Editorial Introduction

I survey some important semantical and axiomatic theories of self-referential truth. Kripke's fixed-point theory, the revision theory of truth and appraoches involving fuzzy logic are the main examples of semantical theories. I look at axiomatic theories devised by Cantini, Feferman, Freidman and Sheard. Finally some applications of the theory of self-referential truth are considered.     

Psychophysiological effects of emotional display rules and the moderating role of trait anger in a simulated call center

In customer interactions, emotional display rules typically prescribe service providers to suppress negative emotions and display positive ones. This study investigated the causal impact of these emotional display rules on physiological indicators of workers' stress and performance. Additionally, the moderating influence of personality was examined by analyzing the impact of trait anger. In a simulated call center, 82 females were confronted with a complaining customer and instructed to react either authentically and show their true emotions or to "serve with a smile" and hide negative emotions. Increases in diastolic blood pressure and heart rates were higher in the smile condition, while verbal fluency was lower. Trait anger moderated the effects on diastolic blood pressure and observer ratings' of participants' professional competence, suggesting more negative effects for high trait anger individuals. Findings imply that emotional display rules may increase call center employees' strain and that considering employees' personality may be crucial for precluding health and performance impairments among call center workers.     

The futility of explicit knowledge of a sequence of tasks

In an experiment that combined the task-shifting methodology with a serial reaction-time task, three groups of participants had to shift among a set of four tasks that were arranged in regular sequences of length eight. Two groups of participants were given explicit knowledge about the sequence of tasks. To ensure that the knowledge of the sequence was referred to in each trial, one group was asked to verbalise the forthcoming task (verbalisation group), whereas the other group had to detect trials that deviated from the learned sequence (detection group). Participants of a control group were given no information about the sequence of tasks. In addition, for all experimental groups in half of the blocks of trials external precues were presented which indicated the forthcoming task. The control group exhibited substantial task-shifting costs that were greatly reduced by the presentation of precues. Participants of the explicit-knowledge groups showed no indication that explicit knowledge resulted in advance preparation of the forthcoming task. In addition, the effect of the precues depended on the secondary task that had to be performed on the basis of explicit knowledge. Whereas for the detection group precues reduced shift costs to the same degree as for the control group, the verbalisation group showed no precueing benefits at all.     

Cross-sectional and longitudinal confirmatory factor models for the german test anxiety inventory: A construct validation

Construct validity of the German Test Anxiety Inventory (TAI-G) was tested in two respects. Firstly, the purported four-dimensional structure of the TAI-G (comprising subscales Emotionality, Worry, Interference, and Lack of Confidence) as well as relations of the test anxiety dimensions to self-efficacy were tested. Secondly, the trait conception of the TAI-G was tested within the framework of Latent State-Trait theory. The TAI-G was given to a student sample (N=302) on three occasions with a time interval of 2 weeks along with a study-specific self-efficacy scale on occasion 1. Dimensionality assumptions as well as relations with self-efficacy were tested using cross-sectional second-order confirmatory factor analysis. The trait conception was tested separately for TAI-G subscales by specifying longitudinal confirmatory factor models (Latent State-Trait models) and by calculating variance proportions of manifest variables (Latent State-Trait coefficients) referring to different sources of systematic variance (person, situation, and method) based on parameter estimates of the models. Results were supportive of both the purported four-dimensional structure and hypothesized relationships to self-efficacy (i.e., acceptable model fit) as well as of the trait conception of test anxiety (i.e., acceptable model fit and high proportion of variance due to person component). Implications for further validation studies were discussed.     

Beziehungs- oder Mentalisierungsfähigkeit

This paper investigates the predictive value of the psychological mindedness assessment procedure (PMAP) with respect to differential group therapy outcome using outpatient group therapies with patients suffering from somatoform disorders. Within the contextual framework of the mentalization theory the possible predictive power of the PMAP prior to indications for therapy is reflected. As the results of 50 patients from 6 therapy groups show high PMAP ratings prior to treatment onset predict group suitability of patients. This in turn is predictive for an emotional attunement of such patients during treatment, which is in itself a qualification for an emotional involvement with the group interactive process and therefore highly predictive. In contrast patients with a lower PMAP rating should be referred to groups where another treatment concept or technical attitude on the part of the group leader is realized. The shorter the therapy groups last the more homogeneous group composition should be regarding psychological functioning of patients prior to treatment onset (level of mentalization).     

Perceptual load effects on processing distractor faces indicate face-specific capacity limits

The claim that face perception is mediated by a specialized “face module” that proceeds automatically, independently of attention (e.g., Kanwisher, 2000) can be reconciled with load theory claims that visual perception has limited capacity (e.g., Lavie, 1995) by hypothesizing that face perception has face-specific capacity limits. We tested this hypothesis by comparing the effects of face and nonface perceptual load on distractor face processing. Participants searched a central array of either faces or letter strings for a pop star versus politician's face or name and made speeded classification responses. Perceptual load was varied through the relevant search set size. Response competition effects from a category-congruent or -incongruent peripheral distractor face were eliminated with more than two faces in the face search task, but were unaffected by perceptual load in the name search task. These results support the hypothesis that face perception has face-specific capacity limits and resolve apparent discrepancies in previous research.     

