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Institut
- Psychologie (212) (entfernen)
Benzodiazepine und Neuroleptika werden in der klinischen Praxis effektiv in der Behandlung verschiedener Angststörungen eingesetzt. Trotz ihrer weiten Verbreitung wurden ihre Effekte auf die physiologische Komponente (v. a. die Hypothalamus-Hypophysen-Nebennierenrinden Achse (HHNA) und das sympatho-adrenomedulläre System (SAM)) der Stress- und Angstreaktion bisher allerdings wenig gut untersucht. Ziel der vorliegenden Untersuchung war es deshalb, die Effekte zweier prominenter anxiolytischer Substanzen, Alprazolam (Benzodiazepin) und Flupentixol (Neuroleptikum), auf die Aktivierung der HHNA und des SAM durch einen reinen psychogenen Stressor, den Trier Sozial Stress Test (TSST), zu untersuchen. Studienteilnehmer waren 69 junge, gesunde Männer, die eine bzw. drei Stunden vor dem TSST entweder 1mg Alprazolam, 0.5mg Flupentixol oder ein entsprechendes Placebo-Präparat oral einnahmen. Vor und nach dem TSST wurden verschiedene Blut- und Speichelproben zur Bestimmung von ACTH, Cortisol, Noradrenalin, Adrenalin, Prolaktin und Wachstumshormon entnommen, zudem wurden Herzfrequenz, Blutdruck und Körpertemperatur erfasst. Über Fragebögen bewerteten die Probanden ihr aktuelles psychisches Wohlbefinden. Nach der Einnahme von Alprazolam war eine deutlich verminderte Aktivierung der HHNA in Reaktion auf den TSST zu beobachten, während Parameter des SAM unbeeinflusst blieben. Auf den entsprechenden Fragebogenskalen schätzten sich die Probanden nach Alprazolam- im Vergleich zur Placebo-Einnahme deutlich müder ein, zudem zeigten sich stimmungsstabilisierende Eigenschaften von Alprazolam, da Probanden nach Alprazolam-Einnahme eine geringere Beeinträchtigung der guten Stimmung durch den TSST erlebten. Nach der Einnahme von Flupentixol vor dem TSST unterschieden sich die Probanden in keinem der erhobenen Parameter signifikant von der Placebo-Kontrollgruppe, lediglich die Blutkonzentrationen der Katecholamine Adrenalin und Noradrenalin waren signifikant erhöht. Diese Daten verdeutlichen rasch einsetzende und auf die verschiedenen Komponenten der Stressreaktion differentiell wirkende Effekte von Alprazolam, während Effekte von Flupentixol auf die physiologischen Komponenten der Stressreaktion möglicherweise erst nach längerer Einnahme zu beobachten sind.
Many people are aware of the negative consequences of plastic use on the environment. Nevertheless, they use plastic due to its functionality. In the present paper, we hypothesized that this leads to the experience of ambivalence—the simultaneous existence of positive and negative evaluations of plastic. In two studies, we found that participants showed greater ambivalence toward plastic packed food than unpacked food. Moreover, they rated plastic packed food less favorably than unpacked food in response evaluations. In Study 2, we tested whether one-sided (only positive vs. only negative) information interventions could effectively influence ambivalence. Results showed that ambivalence is resistant to (social) influence. Directions for future research were discussed.
Cortisol exhibits typical ultradian and circadian rhythm and disturbances in its secretory pattern have been described in stress-related pathology. The aim of this thesis was to dissect the underlying structure of cortisol pulsatility and to develop tools to investigate the effects of this pulsatility on immune cell trafficking and the responsiveness of the neuroendocrine system and GR target genes to stress. Deconvolution modeling was set up as a tool for investigation of the pulsatile secretion underlying the ultradian cortisol rhythm. This further allowed us to investigate the role of the single cortisol pulses on the immune cell trafficking and the role of induced cortisol pulses on the kinetics of expression of GR target genes. The development of these three tools, would allow to induce and investigate in future the significance of single cortisol pulses for health and disease.
Traumabewältigung
(2004)
The complicated human alternative GR promoter region plays a pivotal role in the regulation of GR levels. In this thesis, both genomic and environmental factors linked with GR expression are covered. This research showed that GR promoters were susceptible to silencing by methylation and the activity of the individual promoters was also modulated by SNPs. E2F1 is a major element to drive the expression of GR 1F transcripts and single CpG dinucleotide methylation cannot mediate the inhibition of transcription in vitro. Also, the distribution of GR first exons and 3" splice variants (GRα and GR-P) is expressed throughout the human brain with no region-specific alternative first exon usage. These data mirrored the consistently low levels of methylation in the brain, and the observed homogeneity throughout the studied regions. Taken together, the research presented in this thesis explored several layers of complexity in GR transcriptional regulation.
