| 1. |
- Bernhardsson, Jens, et al.
(författare)
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Changes in Event Related Potentials after exposure therapy for spider phobic individuals
- 2016
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Ingår i: International Journal of Psychophysiology. - : Elsevier BV. - 0167-8760 .- 1872-7697. ; 108, s. 105-106
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The present study was conducted in order to investigate treatment effects in spider phobic individuals on EEG and eye movements. A previous study has shown larger ERP amplitudes in the late positive complex (LPC) post treatment compared to pre treatment during exposure of spider pictures (Leutgeb, Schäfer, & Schienle, 2009). The authors hypothesize that the result might mirror an increase in attention towards the stimuli and reduced attentional avoidance generating enhanced LPC amplitude as a consequence of directing attention to the spider pictures post treatment. In the present study spider fearful individuals (treatment and waitlist group) and control individuals were measured with EEG and Eye tracking during exposure to pictures of spiders, snakes and flowers pre and post treatment. Based on behavioral and self-assessed measures treatment effects were high. Contrary to Leutgeb et al. (2009), our results showed relatively smaller LPC amplitudes post treatment during presentations of spider pictures. Moreover, the eye movement data indicated no avoidance from spider pictures compared to other pictures, neither pre nor post treatment. These results indicate that when individuals attend to visual threat stimuli, LPC amplitude differences follow the pattern of emotional significance and attention allocation.
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| 2. |
- Dang, Junhua, et al.
(författare)
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Individual differences in dopamine level modulate the ego depletion effect
- 2016
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Ingår i: International Journal of Psychophysiology. - : Elsevier. - 0167-8760 .- 1872-7697. ; 99, s. 121-124
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Tidskriftsartikel (refereegranskat)abstract
- Initial exertion of self-control impairs subsequent self-regulatory performance, which is referred to as the ego depletion effect. The current study examined how individual differences in dopamine level, as indexed by eye blink rate (EBR), would moderate ego depletion. An inverted-U-shaped relationship between EBR and subsequent self regulatory performance was found when participants initially engaged in self-control but such relationship was absent in the control condition where there was no initial exertion, suggesting individuals with a medium dopamine level may be protected from the typical ego depletion effect. These findings are consistent with a cognitive explanation which considers ego depletion as a phenomenon similar to switch costs that would be neutralized by factors promoting flexible switching.
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| 3. |
- Dhamija, Devika, et al.
(författare)
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Heritability of startle reactivity and affect modified startle
- 2017
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Ingår i: International Journal of Psychophysiology. - : Elsevier. - 0167-8760 .- 1872-7697. ; 115, s. 57-64
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Tidskriftsartikel (refereegranskat)abstract
- Startle reflex and affect-modified startle reflex are used as indicators of defensive reactivity and emotional processing, respectively. The present study investigated the heritability of both the startle blink reflex and affect modification of this reflex in a community sample of 772 twins ages 14–15 years old. Subjects were shown affective picture slides falling in three valence categories: negative, positive and neutral; crossed with two arousal categories: high arousal and low arousal. Some of these slides were accompanied with a loud startling noise. Results suggestedsex differences in meanlevels of startle reflex as well as in proportions of variance explained by genetic and environmental factors. Females had higher mean startle blink amplitudes for each valence-arousal slide category, indicating greater baseline defensive reactivity compared to males. Startle blink reflex in males was significantly heritable (49%), whereas in females, variance was explained primarily by shared environmental factors (53%) and non-shared environmental factors (41%). Heritability of affect modified startle (AMS) was found to be negligible in both males and females. These results suggest sex differences in the etiology of startle reactivity, while questioning the utility of the startle paradigm for understanding the genetic basis of emotional processing.
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| 4. |
- Harmat, László, 1972-, et al.
(författare)
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Physiological correlates of the flow experience during computer game playing
- 2015
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Ingår i: International Journal of Psychophysiology. - : Elsevier BV. - 0167-8760 .- 1872-7697. ; 97:1, s. 1-7
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Tidskriftsartikel (refereegranskat)abstract
- Flow is the subjective experience of effortless attention, reduced self-awareness, and enjoyment that typically occurs during optimal task performance. Previous studies have suggested that flow may be associated with a non-reciprocal coactivation of the sympathetic and parasympathetic systems and, on a cortical level, with a state of hypofrontality and implicit processing. Here, we test these hypotheses, using the computer game TETRIS as model task. The participants (n = 77) played TETRIS under three conditions that differed in difficulty (Easy < Optimal < Difficult). Cardiac and respiratory activities, and the average oxygenation changes of the prefrontal cortex were measured continuously with functional near infrared spectroscopy (INIRS) during performance. The Optimal condition was characterized by the highest levels of state flow, positive affect, and effortless attention. The associations between self-reported psychological flow and physiological measures were investigated using a series of repeated measures linear mixed model analyses. The results showed that higher flow was associated with larger respiratory depth and lower LF. The higher respiratory depth during high flow is indicative of a more relaxed state with an increased parasympathetic activity, and thus provides partial support for the main hypotheses. There was no association between frontal cortical oxygenation and flow, even at liberal thresholds; i.e. we found no support that flow is related to a state of hypofrontality.
