's (1980) dimensions of culture (individualism and power distance) to examine the impact of display rules on job satisfaction and performance in an Indian call center sample. Contrary to findings in an American sample (Wilk & Moynihan, 2005), we proposed that due to cultural differences as well as differences in the nature of the job among representatives in an Indian call center, supervisory focus on display rules would reduce emotional exhaustion, and in turn, have positive consequences for employee performance and job satisfaction. Using multi-source data in a sample of 137 Indian call center representatives, results confirmed the hypothesized mediating effects of emotional exhaustion on performance and job satisfaction. Implications of these results for future cross-cultural research are presented.     

Grammatical structure and recall: A function of the space in immediate memory or of recall delay?

Savin and Perchonock suggest that when a sentence and additional unrelated words are presented for immediate recall, the number of words recalled in addition to that sentence represents the space left over in a limited memory store after the sentence and its transformational tag have been stored. They report error data and word-recall data in support of a transformational model of sentence processing. In two replications of that study, error data failed to support the transformational model. Furthermore, the word-recall data could be attributed to differential word-recall delays-the more complex the sentence, the longer the delay between word presentation and word recall. These findings, as well as others in the literature. fail to support a transformational interpretation of sentence processing.     

Educating both halves of the brain: Educational breakthrough or neuromythology?

The increasing popularity of the idea that the two hemispheres of the human cerebral cortex carry on different modes of thinking has resulted in an accelerating social and commercial pressure to organize school curricula, teaching, and testing to conform to a right brain-left brain dichotomy. Evidence gathered from commissurotomy (split-brain) patients and right hemisphere studies on normal intact humans is reviewed and evaluated. Conclusions from this review are (a) the commissurotomy patients are not a suitable group on which to base generalizations about cortical functioning in the normal intact human; (b) the right-left hemisphere differences reported in many experiments on normal subjects are small and can be found only in an extremely narrow experimental context; and (c) there is no scientific basis in this work for any reorganization of curricular, teaching, or testing programs within contemporary educational practice.     

Empirically distinguishing interpersonal styles within romantic relationships: What is helpful or harmful when having a goal for your romantic partner?

IntroductionRelationship research rooted in self-determination theory often focuses on autonomy support. However, rarely is this interpersonal style considered alongside other facets of relational behaviours such as directive support and control.ObjectiveThe present study aimed to distinguish the three styles by providing a tool that can simultaneously assess them.MethodA total sample of 710 French Canadians involved in a romantic relationship was used for factor extraction and test of dimensionality as well as reliability. Predictive validity was tested using multiple linear regressions with six outcomes: well-being, relationship quality, closeness, goal progress, cooperation and conflicts.ResultsResults suggested three distinct interpersonal styles, each of which showing a different pattern of prediction with the outcomes. Overall, autonomy support was associated with positive outcomes, whereas control was associated with negative outcomes. As for directive support, the global pattern was between the two others.ConclusionThe present research offers a scale which simultaneously assesses and distinguishes the autonomy-supportive, directive-supportive and controlling styles in a romantic relationship context using three items each. By examining the associations between these three interpersonal styles and various outcomes four months later, this study sheds light on helpful and harmful behaviours in relation to the goals people have for their romantic partner.