Emotional Significance of the Stimulus and Features of the Personality as Factors Reflected in the Pattern of Evoked EEG Potentials

Коваленко, А. А.; Павленко, В. Б.

doi:10.1007/s11062-010-9100-5

Cited by 5 publications

(3 citation statements)

References 185 publications

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“…The N170 component of visual ERPs is a negative waveform peaking approximately 155-190 msec post-stimulus. It is mostly observed in the occipito-temporal sites and, as is commonly supposed, represents the earliest stage of facial structure encoding [17,19]. Our detection method for this component was in line with earlier experiments.…”

Section: Methodssupporting

confidence: 85%

“…Among the variety of methods used in face recognition studies, recording of event-related potentials (ERPs) is one of the most well-established techniques currently applied to investigate the time course of neural responses to different facial expressions. The key component in the face and facial expression studies using ERPs is the N170 deflection [17,18]. Recent studies demonstrated that patients with schizophrenia exhibit reduced N170 amplitudes during neutral and emotional face processing [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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Emotional Face Perception in Patients with Schizophrenia: an Event-Related Potential Study

2013

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Emotional face recognition has been shown to be drastically impaired among patients with schizophrenia. Since the underlying processes of this deficit have not been widely addressed, we attempted to investigate the relationship between facial expression perception and clinical symptoms in patients with schizophrenia. We enrolled 28 patients with schizophrenia and 28 healthy adults matched by their sex and age. The amplitude and latency of component N170 in event-related EEG potentials (ERPs) induced by presentations of happy, fearful, and neutral face images were comparatively evaluated in these two groups. Furthermore, the relationship between the N170 measures and clinical symptoms of schizophrenia were assessed using the Positive and Negative Syndrome Scale (PANSS). The N170 responses to facial expressions in patients with schizophrenia were significantly delayed, as compared to healthy control participants [F (1, 54) = 4.25, P = 0.044]. The N170 response to fearful faces (as compared to happy and neutral faces) was elicited with the minimum latency in the control group, while this component was most delayed among schizophrenics. Positive schizophrenia symptoms correlated with the amplitudes of the left-hemisphere N170 component in response to happy, fearful, and neutral faces. Our findings suggest that the facial expression deficit in schizophrenia is related to delayed responses in face perception and is influenced by the severity of positive symptoms. The evident delay in fearful face perception among patients with schizophrenia may partly explain their inappropriate reactions to threatening conditions.

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Section: Methodssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Emotional Face Perception in Patients with Schizophrenia: an Event-Related Potential Study

2013

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“…At present, a significant increase in the number of studies dealing with the neurophysiological basis of emotional reactions in humans is observed (the respective information is presented in a few reviews [1,2]). According to modern psychological and physiological theories emphasizing the differentiated structure of emotional reactions [3], the first stage of development of such responses is based on perception of emotiogenic information, including decoding of external (auditory, visual, tactile, etc.)…”

Section: Introductionmentioning

confidence: 99%

Reflection of the Emotional Significance of Visual Stimuli in the Characteristics of Evoked EEG Potentials

2010

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Healthy subjects (n = 88) were asked to passively visualize positive and passive emotiogenic visual stimuli and also stimuli with a neutral emotional content. Images of the International Affective Picture System (IAPS) were used. Amplitude/time characteristics of the components of evoked EEG potentials (EPs), P1, N1, P2, N2, and P3 and topographic distribution of the latter components were analyzed. The latencies, amplitudes, and topography of the EP waves induced by presentation of positive and negative stimuli were found to be different from the respective values for the EPs induced by neutral stimuli. The level and pattern of these differences typical of different EP components were dissimilar and depended on the sign of the emotions. Specificities related to the valency of an identified stimulus were observed within nearly all stages of processing of visual signals, for the negative stimuli, beginning from an early stage of sensory analysis corresponding to the development of wave Р1. The latencies of components Р1 in the case of presentation of emotiogenic negative stimuli and those of components N1, N2, and Р3 in the case of presentation of the stimuli of both valencies were shorter than the latencies observed at neutral stimuli. The amplitude of component N2 at perception of positive stimuli was, on average, lower, while the Р3 amplitude at perception of all emotiogenic stimuli was higher than in the case of presentation of neutral stimuli. The time dynamics of topographic peculiarities of processing of emotiogenic information were complicated. Activation of the left hemisphere was observed during the earliest stages of perception, while the right hemisphere was activated within the intermediate stages. Generalized activation of the cortex after the action of negative signals and dominance of the left hemisphere under conditions of presentation of positive stimuli were observed only within the final stages. As is supposed, emotiogenic stimuli possess a greater biological significance than neutral ones, and this is why the former attract visual attention first; they more intensely activate the respective cortical zones, and the corresponding visual information is processed more rapidly. The observed effects were more clearly expressed in the case of action of negative stimuli; these effects involved more extensive cortical zones. These facts are indicative of the higher intensity of activating influences of negative emotiogenic stimuli on neutral systems of the higher CNS structures.

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Effects of Correct and Wrong Answers on ERPs Recorded under Conditions of the Continuous Performance Test in ADHD/Normal Participants

et al. 2010

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Parameters of event-related potentials (ERPs) regarding correct and wrong answers under conditions of the continuous performance test (CPT) were measured in 50 adult subjects characterized by different levels of sustained attention with the absence/presence of attention deficit/hyperactivity disorders (ADHD). For ERP extraction, the average for each group of signals, which were time-locked to the onset of stimuli, was calculated; two ERP groups were considered separately for correct and wrong answers. In both groups, the P300 wave was clearly observed. The time dynamics of ERP components were investigated in six defined time blocks. At the peak of P300, a prominent component of brain activity could be observed. Some ERP morphological features (704 items) were extracted from these potentials. The results indicated that 11 of the obtained features showed a significant (P < 0.01) relation to the level of sustained attention. When comparing correct and wrong answers, 10 features in the normal group and 3 features in the ADHD group demonstrated significant differences (P < 0.05), which means that the participant's response is reflected in the features of EEG signal. The results reveal a promising relation between CPT results and some parameters of brain signals, which can be used for further evaluations of the sustained attention level.

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Emotional Significance of the Stimulus and Features of the Personality as Factors Reflected in the Pattern of Evoked EEG Potentials

Cited by 5 publications

References 185 publications

Emotional Face Perception in Patients with Schizophrenia: an Event-Related Potential Study

Emotional Face Perception in Patients with Schizophrenia: an Event-Related Potential Study

Reflection of the Emotional Significance of Visual Stimuli in the Characteristics of Evoked EEG Potentials

Effects of Correct and Wrong Answers on ERPs Recorded under Conditions of the Continuous Performance Test in ADHD/Normal Participants

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