An fMRI investigation of a novel analogue to the Trail-Making Test

The Trail-Making Test (TMT) is a widely used neuropsychological measure that assesses visuomotor abilities and cognitive flexibility. For the TMT-A condition participants are required to locate and connect numbers (i.e. 1-2-3…) while in the TMT-B condition participants perform the set-shifting task of locating and connecting numbers and letters (i.e. 1-A-2-B…). The TMT-B condition has shown impairments in many clinical populations, particularly schizophrenia patients, but the neurobiological underpinning of the task can be difficult to discern given pragmatic obstacles in adapting the task for neuroimaging. In a behavioural testing experiment we demonstrated a close correspondence between performance on the standard TMT and a novel, computer programmed adaptation of the TMT (pcTMT). The pcTMT was designed for functional magnetic resonance imaging (fMRI) administration and neuroimaging data for this task were obtained in. A whole brain analysis revealed significantly greater activation during the pcTMT-B relative to the pcTMT-A in right inferior/middle frontal cortices, right precentral gyrus, left angular gyrus/left middle temporal gyrus. These results identify the regions that most likely underlie cognitive flexibility during the TMT and are candidate regions underlying the impairment of groups with poor set-shifting abilities.     

Wittgenstein and Brouwer

In this paper, I present a summary of the philosophical relationship betweenWittgenstein and Brouwer, taking as my point of departure Brouwer's lecture onMarch 10, 1928 in Vienna. I argue that Wittgenstein having at that stage not doneserious philosophical work for years, if one is to understand the impact of thatlecture on him, it is better to compare its content with the remarks on logics andmathematics in the Tractactus. I thus show that Wittgenstein's position, in theTractactus, was already quite close to Brouwer's and that the points of divergence are the basis to Wittgenstein's later criticisms of intuitionism. Among the topics of comparison are the role of intuition in mathematics, rule following, choice sequences, the Law of Excluded Middle, and the primacy of arithmetic over logic.     

Anterior but not intralaminar thalamic nuclei support allocentric spatial memory

Medial thalamic damage is a common cause of severe memory disruption in humans. Both the anterior thalamic nuclei (ATN) and the intralaminar thalamic nuclei (ILN) have been suggested as primary sites of diencephalic injury underlying learning and memory deficits, but their respective roles have yet to be resolved. The present study explicitly compared two spatial memory tasks in male PVGc hooded rats with selective neurotoxic lesions to either (1) the ATN or (2) the rostral ILN (and adjacent lateral mediodorsal thalamic nuclei; ILN/LT lesions). As predicted, the ATN group, but not the ILN/LT group, exhibited clear deficits in the Morris water maze task for the initial acquisition of a fixed hidden platform and its reversal to a new position. The second task examined acquisition of egocentric spatial reference memory for a left or right body turn, using any three arms in an 8-arm water maze on any given trial; contrary to predictions, both lesion groups performed as well as the Sham group. The lack of deficits in ILN/LT rats on this second task contrasted with previous findings reporting a detrimental effect of ILN/LT lesions on egocentric working memory. The clear dissociation between the influence of ATN and ILN/LT lesions with respect to allocentric spatial reference memory in the Morris maze emphasizes that caution is required when interpreting the effects of non-ATN thalamic lesions on spatial memory when the lesions encroach substantial areas of the adjacent ATN region.     

Memory for Angry Faces,Impulsivity, and Problematic Behavior in Adolescence

Research has shown that cognitive processes like the attribution of hostile intention or angry emotion to others contribute to the development and maintenance of conduct problems. However, the role of memory has been understudied in comparison with attribution biases. The aim of this study was thus to test if a memory bias for angry faces was related to conduct problems in youth. Adolescents from a junior secondary school were presented with angry and happy faces and were later asked to recognize the same faces with a neutral expression. They also completed an impulsivity questionnaire. A teacher assessed their behavior. The results showed that a better recognition of angry faces than happy faces predicted conduct problems and hyperactivity/inattention as reported by the teacher. The memory bias effect was more pronounced for impulsive adolescents. It is suggested that a memory bias for angry faces favors disruptive behavior but that a good ability to control impulses may moderate the negative impact of this bias.     

Personality and job satisfaction: The role of narcissism

Narcissism has been studied in relation to leadership and productivity in the workplace. However, few studies have been conducted on how narcissism influences work attitudes. The first goal of this study is to measure the association between narcissism and the five factor model (FFM) of personality in an organizational sample. The second goal is to measure the influence of narcissism on job satisfaction when controlling for FFM traits. A total of 224 employees from a public organization have filled out self-rating measures of job satisfaction, FFM traits and a measure of narcissism. Results indicated that narcissism was positively correlated with FFM extraversion and openness to experience and negatively correlated with agreeableness. Narcissism had a significant influence on job satisfaction, even when controlling for FFM traits. We believe that these results stress the importance of better understanding the role of narcissism in employee attitudes in order to weigh the pros and cons of hiring or promoting narcissistic employees.     

