scholarly journals Electrophysiological correlates of unconscious processes of race

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Francesca Pesciarelli ◽  
Irene Leo ◽  
Luana Serafini
Keyword(s):  
Reaction Times ◽  
Event Related Potentials ◽  
Neural Mechanisms ◽  
Unconscious Processes ◽  
Race Effect ◽  
The Face ◽  
Related Potentials ◽  
Face Stimuli ◽  
The Brain ◽  
Prime Target

AbstractThe study aimed to examine the neural mechanisms underlying implicit other-race face processing by the use of the masked and unmasked priming manipulation. Two types of prime-target pairs were presented while recording Event-related potentials (ERPs): Same face pairs (prime-target were identical faces), and Different face pairs (prime-target were different faces). Prime-target pairs were half Asian (other-race) and half Caucasian (own-race) faces. The face stimuli on each pair were of the same gender and race. Participants (all Caucasians) had to decide whether the target was a male or a female face (gender task). The prime face could be unmasked or masked. On the behavioral side, our findings showed a race effect, that is slower reaction times (RTs) for other-race than own-race face stimuli, regardless of masking. On the ERPs side, our data showed a race effect across all components analyzed (P100, N100, N200, P300), under both the unmasked and masked manipulations. Besides, we found, in the unmasked condition, a priming effect as a function of race on the N100, N200, and P300 components; but, interestingly, in the masked condition, only on the P300. Overall, our findings provide evidence that race information is available very early in the brain and can strongly activate and influence people’s behaviors even without conscious awareness.

Aesthetics of Faces

2008 ◽  
Vol 22 (1) ◽  
pp. 41-57 ◽  
Author(s):  
Anja Roye ◽  
Lea Höfel ◽  
Thomas Jacobsen
Keyword(s):  
Time Course ◽  
Reaction Times ◽  
Event Related Potentials ◽  
Cognitive Effort ◽  
Aesthetic Judgment ◽  
Stimulus Material ◽  
Male And Female ◽  
Facial Beauty ◽  
The Face ◽  
Related Potentials

Temporal and brain topographic characteristics of the aesthetic judgment of male and female faces were investigated, using event-related potentials and reaction times. The evaluative aesthetic judgment of facial beauty (beautiful vs. not beautiful) was contrasted with a nonevaluative descriptive judgment of head shape (round vs. oval). Analysis showed longer reaction times in the descriptive than in the evaluative task, suggesting that the descriptive judgment demanded more cognitive effort and may entail greater uncertainty. Electrophysiologically, the evaluative judgment elicited a negativity (400 to 480 ms) for the judgment not beautiful, maximal over midline leads. A comparable deflection has been previously reported for evaluative judgments of graphic patterns. It was interpreted as an impression formation independent of the type of stimulus material, occurring when an aesthetic entity is judged intentionally. Besides this effect, which was independent of the gender of the face, the temporal characteristics of aesthetic evaluation differed depending on the gender of the face. We report a negativity for male faces only (280–440 ms) and a late positivity (520–1200 ms), which was stronger for female faces, both concerning not beautiful judgments. Thus, the evaluation of male and female facial beauty was processed in different time-windows. The descriptive judgment round elicited a larger posterior positivity compared with oval (320–620 ms). These results complement investigations of the architecture and time course of evaluative aesthetic and descriptive judgment processes, using faces as stimulus material.

scholarly journals In exogenous attention, time is the clue: brain and heart interactions to survive threatening stimuli

2020 ◽  
Author(s):  
Elisabeth Ruiz-Padial ◽  
Francisco Mercado
Keyword(s):  
Emotional Regulation ◽  
Time Course ◽  
Reaction Times ◽  
Event Related Potentials ◽  
Neural Mechanisms ◽  
Exogenous Attention ◽  
Neural Responses ◽  
Related Potentials ◽  
Negative Stimuli

AbstractThe capture of exogenous attention by negative stimuli has been interpreted as adaptive for survival in a diverse and changing environment. In the present paper, we investigate the neural responses towards two discrete negative emotions with different biological meanings, disgust and fear, and its potential relationships with heart rate variability (HRV) as an index of emotional regulation. With that aim, 30 participants performed a digit categorization task while fear, disgust and neutral distractor pictures were presented. Resting HRV at baseline, behavioral responses, and event-related potentials were recorded. Whereas P1 amplitudes were highest to fear distractors, the disgust stimulation led to augmented P2 amplitudes compared to the rest of distractors. Interestingly, increased N2 amplitudes were also found to disgust distractors, but only in high HRV participants. Neural source estimation data point to the involvement of the insula in this exogenous attentional response to disgust. Additionally, disgust distractors provoked longer reaction times than fear and neutral distractors in the high HRV group. Present findings are interpreted in evolutionary terms suggesting that exogenous attention is captured by negative stimuli following a different time course for fear and disgust. Possible HRV influences on neural mechanisms underlying exogenous attention are discussed considering the potential important role of this variable in emotional regulation processes.

scholarly journals The Effects of Dynamic and Static Emotional Facial Expressions of Humans and Their Avatars on the EEG: An ERP and ERD/ERS Study

2021 ◽  
Vol 15 ◽  
Author(s):  
Teresa Sollfrank ◽  
Oona Kohnen ◽  
Peter Hilfiker ◽  
Lorena C. Kegel ◽  
Hennric Jokeit ◽  
...  
Keyword(s):  
Facial Expressions ◽  
Event Related Potentials ◽  
Emotional Facial Expressions ◽  
Emotional Faces ◽  
Dynamic Facial Expressions ◽  
The Face ◽  
Related Potentials ◽  
Face Stimuli ◽  
Human Faces ◽  
Healthy Participants

