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Dense sensor event-related brain potentials were measured in participants with spider phobia, high anxiety sensitive individuals and non-fearful controls during viewing of medical emergency, spider and standard emotional (pleasant, unpleasant, neutral) pictures. Compared to non-fearful controls spider phobia participants showed a significantly enlarged late positive potential (LPP) during the encoding of phobia-relevant pictures whereas high anxiety sensitive individuals showed a significantly greater Early Posterior Negativity (EPN) during the encoding of medical emergency pictures and a significantly greater Late Positive Potential (LPP) during the encoding of highly arousing unpleasant visual material. Moreover, within group comparisons of the spider phobia group revealed comparable LPP evoked by spider pictures and emotional (unpleasant and pleasant) picture contents indicating that at the level of early stimulus evaluation, the effects of selective attention seem to be related to emotional relevance of the stimulus rather than reflecting a fear-specific response.
A paradigm was developed to experimentally investigate the dysregulation of affective reactivity in clinical depression. The literature so far reported evidence for three directions of dysregulation - negative potentiation, positive attenuation, and emotion context insensitivity. Therefore a paradigm was designed to allow to test all three hypotheses simultaneously. Furthermore, to enable generalization across the specific stimuli used in the experiment, stimuli of two sensory modalities were used - pictures and sounds. Because it was hypothesized, that the specificity of affective reactivity of depressed patients will be especially prominent in long lasting affective situations, a categorically blocked presentation mode was chosen. Regarding the dependent variables, a multimethod approach was conducted. Besides self-report ratings of the feeling state, startle responses, skin conductance responses, heart rate, and the electromyogram of the corrugator and zygomatic muscle were recorded. In a separate session, BOLD-responses during picture viewing were collected by functional magnetic resonance imaging (fMRI). Both sessions were conducted with three samples: a healthy student sample, a depressed outpatient sample, and a healthy age and gender matched control sample. The results of the patient sample support an integration of the emotion context insensitivity and the negative potentiation hypothesis. Patients reported generally to feel more unpleasant and more aroused than healthy controls. Skin conductance and startle responses were modulated by valence to a smaller degree in the patients than in the controls. No group differences were found in the facial muscle activity. BOLD-responses were potentiated during unpleasant compared to neutral pictures in the patient but not in the control group in the amygdala, the insular cortex and the orbito frontal cortex. A model to integrate these results is developed. Its central assumption is, that the inability to respond to affective stimuli is an aversive experience and therefore leads to a negativity bias in attention and cognition. Direction of further research and implications for psychotherapies are discussed.
The learning theory of panic disorder differs between panic attacks and anxious apprehension as distinct emotional states. Acute panic is accompanied by extreme fear, experience of strong body symptoms reflecting autonomic surge and flight tendencies. In contrast, anxious apprehension is associated with hypervigilance towards bodily sensations and increased distress when subtle somatic symptoms are identified. Following animal models, these clinical entities reflect different stages of defensive reactivity depending upon the imminence of interoceptive or exteroceptive threat cues with lowest distance to threat during panic attacks. We tested this model by investigating the dynamics of defensive reactivity in a large group of patients suffering from panic disorder and agoraphobia (PD/AG) prior to a multicenter controlled clinical trial. Three hundred forty-five patients participated in a standardized behavioral avoidance test (being entrapped in a small, dark chamber for 10 minutes). Defensive reactivity was assessed measuring avoidance and escape behavior, self reports of anxiety and panic symptoms, autonomic arousal (heart rate and skin conductance), and potentiation of the startle reflex before and during the exposure period of the behavioral avoidance test. While 125 patients showed strong anxious apprehension during the task (as indexed by increased reports of anxiety, elevated physiological arousal, and startle potentiation), 72 patients escaped from the test chamber. Active escape was initiated at the peak of the autonomic surge accompanied by an inhibition of the startle response as predicted by the animal model. These physiological responses were observed during 34 reported panic attacks as well. We found evidence that defensive reactivity in PD/AG patients is dynamically organized ranging from anxious apprehension to panic with increasing proximity of interoceptive threat. Importantly, the patients differed quite substantially according defensive reactivity during the behavioral avoidance test despite all patients received the same principal diagnosis. These differences can be explained in part by differences in the disposition according to two genetic variants previously associated with panic disorder. Patients carrying the risk variant of a polymorphism in the neuropeptide S receptor gene showed an overall