The influence of affect on vocal parameters has been well investigated in speech portrayed by actors, but little is known about affect expression in more natural or authentic speech behavior. This is partly due to the difficulty of generating speech samples that represent authentic expression of speaker affect. The present work investigates the influence of speaker affect on the vocal fundamental frequency (F0) in comparatively authentic speech samples. Three well-documented psychophysiological research methods were applied for the induction of affective states in German native speakers in order to obtain speech samples with authentic affect expression: the Cold Pressor Test (CPT), the Stroop Color-Word Test (SCWT) and the presentation of slides from the International Affective Pictures System (IAPS). The here reported results show that the influence of affect on F0 is differentially modulated by psychophysiological processes as well as socio-cultural influences. They also indicate that this approach may be useful for future research and further to gain a deeper understanding of authentic vocal affect expression. Moreover, F0 may constitute an additional non-invasive, easy to obtain measure for the established psychophysiological research methodology.
The startle response in psychophysiological research: modulating effects of contextual parameters
(2013)
Startle reactions are fast, reflexive, and defensive responses which protect the body from injury in the face of imminent danger. The underlying reflex is basic and can be found in many species. Even though it consists of only a few synapses located in the brain stem, the startle reflex offers a valuable research method for human affective, cognitive, and psychological research. This is because of moderating effects of higher mental processes such as attention and emotion on the response magnitude: affective foreground stimulation and directed attention are validated paradigms in startle-related research. This work presents findings from three independent research studies that deal with (1) the application of the established "affective modulation of startle"-paradigm to the novel setting of attractiveness and human mating preferences, (2) the question of how different components of the startle response are affected by a physiological stressor and (3) how startle stimuli affect visual attention towards emotional stimuli. While the first two studies treat the startle response as a dependent variable by measuring its response magnitude, the third study uses startle stimuli as an experimental manipulation and investigates its potential effects on a behavioural measure. The first chapter of this thesis describes the basic mechanisms of the startle response as well as the body of research that sets the foundation of startle research in psychophysiology. It provides the rationale for the presented studies, and offers a short summary of the obtained results. Chapter two to four represent primary research articles that are published or in press. At the beginning of each chapter the contribution of all authors is explained. The references for all chapters are listed at the end of this thesis. The overall scope of this thesis is to show how the human startle response is modulated by a variety of factors, such as the attractiveness of a potential mating partner or the exposure to a stressor. In conclusion, the magnitude of the startle response can serve as a measure for such psychological states and processes. Beyond the involuntary, physiological startle reflex, startle stimuli also affect intentional behavioural responses, which we could demonstrate for eye movements in a visual attention paradigm.
Attitudes are "the most distinctive and indispensable concept in contemporary social psychology" (Allport, 1935, p. 798). This outstanding position of the attitude concept in social cognitive research is not only reflected in the innumerous studies focusing on this concept but also in the huge number of theoretical approaches that have been put forth since then. Yet, it is still an open question, what attitudes actually are. That is, the question of how attitude objects are represented in memory cannot be unequivocally answered until now (e.g., Barsalou, 1999; Gawronski, 2007; Pratkanis, 1989, Chapter 4). In particular, researchers strongly differ with respect to their assumptions on the content, format and structural nature of attitude representations (Ferguson & Fukukura, 2012). This prevailing uncertainty on what actually constitutes our likes and dislikes is strongly dovetailed with the question of which processes result in the formation of these representations. In recent years, this issue has mainly been addressed in evaluative conditioning research (EC). In a standard EC-paradigm a neutral stimulus (conditioned stimulus, CS) is repeatedly paired with an affective stimulus (unconditioned stimulus, US). The pairing of stimuli then typically results in changes in the evaluation of the CS corresponding to the evaluative response of the US (De Houwer, Baeyens, & Field, 2005). This experimental approach on the formation of attitudes has primarily been concerned with the question of how the representations underlying our attitudes are formed. However, which processes operate on the formation of such an attitude representation is not yet understood (Jones, Olson, & Fazio, 2010; Walther, Nagengast, & Trasselli, 2005). Indeed, there are several ideas on how CS-US pairs might be encoded in memory. Notwithstanding the importance of these theoretical ideas, looking at the existing empirical work within the research area of EC (for reviews see Hofmann, De Houwer, Perugini, Baeyens, & Crombez, 2010; De Houwer, Thomas, & Baeyens, 2001) leaves one with the impression that scientists have skipped the basic processes. Basic processes hereby especially refer to the attentional processes being involved in the encoding of CSs and USs as well as the relation between them. Against the background of this huge gap in current research on attitude formation, the focus of this thesis will be to highlight the contribution of selective attention processes to a better understanding of the representation underlying our likes and dislikes. In particular, the present thesis considers the role of selective attention processes for the solution of the representation issue from three different perspectives. Before illustrating these different perspectives, Chapter 1 is meant to envision the omnipresence of the representation problem in current theoretical as well as empirical work on evaluative conditioning. Likewise, it emphasizes the critical role of selective attention processes for the representation question in classical conditioning and how this knowledge might be used to put forth the uniqueness of evaluative conditioning as compared to classical conditioning. Chapter 2 then considers the differential influence of attentional resources and goal-directed attention on attitude learning. The primary objective of the presented experiment was thereby to investigate whether attentional resources and goal-directed attention exert their influence on EC via changes in the encoding of CS-US relations in memory (i.e., contingency memory). Taking the findings from this experiment into account, Chapter 3 focuses on the selective processing of the US relative to the CS. In particular, the two experiments presented in this chapter were meant to explore the moderating influence of the selective processing of the US in its relation to the CS on EC. In Chapter 4 the important role of the encoding of the US in relation to the CS, as outlined in Chapter 3, is illuminated in the context of different retrieval processes. Against the background of the findings from the two presented experiments, the interplay between the encoding of CS-US contingencies and the moderation of EC via different retrieval processes will be discussed. Finally, a general discussion of the findings, their theoretical implications and future research lines will be outlined in Chapter 5.