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| 5. |
- Kallionpää, Roosa E., et al.
(författare)
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Single-subject analysis of N400 event-related potential component with five different methods
- 2019
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Ingår i: International Journal of Psychophysiology. - : Elsevier. - 0167-8760 .- 1872-7697. ; 144, s. 14-24
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Tidskriftsartikel (refereegranskat)abstract
- There are several different approaches to analyze event-related potentials (ERPs) at single-subject level, and the aim of the current study is to provide information for choosing a method based on its ability to detect ERP effects and factors influencing the results. We used data from 79 healthy participants with EEG referenced to mastoid average and investigated the detection rate of auditory N400 effect in single-subject analysis using five methods: visual inspection of participant-wise averaged ERPs, analysis of variance (ANOVA) for amplitude averages in a time window, cluster-based non-parametric testing, a novel Bayesian approach and Studentized continuous wavelet transform (t-CWT). Visual inspection by three independent raters yielded N400 effect detection in 85% of the participants in at least one paradigm (active responding or passive listening), whereas ANOVA identified the effect in 68%, the cluster-method in 59%, the Bayesian method in 89%, and different versions of t-CWT in 22–59% of the participants. Thus, the Bayesian method was the most liberal and also showed the greatest concordance between the experimental paradigms (active/passive). ANOVA detected significant effect only in cases with converging evidence from other methods. The t-CWT and cluster-based method were the most conservative methods. As we show in the current study, different analysis methods provide results that do not completely overlap. The method of choice for determining the presence of an ERP component at single-subject level thus remains unresolved. Relying on a single statistical method may not be sufficient for drawing conclusions on single-subject ERPs.
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| 6. |
- Kleberg, Johan L., et al.
(författare)
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Spontaneous eye movements and trait empathy predict vicarious learning of fear
- 2015
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Ingår i: International Journal of Psychophysiology. - : Elsevier BV. - 0167-8760 .- 1872-7697. ; 98:3, s. 577-583
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Tidskriftsartikel (refereegranskat)abstract
- Learning to predict dangerous outcomes is important to survival. In humans, this kind of learning is often transmitted through the observation of others' emotional responses. We analyzed eye movements during an observational/vicarious fear learning procedure, in which healthy participants (N = 33) watched another individual (learning model') receiving aversive treatment (shocks) paired with a predictive conditioned stimulus (CS +), but not a control stimulus (CS). Participants' gaze pattern towards the model differentiated as a function of whether the CS was predictive or not of a shock to the model. Consistent with our hypothesis that the face of a conspecific in distress can act as an unconditioned stimulus (US), we found that the total fixation time at a learning model's face increased when the CS + was shown. Furthermore, we found that the total fixation time at the CS + during learning predicted participants' conditioned responses (CRs) at a later test in the absence of the model. We also demonstrated that trait empathy was associated with stronger CRs, and that autistic traits were positively related to autonomic reactions to watching the model receiving the aversive treatment Our results have implications for both healthy and dysfunctional sodo-emotional learning.
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| 7. |
- Lennartsson, Anna Karin, et al.
(författare)
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Low heart rate variability in patients with clinical burnout
- 2016
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Ingår i: International Journal of Psychophysiology. - : Elsevier BV. - 0167-8760. ; 110, s. 171-178
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Tidskriftsartikel (refereegranskat)abstract
- © 2016 Elsevier B.V.Several studies have shown that acute psychosocial stress and chronic psychosocial stress reduce heart rate variability (HRV). It is likely that individuals suffering from burnout have reduced HRV, as a consequence of the long-term stress exposure. This study investigated HRV in 54 patients with clinical burnout (40 women and 14 men) and in 55 individuals reporting low burnout scores (healthy; 24 women and 31 men) and 52 individuals reporting high burnout scores (non-clinical burnout; 33 women and 19 men). The participants underwent a 300 s ECG recording in the supine position. Standard deviation of normal R-R intervals (SDNN) and the root mean square of successive normal interval differences (RMSSD) were derived from time domain HRV analysis. Frequency domain HRV measures; total power (TP), low frequency power (LF), high frequency power (HF), and LF/HF ratio were calculated. All HRV measures, except LF/HF ratio, were lower in the clinical burnout patients compared to both the non-clinical burnout group and the healthy group. The difference was larger between the patients and the healthy group than between the patients and the non-clinical burnout group. HRV did not differ significantly between the non-clinical burnout group and the healthy group. Low HRV in burnout patients may constitute one of the links to associated adverse health, since low HRV reflects low parasympathetic activity – and accordingly low anabolic/regenerative activity.