increased heart rate during the whole behavioral avoidance test reflecting an enhanced sympathomimetic activation and consequently arousal level. During the entrapment situation in which heart rate further increased over an already elevated baseline level, risk variant carriers were prone to experience more panic symptoms. This is in line with the learning perspective of panic disorder, postulating that internal cues of elevated arousal increase the chance of experiencing another panic attack once they have been associated with aversive responses. Furthermore, the risk variant of a polymorphism in the monoamine oxidase A gene was observed to augment the occurrence of panic attacks and escape behavior preparation. In addition, we find evidence that suggest an enhanced resistance to corrective learning experiences as indicated by a lack of a reduction of avoiding and escaping behavior during repeated test chamber exposures in wait-list control patients carrying the risk gene variant. Both effects may strengthen the learning mechanism hypothesized to be involved in the pathogenesis of panic disorder. Exteroceptive and interoceptive cues previously associated with the initial panic attack might trigger subsequent attacks in risk allele carriers more rapidly while simultaneously the opportunity to dissolve once established associations due to contradictory experiences is limited. Now, differential dispositions regarding defensive reactivity in PD/AG patients has to be linked to mechanisms supposed to be involved in exposure based therapy. First outcome evaluations of the clinical trial indicated that a behavioral therapy variant suggested to be linked with higher fear activation during exposure exercises is more effective than another. Further analyses have to proof whether those patients showing a clear specific fear response during the behavioral avoidance test benefit more than others from exposure based therapy.
Background: Controversy surrounds the questions whether co-occurring depression has negative effects on cognitivebehavioral therapy (CBT) outcomes in patients with panic disorder (PD) and agoraphobia (AG) and whether treatment for PD and AG (PD/AG) also reduces depressive symptomatology. Methods: Post-hoc analyses of randomized clinical trial data of 369 outpatients with primary PD/AG (DSM-IV-TR criteria) treated with a 12-session manualized CBT (n = 301) and a waitlist control group (n = 68). Patients with comorbid depression (DSM-IV-TR major depression, dysthymia, or both: 43.2% CBT, 42.7% controls) were compared to patients without depression regarding anxiety and depression outcomes (Clinical Global Impression Scale [CGI], Hamilton Anxiety Rating Scale [HAM-A], number of panic attacks, Mobility Inventory [MI], Panic and Agoraphobia Scale, Beck Depression Inventory) at post-treatment and follow-up (categorical). Further, the role of severity of depressive symptoms on anxiety/depression outcome measures was examined (dimensional). Results: Comorbid depression did not have a significant overall effect on anxiety outcomes at post-treatment and follow-up, except for slightly diminished post-treatment effect sizes for clinician-rated CGI (p = 0.03) and HAM-A (p = 0.008) when adjusting for baseline anxiety severity. In the dimensional model, higher baseline depression scores were associated with lower effect sizes at post-treatment (except for MI), but not at follow-up (except for HAM-A). Depressive symptoms improved irrespective of the presence of depression. Conclusions: Exposure-based CBT for primary PD/AG effectively reduces anxiety and depressive symptoms, irrespective of comorbid depression or depressive symptomatology.
People smile in various emotional contexts, for example, when they are amused or angry or simply being polite. We investigated whether younger and older adults differ in how well they are able to identify the emotional experiences accompanying smile expressions, and whether the age of the smiling person plays a role in this respect. With this aim, we produced 80 video episodes of three types of smile expressions: positive-affect smiles had been spontaneously displayed by target persons as they were watching amusing film clips and cartoons. Negative-affect smiles had been displayed spontaneously by target persons during an interaction in which they were being unfairly accused. Affectively neutral smiles were posed upon request. Differences in the accompanying emotional experiences were validated by target persons' self-reports. These smile videos served as experimental stimuli in two studies with younger and older adult participants. In Study 1, older participants were less likely to attribute positive emotions to smiles, and more likely to assume that a smile was posed. Furthermore, younger participants were more accurate than older adults at identifying emotional experiences accompanying smiles. In Study 2, both younger and older participants attributed positive emotions more frequently to smiles shown by older as compared to younger target persons, but older participants did so less frequently than younger participants. Again, younger participants were more accurate than older participants in identifying emotional experiences accompanying smiles, but this effect was attenuated for older target persons. Older participants could better identify the emotional state accompanying smiles shown by older than by younger target persons. Taken together, these findings indicate that there is an age-related decline in the ability to decipher the emotional meaning of smiles presented without context, which, however, is attenuated when the smiling person is also an older adult.
