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Subjective mood estimation co-varies with spectral power EEG characteristics

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Wyczesany M., Kaiser J., Coenen A. M. L.
Acta Neurobiologiae Experimentalis
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2008
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vol. 68
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issue 2
180-192
EN
Co-variation between subjectively estimated mood/activation and EEG characteristics, based on spectral power parameters, was investigated. Subjective estimation of mood was made by using Thayer's Activation-Deactivation Adjective Checklist, which yielded two dimensions: Energy-Tiredness (with Energy pole having positive valence connotation) and Tension-Calmness (negative connotation for Tension). A within-subject design with two sessions of EEG recording immediately followed by mood assessment was applied. These were separated by a cognitive task, introduced in order to modify the subjects' mood. The correlations between changes in mood estimation and changes in EEG spectral power parameters were calculated. Both ADACL dimensions co-varied with EEG in a specific way according to frequency and localization. Subjective estimation of Energy correlated negatively with alpha1 and, surprisingly, positively with delta, theta1 as well as theta2 relative power. Estimation of Tension correlated positively with theta1 and beta1, and negatively with alpha2 relative power. Presented results suggest that the adjective description of mood has objectively-measurable brain correlates in the EEG.
2
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Categorization of unilaterally presented emotional words: an ERP analysis

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Schapkin S. A., Gusev A. N., Kuhl J.
Acta Neurobiologiae Experimentalis
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2000
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vol. 60
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issue 1
17-28
EN
This study is intended to clarify the functional role of different ERP components as indicators of the processing of emotions. The effect of emotional connotation of words on hemispheric lateralization is also explored. Visual ERPs were recorded to unilaterally presented positive, negative, and neutral words that should be categorized according to their emotional connotation. The P2 amplitude was larger to positive than to negative words whereas P3 amplitude was larger to positive words compared with neutral ones. The slow positive wave (SPW) was influenced by words emotionality at anterior and posterior sites differently. The amplitude of the N1 component was larger in the left hemisphere to contralaterally presented words. The P2 and P3 components were larger over the left hemisphere whereas the N3 and N4 components were larger over the right hemisphere to ipsilateral stimulation. The results support our hypotheses on the functional role of positive ERP components in the processing of an affective words connotation: the P2 wave reflects a general evaluation of emotional significance, the P3 a task-related decision, and the SPW an additional decision control in the context of the emotional experience of an individual. Neither the 'right hemisphere hypothesis' nor 'valence hypothesis' on lateralization of the processing of emotions were confirmed. Each hemisphere seems to exert its effect on emotion through specific hemispheric resources that are unequally allocated along the different stages of task processing and may cause alternation of hemispheric dominance.
3
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Central control of heart rate changes during visual affective processing as revealed by fMRI

100%
Kuniecki M., Urbanik A., Sobiecka B., Kozub J., Binder M.
Acta Neurobiologiae Experimentalis
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2003
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vol. 63
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issue 1
39-48
EN
In the present study we addressed the question of central control of heart rate (HR) in emotions. Parallel measurement of HR changes and changes of local intensity of blood flow as indexed by fMRI in a procedure eliciting emotions allowed us to pinpoint areas of the brain responsible for HR variations during emotional arousal. In condition eliciting positive emotions we detected activation of occipito-temporal regions, anterior insula, and hypothalamus. In condition eliciting negative emotions we also detected activation of occipito-temporal regions and additionally activation of bilateral anterior insulae, right amygdala and right superior temporal gyrus. The results show that structures constituting neural network involved in HR control during emotional arousal are affect specific. Particularly the central circuit controlling HR in negative affect includes the amygdala, while central circuit controlling HR in positive affect includes the hypothalamus. Additionally activation of bilateral occipito-temporal cortex proves enhancement of visual processing of emotional material as compared to neutral material in both positive and negative affect. This might be attributed to top-down processes originating in the frontal lobe and related to shifting attention to the emotionally relevant stimuli. Activation of insular cortex is probably related to autonomic arousal accompanying watching emotional content (e.g. sweating, heart-rate changes etc.). Activation of the amygdala in the negative condition supports the well documented engagement of this structure in processing of fear and disgust.
4
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Emotion-dependent modulation of interference processes: An fMRI study

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Sommer M., Hajak G., Dohnel K., Meinhardt J., Muller J. L.
Acta Neurobiologiae Experimentalis
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2008
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vol. 68
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issue 2
193-203
EN
We studied the effects of experimentally induced emotions on inhibitory control using functional magnetic resonance tomography (fMRI). The Simon task used involves two conditions with different attentional demands and is a well established paradigm for studying inhibitory control. Incompatible trials demand cognitive control for resolving interference. Compatible trials need no inhibitory control. Twelve participants viewed a series of affective pictures inducing positive, negative or neutral affects. Between the picture blocks, participants performed either incompatible or compatible trials. Behavioral and fMRI data revealed an impact of negative emotions only on the processing of ncompatible trials. Subjects made more errors and showed less activation of brain areas associated with task performance. There was no effect of positive emotions neither on compatible nor incompatible trials. The results first showed that especially the processing of negative emotions is resource competing and secondly that the competition concerns only the controlled route of cognitive processing.
5
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Emotionally negative stimuli are resistant to repetition priming

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Marchewka A., Nowicka A.
Acta Neurobiologiae Experimentalis
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2007
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vol. 67
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issue 1
83-92
EN
The study was aimed at testing whether the repetition priming was influenced by affective valence of visual stimuli. Neutral and emotionally negative words and images were shown in the right or in the left visual field. Each of the stimuli was repeated twice, with 2 to 4 other stimuli presented between repetitions. The subjects' task was detection of a stimulus. Responses were given by index finger of the left or right hand. The task was the same for all stimuli, the new and the repeated ones. Reaction times were measured and analyzed. The effects of repetition priming were significant only for neutral stimuli: repeated items were detected faster than the new ones. For emotionally negative items, generally no priming was observed. Interestingly, new emotionally negative stimuli were detected significantly faster in comparison to neutral stimuli. The results are discussed in relation to attentional processes involved in processing of affective stimuli.
6
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Emotion perception and interpersonal behaviour in epilepsy patients after unilateral amygdalohippocampectomy

88%
Ammerlaan E. J. G., Hendriks M. P. H., Colon A. J., Kessels R. P. C.
Acta Neurobiologiae Experimentalis
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2008
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vol. 68
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issue 2
214-218
EN
Aim of this study was to examine the relation between perception of facial expressions and interpersonal behavior in epilepsy patients after unilateral amygdalohippocampectomy (AH). Nine patients with unilateral amygdalohippocampectomy and 14 controls completed a forced-choice emotional recognition task, in which morphed facial emotional expressions were shown at different emotional intensities, and a self-report questionnaire of interpersonal behavior. Face perception and depressive symptoms were also taken into account. Compared to normal controls, patients were less sensitive in the recognition of fearful and disgusted facial expressions, in line with previous reports. These impairments were only minimally correlated with self-report interpersonal behavior. In all, unilateral damage to the amygdala and medial temporal lobe results in subtle emotion recognition impairments, but these deficits do not appear to extend to self-reported impairments in everyday interpersonal behavior. Further studies need to explore in more detail the effects of these subtle recognition problems on daily social intercourse.
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