Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 7

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
1

Subjective mood estimation co-varies with spectral power EEG characteristics

100%
Wyczesany M., Kaiser J., Coenen A. M. L.
Acta Neurobiologiae Experimentalis
|
2008
|
tom 68
|
nr 2
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

Cortical lateralization patterns related to self-estimation of emotional state

100%
Wyczesany M., Kaiser J., Barry R. J.
Acta Neurobiologiae Experimentalis
|
2009
|
tom 69
|
nr 4
The relationships between subjectively-reported emotional state and hemispheric laterality were investigated. Participants’ emotional state was modified using emotional slides. Self-estimation of Energy Arousal and Hedonic Tone (positive valence) as well as Tense Arousal (negative valence) was derived from the Activation-Deactivation Adjective Checklist and the UWIST Mood Adjective Checklist. Energy arousal was found to be associated with right frontal dominance in the alpha2 (10–12 Hz) band, together with left frontal dominance in the beta2 (16–24 Hz) band. It was also related to left alpha2 dominance in the central and centro-parietal cortex. The effects for the Hedonic Tone scale were limited to a frontal beta2 effect. Surprisingly, no effects of state estimates from the tension scales were observed. It can be concluded that selected qualities of subjective emotional state measured by adjective lists can be related in specific ways to hemispheric laterality, as measured by EEG methods.
3

The influence of mood on visual perception of neutral material

100%
Wyczesany M., Ligeza T. S., Tymorek A., Adamczyk A.
Acta Neurobiologiae Experimentalis
|
2018
|
tom 78
|
nr 2
In the study we investigated how current mood affects spontaneous perceptual processes of neutral stimuli of low‑arousal, unrelated to any specific task. Two separate but similar procedures were carried out: one using functional magnetic resonance imaging (fMRI), the other using electroencephalography based source localization. In both experiments, sessions of passive viewing of neutral pictures were preceded by either a negative or positive mood induction. In response to neutral stimuli, we observed higher activation of visual areas after positive mood induction and lower activations in medial prefrontal and right frontotemporal regions after negative mood induction. We conclude that in relatively safe laboratory conditions, after being exposed to negative emotional content, automatic processes of affective control are recruited by the prefrontal cortex. This results in attenuation of processing of incoming stimuli, as the stimuli do not carry salient information with respect to bottom‑up or top‑down processes. The observed effects may therefore represent an implicit mechanism of perceptual modulation.
4

Top - down and bottom - up competition in visual stimuli processing

100%
Ligeza T. S., Tymorek A. D., Wyczesany M.
Acta Neurobiologiae Experimentalis
|
2017
|
tom 77
|
nr 4
Limited attention capacity results that not all the stimuli present in the visual field are equally processed. While processing of salient stimuli is automatically boosted by bottom‑up attention, processing of task‑relevant stimuli can be boosted volitionally by top‑down attention. Usually, both top‑down and bottom‑up influences are present simultaneously, which creates a competition between these two types of attention. We examined this competition using both behavioral and electrophysiological measures. Participants responded to letters superimposed on background pictures. We assumed that responding to different conditions of the letter task engages top‑down attention to different extent, whereas processing of background pictures of varying salience engages bottom‑up attention to different extent. To check how manipulation of top‑down attention influences bottom‑up processing, we measured evoked response potentials (ERPs) in response to pictures (engaging mostly bottom‑up attention) during three conditions of a letter task (different levels of top‑down engagement). Conversely, to check how manipulation of bottom‑up attention influences top‑down processing, we measured ERP responses for letters (engaging mostly top‑down attention) while manipulating the salience of background pictures (different levels of bottom‑up engagement). The correctness and reaction times in response to letters were also analyzed. As expected, most of the ERPs and behavioral measures revealed a trade‑off between both types of processing: a decrease of bottom‑up processing was associated with an increase of top‑down processing and, similarly, a decrease of top‑down processing was associated with an increase in bottom‑up processing. Results proved competition between the two types of attentions.
5

Pain catastrophizing is associated with altered EEG effective connectivity during pain‑related mental imagery

88%
Ferdek M. A., Adamczyk A. K., van Rijn C. M., Oosterman J. M., Wyczesany M.
Acta Neurobiologiae Experimentalis
|
2019
|
tom 79
|
nr 1
Pain catastrophizing – defined as a tendency to exaggerate the threat value or seriousness of experienced pain - has been shown to be a risk factor for pain chronification. However, the neural basis of pain catastrophizing remains unclear and requires thorough investigation. This study aimed to explore the relationship between pain catastrophizing and effective connectivity of the pain systems in healthy participants. EEG data were collected during an induced state of pain-related negative, depressive, positive and neutral mental imagery conditions, and pain catastrophizing tendencies were measured by the Pain Catastrophizing Scale. The Directed Transfer Function, a method based on Granger causality principles, was used to assess the effective connectivity. Linear mixed effects analyses revealed a negative relationship between pain catastrophizing and beta information flow from the right temporal cortex to the frontal regions and a positive relationship between pain catastrophizing and increased beta information flow from the right somatosensory cortices to the right temporal cortices when thinking about pain. These patterns were not found in other imagery conditions. Taken together, this study suggests that individual differences in pain catastrophizing might be related to an altered frontotemporal regulatory loop and increased connectivity between pain and affective systems. Our study reveals connectivity patterns related to pain catastrophizing tendencies that are detectable even in pain-free, healthy individuals.
6
Content available remote

Electrophysiological correlates of attentional processes in patients with liver cirrhosis without minimal or clinically-overt hepatic encephalopathy

64%
Ciecko-Michalska I., Binder M., Wyczesany M., Szewczyk J., Senderecka M., Wojcik J., Dziedzic T., Slowik A., Mach T.
Journal of Physiology and Pharmacology
|
2012
|
tom 63
|
nr 4
7
Content available remote

Cognitive evoked response potentials in patients with liver cirrhosis without diagnosis of minimal or overt hepatic encephalopathy. A pilot study

64%
Ciecko-Michalska I., Wojcik J., Wyczesany M., Binder M., Szewczyk J., Senderecka M., Dziedzic T., Slowik A., Mach T.
Journal of Physiology and Pharmacology
|
2012
|
tom 63
|
nr 3
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.