Suppression of negative and expression of positive emotions: Divergent effects of emotional display rules in a hostile service interaction

Cross-sectional studies have found that demands to express positive emotions have more desirable associations with service providers' well-being and service quality than demands to suppress negative emotions. Despite their potential importance, emotional labour research has not clarified the nature of these differences yet. The present experimental study aimed to investigate the causal effects of demands to suppress negative emotions, demands to express positive emotions, and their interaction in a simulated service interaction. In total, 101 participants were instructed to play the role of a service employee, who had to interact with a dissatisfied and uncivil customer. Participants were randomly given information that the organization expected them to (1) express genuinely felt emotions, (2) suppress negative emotions, (3) express positive emotions, or (4) suppress negative emotions and express positive emotions. Results confirmed that demands to suppress negative emotions decreased well-being, whereas demands to express positive emotions led to a better service quality. Moreover, service quality was only increased if demands to express positive emotions were not supplemented by demands to suppress negative emotions. These findings suggest that not only demands to express positive emotions can reduce the cost/benefit ratio of emotional labour, but also organizations should avoid imposing demands to suppress negative emotions.     

Intact emotion-induced recognition bias in neuropsychological patients with executive control deficits

In recognition memory tasks, emotionally negative words are judged more often as "old" relative to emotionally neutral words, suggesting a shift in response bias. We wondered whether this bias shift was due to the flexible regulation of executive control during memory retrieval. To address this question, we investigated individuals with high variability in executive control functions. As expected, we observed that emotional word meaning did indeed have a strong influence on the bias toward responding "old," independent of recognition accuracy and overall response bias. However, these effects were uncorrelated with executive control, as measured by the Trail Making Test, and were fully intact, even in a sample of hospitalized neurological patients with severe executive dysfunctions, some of whom had marked damage in fronto-thalamo-striatal networks. Having concluded that the emotion-induced bias must develop on different grounds, we went on to discuss alternative explanations.     

Effects of pointing direction and direction predictability on event-related lateralizations of the EEG

In two experiments, we investigated hemispheric electroencephalography (EEG) differences in 9(12) healthy volunteers during pointing to lateral and central targets. The questions addressed were whether horizontal pointing direction and the predictability of pointing direction modulated hemispheric differences (event-related lateralizations of the EEG = ERLs). To vary pointing direction predictability, targets were displayed either randomly at one of nine different positions on a screen (random) or at the same horizontal position in five subsequent trials (sequenced) while vertical positions varied randomly. Event-related lateralizations (ERLs) varied with pointing direction. This was true across changes in target eccentricity and pointing distance. Foci of the ERLs were in premotor and posterior parietal cortex, which might reflect the critical involvement of these areas in the control of visually guided reaching. Direction predictability reduced the parietal and premotor ERL before pointing onset, probably reflecting a lesser effort in visuomotor transformation. Predictability also added an overlying N2pc component to the early ERL after target onset and increased direction effects during movement.     

Cortical plasticity associated with stuttering therapy

Neuroimaging studies have indicated that persistent developmental stuttering (PDS) may be associated both with an abnormality in white matter of left-hemispheric speech areas and a right-hemispheric hyperactivity. The latter may compensate for the deficient structural connectivity in the left hemisphere. To investigate the effects of stuttering therapy on brain activity nine male adults with PDS underwent functional magnetic resonance imaging (fMRI) before and within 12 weeks after fluency shaping therapy. Brain response differences during overt sentence reading before and after therapy were assessed by utilizing random effects analyses. After therapy, a more widespread activation was observed in frontal speech and language regions and temporal areas of both hemispheres, particularly and more pronounced on the left side. Interestingly, distinct posttreatment left-sided activation increases were located directly adjacent to a recently detected area of white matter anomaly [M. Sommer, M.A. Koch, W. Paulus, C. Weiller, C. Buchel (2002). Disconnection of speech-relevant brain areas in persistent developmental stuttering. The Lancet, 360, 380-383] suggesting that fluency shaping techniques reorganize neuronal communication between left-sided speech motor planning, motor execution, and temporal areas. Hence, a therapeutic mechanism can be assumed to remodel brain circuitry close to the source of the dysfunction instead of reinforcing compensation via homologous contralateral brain networks. EDUCATIONAL OBJECTIVES: The reader will learn about and be able to: (1) describe brain activation changes detected shortly after fluency-shaping therapy; (2) identify left-hemispheric regions where a (re)functionalization after fluency-shaping therapy seems to occur adjacent to a recently described abnormal white matter region in PDS subjects; and (3) discuss how an effective cerebral compensation mechanism for stuttering could work.