Phase-amplitude cross-frequency coupling is a mechanism thought to facilitate communication between neuronal ensembles. The mechanism could underlie the implementation of complex cognitive processes, like executive functions, in the brain. This thesis contributes to answering the question, whether phase-amplitude cross-frequency coupling - assessed via electroencephalography (EEG) - is a mechanism by which executive functioning is implemented in the brain and whether an assumed performance effect of stress on executive functioning is reflected in phase-amplitude coupling strength. A huge body of studies shows that stress can influence executive functioning, in essence having detrimental effects. In two independent studies, each being comprised of two core executive function tasks (flexibility and behavioural inhibition as well as cognitive inhibition and working memory), beta-gamma phase-amplitude coupling was robustly detected in the left and right prefrontal hemispheres. No systematic pattern of coupling strength modulation by either task demands or acute stress was detected. Beta-gamma coupling might also be present in more basic attention processes. This is the first investigation of the relationship between stress, executive functions and phase-amplitude coupling. Therefore, many aspects have not been explored yet. For example, studying phase precision instead of coupling strength as an indicator for phase-amplitude coupling modulations. Furthermore, data was analysed in source space (independent component analysis); comparability to sensor space has still to be determined. These as well as other aspects should be investigated, due to the promising finding of very robust and strong beta-gamma coupling for all executive functions. Additionally, this thesis tested the performance of two widely used phase-amplitude coupling measures (mean vector length and modulation index). Both measures are specific and sensitive to coupling strength and coupling width. The simulation study also drew attention to several confounding factors, which influence phase-amplitude coupling measures (e. g. data length, multimodality).
The Role of Dopamine and Acetylcholine as Modulators of Selective Attention and Response Speed
(2015)
The principles of top-down and bottom-up processing are essential to cognitive psychology. At their broadest, most general definition, they denote that processing can be driven either by the salience of the stimulus input or by individual goals and strategies. Selective top-down attention, specifically, consists in the deliberate prioritizing of stimuli that are deemed goal-relevant, while selective bottom-up attention relies on the automatic allocation of attention to salient stimuli (Connor, Egeth, & Yantis, 2004; Schneider, Schote, Meyer, & Frings, 2014). Variations within neurotransmitter systems can modulate cognitive performance in a domain-specific fashion (Greenwood, Fossella, & Parasuraman, 2005). Noudoost and Moore (2011a) proposed that the influence of the dopaminergic neurotransmitter system on selective top-down attention might be greater than the influence of this system on selective bottom-up attention; likewise, they assumed that the cholinergic neurotransmitter system might be more important for selective bottom-up than top-down attention. To test this hypothesis, naturally occurring variations within the two neurotransmitter systems were assessed. Five polymorphisms were selected; two of the dopaminergic system (the COMT Val158Met polymorphism and the DAT1 polymorphism) and three of the cholinergic system (the CHRNA4 rs1044396 polymorphism, the CHRNA5 rs3841324 polymorphism, and the CHRNA5 rs16969968 polymorphism). It was tested whether these polymorphisms modulated the performance in tasks of selective top-down attention (a Stroop task and a Negative priming task) and in a task of selective bottom-up attention (a Posner-Cuing task). Indeed, the dopaminergic polymorphisms influenced selective top-down attention, but exerted no effects on bottom-up attention. This aligned with the hypothesis proposed by Noudoost and Moore (2011a). In contrast, the cholinergic polymorphisms were not found to modulate selective bottom-up attention. The three cholinergic polymorphisms, however, affected the general response speed in the Stroop task, Negative priming task, and Posner-Cuing task (irrespective of attentional processing). In sum, the findings of this study provide strong indications that the dopaminergic system modulates selective top-down attention, while the cholinergic system is highly relevant for the general speed of information processing.