Children as young as 3 years can remember an object’s location within an arrangement and can retrieve it from a novel viewpoint (Nardini et al., 2006). However, this ability is impaired if the arrangement is rotated to compensate for the novel viewpoint, or, if the arrangement is rotated and children stand still. There are two dominant explanations for this phenomenon: self-motion induces an automatic spatial updating process which is beneficial if children move around the arrangement, but misleading if the children’s movement is matched by the arrangement and not activated if children stand still and only the arrangement is moved (see spatial updating; Simons and Wang, 1998). Another explanation concerns reference frames: spatial representations might depend on peripheral spatial relations concerning the surrounding room instead on proximal relations within the arrangement, even if these proximal relations are sufficient or more informative. To evaluate these possibilities, we rotated children (N = 120) aged between 3 and 6 years with an occluded arrangement. When the arrangement was in misalignment to the surrounding room, 3- and 4-year-olds’ spatial memory was impaired and 5-year-olds’ was lightly impaired suggesting that they relied on peripheral references of the surrounding room for retrieval. In contrast, 6-years-olds’ spatial representation seemed robust against misalignment indicating a successful integration of spatial representations.
The shared decline in cognitive abilities, sensory functions (e.g., vision and hearing), and physical health with increasing age is well documented with some research attributing this shared age-related decline to a single common cause (e.g., aging brain). We evaluate the extent to which the common cause hypothesis predicts associations between vision and physical health with social cognition abilities specifically face perception and face memory. Based on a sample of 443 adults (17–88 years old), we test a series of structural equation models, including Multiple Indicator Multiple Cause (MIMIC) models, and estimate the extent to which vision and self-reported physical health are related to face perception and face memory through a common factor, before and after controlling for their fluid cognitive component and the linear effects of age. Results suggest significant shared variance amongst these constructs, with a common factor explaining some, but not all, of the shared age-related variance. Also, we found that the relations of face perception, but not face memory, with vision and physical health could be completely explained by fluid cognition. Overall, results suggest that a single common cause explains most, but not all age-related shared variance with domain specific aging mechanisms evident.
Modulation of emotional episodic memory in humans. Evidence from event-related potential studies.
(2015)
In the dissertation, own research on the modulation of emotional episodic long-term memory, especially on recognition memory performance and encoding- and retrieval-related event-related potentials (ERPs), is presented. Three ERP studies were conducted. The first study investigated spontaneous remembering of emotional events. In the second experiment, a crossover design for memory recognition studies was tested. The third study explored the noradrenergic influences on emotional memory. Next to discussing the results in the light existing findings and concepts (natural selective attention by Bradley & Lang and neuromodulation hypothesis by McGaugh), the obtained results are put in a broader context of emotional episodic long-term memory and the possible implications for clinical research are indicated.
High-Frequency Binaural Beats Increase Cognitive Flexibility: Evidence from Dual-Task Crosstalk
(2016)
Increasing evidence suggests that cognitive-control processes can be configured to optimize either persistence of information processing (by amplifying competition between decision-making alternatives and top-down biasing of this competition) or flexibility (by dampening competition and biasing). We investigated whether high-frequency binaural beats, an auditory illusion suspected to act as a cognitive enhancer, have an impact on cognitive-control configuration. We hypothesized that binaural beats in the gamma range bias the cognitive-control style toward flexibility, which in turn should increase the crosstalk between tasks in a dual-task paradigm. We replicated earlier findings that the reaction time in the first-performed task is sensitive to the compatibility between the responses in the first and the second task—an indication of crosstalk. As predicted, exposing participants to binaural beats in the gamma range increased this effect as compared to a control condition in which participants were exposed to a continuous tone of 340 Hz. These findings provide converging evidence that the cognitive-control style can be systematically biased by inducing particular internal states; that high-frequency binaural beats bias the control style toward more flexibility; and that different styles are implemented by changing the strength of local competition and top-down bias.