On Revising Fuzzy Belief Bases

We look at the problem of revising fuzzy belief bases, i.e., belief base revision in which both formulas in the base as well as revision-input formulas can come attached with varying degrees. Working within a very general framework for fuzzy logic which is able to capture certain types of uncertainty calculi as well as truth-functional fuzzy logics, we show how the idea of rational change from “crisp” base revision, as embodied by the idea of partial meet (base) revision, can be faithfully extended to revising fuzzy belief bases. We present and axiomatise an operation of partial meet fuzzy base revision and illustrate how the operation works in several important special instances of the framework. We also axiomatise the related operation of partial meet fuzzy base contraction.This paper is an extended version of a paper presented at the Nineteenth Conference on Uncertainty in Arti.cial Intelligence (UAI’03).     

Negative mood, self-focused attention, and the experience of physical symptoms: the joint impact hypothesis

A joint impact hypothesis on symptom experience is introduced that specifies the role of negative mood and self-focus, which have been considered independently in previous research. Accordingly, negative affect only promotes symptom experience when people simultaneously focus their attention on the self. One correlational study and 4 experiments supported this prediction: Only negative mood combined with self-focus facilitated the experience (see the self-reports in Studies 1, 2a, & 2b) and the accessibility (lexical decisions, Stroop task in Studies 3 & 4) of physical symptoms, whereas neither positive mood nor negative mood without self-focus did. Furthermore, the joint impact of negative mood and self-focused attention on momentary symptom experience remained significant after controlling for the influence of dispositional symptom reporting and neuroticism.     

“?rgerlich!?“ Neuronale Korrelate der Verhaltenshemmung auf emotionale Signale

Psychotherapeutic interventions for attention deficit hyperactivity disorder (ADHD) primarily aim at the three core symptom clusters of inattention, hyperactivity and impulsivity, which are characteristic for this mental disorder. However, social and emotional difficulties are also very obvious. The ADHD patients experience conflicts with parents and partners, rejection by peers and less friendships, which negatively affects everyday life. Neuroscientific research points to a deficit in ADHD to recognize specific emotions displayed by another person. This dysfunction can be found in children as well as in adults afflicted with this disorder and is especially pronounced for anger. Additionally, the patients have problems to utilize facial anger expressions of others to regulate or inhibit their own behavior. New therapy components are needed in order to reduce this deficit. The possibilities for improving psychotherapy for ADHD by means of neuroscientific methods are discussed.     

Brauchen wir eine ?Neuropsychotherapie“?

The somewhat crude question of whether we need neuropsychotherapy means more precisely whether its neuroscientific perspective can be useful for the psychotherapeutic practice. To answer this question the traditional scientific approaches do not completely suffice. The ??empirical-technical approach?? of quantitative psychotherapy research is of no service here as neuropsychotherapy is only its continuation. Within the framework of this methodology it is not possible to critically reflect on the relevance of neuroscientific research. Such a reflection is, however, the prerequisite for an evaluation of the benefits of neuropsychotherapy. The question about the meaning of neurobiological processes thus leads to the field of epistemology. This ??theoretical approach?? is nonetheless only helpful within limits. It provides an important background of reflection, however it needs to remain abstract compared to psychotherapeutic practice because it does not integrate the specific goals of such practice. What is presented here instead is an ??approach of pragmatic reflection??. This reflection departs from a general purpose of psychotherapy from which the value of neuropsychotherapy can be appropriately estimated. After this clarification the approach of pragmatic reflection can be preliminarily demonstrated with concrete applications of neuroscience in psychotherapy. What is shown hereby is that neuropsychotherapy represents a very specific practice of argumention and action, which implements a logic into psychotherapy that does not fit its contents and goals.     

When do employees cross boundaries? Individual and contextual determinants of career mobility

This study investigates the joint effects of individual characteristics and the labour market on career mobility. We propose that level of education, openness to experience, and a favourable labour market relate positively to employees crossing organizational, industrial, and occupational boundaries. Management programme alumni (N = 503) provided information through an online survey about their career histories, their level of education, and their openness to experience. Additionally, we used the unemployment rate as an indicator for yearly changes in the labour market. The results of our cross-classified multilevel analysis indicate that both individual characteristics and the labour market are determinants of career mobility. Level of education had a positive effect on organizational and industrial boundary crossing, and changes in the labour market related to organizational boundary crossing. Against our assumptions, openness to experience had no effect on career mobility, and none of the predictors were related to occupational boundary crossing. Our results demonstrate the importance of investigating career mobility from a boundary perspective combined with a focus on both individual and contextual characteristics. The dominance of education compared to personality and the difficulty of explaining occupational mobility open new research avenues and yield practical implications for employees, career counsellors, and organizations.     

Tracking independence and merging of prosodic and phonemic processing across infancy

Recent evidence suggests division of labor in phonological analysis underlying speech recognition. Adults and children appear to decompose the speech stream into phoneme‐relevant information and into syllable stress. Here we investigate whether both speech processing streams develop from a common path in infancy, or whether there are two separate streams from early on. We presented stressed and unstressed syllables (spoken primes) followed by initially stressed early learned disyllabic German words (spoken targets). Stress overlap and phoneme overlap between the primes and the initial syllable of the targets varied orthogonally. We tested infants 3, 6 and 9 months after birth. Event‐related potentials (ERPs) revealed stress priming without phoneme priming in the 3‐month‐olds; phoneme priming without stress priming in the 6‐month‐olds; and phoneme priming, stress priming as well as an interaction of both in 9‐month‐olds. In general the present findings reveal that infants start with separate processing streams related to syllable stress and to phoneme‐relevant information; and that they need to learn to merge both aspects of speech processing. In particular the present results suggest (i) that phoneme‐free prosodic processing dominates in early infancy; (ii) that prosody‐free phoneme processing dominates in middle infancy; and (iii) that both types of processing are operating in parallel and can be merged in late infancy.     

Reduced extinction of hippocampal-dependent memories in CPEB knockout mice

CPEB is a sequence-specific RNA binding protein that regulates translation at synapses. In neurons of CPEB knockout mice, synaptic efficacy is reduced. Here, we have performed a battery of behavioral tests and find that relative to wild-type animals, CPEB knockout mice, although similar on many baseline behaviors, have reduced extinction of memories on two hippocampal-dependent tasks. A corresponding microarray analysis reveals that about 0.14% of hippocampal genes have an altered expression in the CPEB knockout mouse. These data suggest that CPEB-dependent local protein synthesis may be an important cellular mechanism underlying extinction of hippocampal-dependent memories.     

Ego-involvement and the difficulty law of motivation: effects on performance-related cardiovascular response

Two experiments found that effort-related cardiovascular reactivity under ego-involvement follows the principles of motivational intensity theory. Experiment 1 manipulated ego-involvement and the difficulty of a memory task. Under high ego-involvement, cardiovascular reactivity during task performance increased with fixed task difficulty; an unfixed performance standard elicited the same high reactivity as a fixed high standard. Experiment 2 manipulated ego-involvement and administered a memory task with unfixed versus extremely high performance standards. High ego-involvement increased cardiovascular reactivity only when the performance standard was unfixed but not when success was obviously impossible. Both studies found associations between cardiovascular reactivity and achievement and controlled for emotional states. The findings clarify previous research and theorizing about ego-involvement and motivation.