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| 8. |
- Rämä, Pia, et al.
(författare)
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Effect of language experience on selective auditory attention : An event-related potential study
- 2018
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Ingår i: International Journal of Psychophysiology. - : Elsevier BV. - 0167-8760 .- 1872-7697. ; 127, s. 38-45
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Tidskriftsartikel (refereegranskat)abstract
- Dual language experience has typically been shown to improve various executive control functions. We investigatedwith event-related brain potentials (ERPs) recorded from early (natively) bilingual speakers andcontrol participants whether it also affects auditory selective attention. We delivered to our participants two tonestreams, one to the left and one to the right ear. Both streams consisted of standard tones and two types ofinfrequent deviant tones which had either an enhanced duration or intensity. The participants were instructed toattend either to the right or left stream and to detect longer-duration deviants in the attended stream. The resultsshowed that the early bilinguals did not outperform the controls in target detection accuracy or speed. However,the late portion of the attention-related ERP modulation (the negative difference, Nd) was larger over the lefthemisphere in the early bilinguals than in the controls, suggesting that the maintenance of selective attention orfurther processing of selectively attended sounds is enhanced in the bilinguals. Moreover, the late reorientingnegativity (RON) in response to intensity-deviant tones was larger in the bilinguals, suggesting more efficientdisengagement of attention from distracting auditory events. Hence, our results demonstrate that brain responsesassociated with certain aspects of auditory attention are enhanced in the bilingual adults, indicating that earlydual language exposure modulates the neuronal responsiveness of auditory modality.
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| 9. |
- Venables, N. C., et al.
(författare)
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Evidence of a prominent genetic basis for associations between psychoneurometric traits and common mental disorders
- 2017
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Ingår i: International Journal of Psychophysiology. - Amsterdam : Elsevier. - 0167-8760 .- 1872-7697. ; 115, s. 4-12
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Tidskriftsartikel (refereegranskat)abstract
- Threat sensitivity (THT) and weak inhibitory control (or disinhibition; DIS) are trait constructs that relate to multiple types of psychopathology and can be assessed psychoneurometrically (i.e., using self-report and physiological indicators combined). However, to establish that psychoneurometric assessments of THT and DIS index biologically-based liabilities, it is important to clarify the etiologic bases of these variables and their associations with clinical problems. The current work addressed this important issue using data from a sample of identical and fraternal adult twins (N = 454). THT was quantified using a scale measure and three physiological indicators of emotional reactivity to visual aversive stimuli. DIS was operationalized using scores on two scale measures combined with two brain indicators from cognitive processing tasks. THT and DIS operationalized in these ways both showed appreciable heritability (0.45, 0.68), and genetic variance in these traits accounted for most of their phenotypic associations with fear, distress, and substance use disorder symptoms. Our findings suggest that, as indices of basic dispositional liabilities for multiple forms of psychopathology with direct links to neurophysiology, psychoneurometric assessments of THT and DIS represent novel and important targets for biologically-oriented research on psychopathology.
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| 10. |
- Åhs, Fredrik, et al.
(författare)
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Human serotonin transporter availability predicts fear conditioning
- 2015
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Ingår i: International Journal of Psychophysiology. - : Elsevier. - 0167-8760 .- 1872-7697. ; 98:3 Pt 2, s. 515-9
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Tidskriftsartikel (refereegranskat)abstract
- Serotonin facilitates fear learning in animals. We therefore predicted that individual differences in the capacity to regulate serotonergic transmission in the human neural fear circuit would be inversely related to fear conditioning. The capacity to regulate serotonergic transmission was indexed by serotonin transporter availability measured with [(11)C]-DASB positron emission tomography. Results indicate that lower serotonin transporter availability in the amygdala, insula and dorsal anterior cingulate cortex predicts enhanced conditioned autonomic fear responses. Our finding supports serotonergic modulation of fear conditioning in humans and may aid in understanding susceptibility for developing anxiety conditions such as post-traumatic stress disorder.
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