Investigation of effects of face rotation on race processing: An ERPs study

Recent ERP research has indicated that the processing of faces of other races (OR) and same race (SR) as the perceiver differs at the perceptual level, more precisely for the N170 component. The purpose of the present study was to continue the investigation of the race-of-face processing across multiple orientations. Event-related brain potentials (ERPs) and performance were recorded when Caucasian participants were required to categorize by race Caucasian and African faces presented in eight different angles of orientation. Three main observations were made: (1) the face-sensitive N170 is modulated by the race of faces, being larger in response to OR compared to SR faces; (2) face rotation affected this component in the same pattern for both racial groups; (3) the N170-ORE progressively disappeared as the faces moved away from their canonical orientation at the right hemisphere only. Thus, the current findings suggest that configural/holisitic information is extracted from faces of both racial groups, but that upright OR faces require increased demands.     

A Multilevel Investigation of the Influences of Employees' Resistance to Empowerment

We employed a multilevel research design to examine the effects of employees' resistance to empowerment. Survey responses were obtained from 637 customer service engineers who worked in 121 empowered teams. At the team level of analysis, resistance to empowerment climate related negatively to customer satisfaction as mediated by transition processes. In addition, resistance to empowerment climate evidenced an indirect relation with team performance via team action processes. At the individual level of analysis, employees' resistance to empowerment related negatively to their job satisfaction. Moreover, a cross-level relation was evidenced whereby team-level resistance to empowerment climate related negatively to job satisfaction, beyond that accounted for by the individual-level effects, as partially mediated by team interpersonal processes. Results are discussed in terms of the multilevel manner in which employees' resistance to empowerment can undermine organizational design changes.     

The influence of contour fragmentation on recognition memory: an event-related potential study

The present study was carried out to examine how the event-related potentials to fragmentation predict recognition success. Stimuli were abstract meaningless figures that were either complete or fragmented to various extents but still recoverable. Stimuli were first encoded as part of a symmetry discrimination task. In a subsequent recognition phase, encoded stimuli were presented complete along with never presented stimuli and participants performed an old/new discrimination task. Fragmentation stimuli elicited more negative ERPs than complete figures over the frontal, central and parietal areas between 180 and 260 ms, and over the occipito-temporal areas between 220 and 340 ms. Only this latter effect was modulated as a function of whether stimuli were recognized or not during the recognition phase of the memory test. More specifically, the effect occurred for stimuli that were later forgotten and was absent for stimuli that were later recognized. This ERP to fragmentation, the occipito-temporal N(frag), possibly reflects the brain response to encoding difficulty, and is thus predictive of recognition performance.     

Ventromedial prefrontal-subcortical systems and the generation of affective meaning

The ventromedial prefrontal cortex (vmPFC) comprises a set of interconnected regions that integrate information from affective sensory and social cues, long-term memory, and representations of the 'self'. Alhough the vmPFC is implicated in a variety of seemingly disparate processes, these processes are organized around a common theme. The vmPFC is not necessary for affective responses per se, but is critical when affective responses are shaped by conceptual information about specific outcomes. The vmPFC thus functions as a hub that links concepts with brainstem systems capable of coordinating organism-wide emotional behavior, a process we describe in terms of the generation of affective meaning, and which could explain the common role played by the vmPFC in a range of experimental paradigms.     

Antecedents and Outcomes of Informal Learning Behaviors: a Meta-Analysis

Purpose

Over the past two decades, research has shown a growing consensus that 70% to 90% of organizational learning occurs not through formal training but informally, on-the-job, and in an ongoing manner. Despite this emerging consensus, primary data on the nature and correlates of informal learning remains sparse. The purpose of this study was to provide an integrative definition of informal learning behaviors (ILBs) and to synthesize existing primary data through meta-analysis to explore ILB correlates.

Design/Methodology/Approach

Given that there has been little systematic treatment of ILBs, we defined their construct domain and tested relationships suggested by our research questions with antecedents (personal factors, situational factors) and outcomes (attitudes, knowledge/skill acquisition, performance) using random effects meta-analyses (k = 49, N = 55,514).

Findings

Our results showed both personal and situational antecedent factors to be predictive of ILBs, as well as ILB–outcome relationships.

Implications

Findings indicate that engagement in ILBs for working adults is linked to valued criteria such as attitudes (ρ = .29), knowledge/skill acquisition (ρ = .41), and performance (ρ = .42). We provide suggestions for future research and actionable advice for organizations to support the development of ILBs.

Originality/Value

Although hundreds of studies and over a dozen meta-analyses have explored the nature and effectiveness of formal learning in the workplace, our work is the first attempt to conceptualize a unified definition of ILBs and to aggregate primary data on ILB correlates using meta-analysis.