This study aimed to examine whether the cortical processing of emotional faces is modulated by the computerization of face stimuli (”avatars”) in a group of 25 healthy participants. Subjects were passively viewing 128 static and dynamic facial expressions of female and male actors and their respective avatars in neutral or fearful conditions. Event-related potentials (ERPs), as well as alpha and theta event-related synchronization and desynchronization (ERD/ERS), were derived from the EEG that was recorded during the task. All ERP features, except for the very early N100, differed in their response to avatar and actor faces. Whereas the N170 showed differences only for the neutral avatar condition, later potentials (N300 and LPP) differed in both emotional conditions (neutral and fear) and the presented agents (actor and avatar). In addition, we found that the avatar faces elicited significantly stronger reactions than the actor face for theta and alpha oscillations. Especially theta EEG frequencies responded specifically to visual emotional stimulation and were revealed to be sensitive to the emotional content of the face, whereas alpha frequency was modulated by all the stimulus types. We can conclude that the computerized avatar faces affect both, ERP components and ERD/ERS and evoke neural effects that are different from the ones elicited by real faces. This was true, although the avatars were replicas of the human faces and contained similar characteristics in their expression.

scholarly journals Long-term Expertise with Artificial Objects Increases Visual Competition with Early Face Categorization Processes

2007 ◽  
Vol 19 (3) ◽  
pp. 543-555 ◽  
Author(s):  
Bruno Rossion ◽  
Daniel Collins ◽  
Valérie Goffaux ◽  
Tim Curran
Keyword(s):  
Temporal Cortex ◽  
Event Related Potentials ◽  
Stimulus Onset ◽  
Neural Representations ◽  
Visual Processes ◽  
Face Categorization ◽  
The Face ◽  
Blank Interval ◽  
Related Potentials ◽  
Face Stimuli

The degree of commonality between the perceptual mechanisms involved in processing faces and objects of expertise is intensely debated. To clarify this issue, we recorded occipito-temporal event-related potentials in response to faces when concurrently processing visual objects of expertise. In car experts fixating pictures of cars, we observed a large decrease of an evoked potential elicited by face stimuli between 130 and 200 msec, the N170. This sensory suppression was much lower when the car and face stimuli were separated by a 200-msec blank interval. With and without this delay, there was a strong correlation between the face-evoked N170 amplitude decrease and the subject's level of car expertise as measured in an independent behavioral task. Together, these results show that neural representations of faces and nonface objects in a domain of expertise compete for visual processes in the occipito-temporal cortex as early as 130–200 msec following stimulus onset.

scholarly journals The effect of empathy and context on face-processing ERPs

2020 ◽  
Author(s):  
Gillian M Clark ◽  
Claire McNeel ◽  
Felicity J Bigelow ◽  
Peter Gregory Enticott
Keyword(s):  
Face Processing ◽  
Event Related Potentials ◽  
Background Information ◽  
Early Posterior Negativity ◽  
Empathy Quotient ◽  
The Face ◽  
Related Potentials ◽  
Processing Event ◽  
Harm To Others ◽  
Face Stimuli

The investigation of emotional face processing has largely used faces devoid of context, and does not account for within-perceiver differences in empathy. The importance of context in face perception has become apparent in recent years. This study examined the interaction of the contextual factors of facial expression, knowledge of a person’s character, and within-perceiver empathy levels on face processing event-related potentials (ERPs). Forty-two adult participants learned background information about six individuals’ character. Three types of character were described, in which the character was depicted as deliberately causing harm to others, accidentally causing harm to others, or undertaking neutral actions. Subsequently, EEG was recorded while participants viewed the characters’ faces displaying neutral or emotional expressions. Participants’ empathy was assessed using the Empathy Quotient survey. Results showed a significant interaction of character type and empathy on the early posterior negativity (EPN) ERP component. These results suggested that for those with either low or high empathy, more attention was paid to the face stimuli, with more distinction between the different characters. In contrast, those in the middle range of empathy tended to produce smaller EPN with less distinction between character types. Findings highlight the importance of trait empathy in accounting for how faces in context are perceived.

scholarly journals Pupil dilation and P3 reflect subjective surprise about decision outcome

2020 ◽  
Author(s):  
Jan Willem de Gee ◽  
Camile M.C. Correa ◽  
Matthew Weaver ◽  
Tobias H. Donner ◽  
Simon van Gaal
Keyword(s):  
Animal Cognition ◽  
Event Related Potentials ◽  
Decision Task ◽  
Internal Factors ◽  
The Face ◽  
Related Potentials ◽  
P3 Component ◽  
Physiological Markers ◽  
The Brain

AbstractCentral to human and animal cognition is the ability to learn from feedback in order to optimize future rewards. Such a learning signal might be encoded and broadcasted by the brain’s arousal systems, including the noradrenergic locus coeruleus. Pupil responses and the P3 component of event-related potentials reflect rapid changes in the arousal level of the brain. Here we ask whether and how these variables may reflect “subjective surprise”: the mismatch between one’s expectation about being correct and the outcome of a decision, when expectations fluctuate due to internal factors (e.g., engagement). We show that during an elementary decision-task in the face of uncertainty both physiological markers of phasic arousal reflect subjective surprise. We further show that pupil responses and P3 are unrelated to each other, and that subjective prediction error computations depend on feedback awareness. These results further advance our understanding of the role of central arousal systems in decision-making under uncertainty.

scholarly journals In exogenous attention, time is the clue: Brain and heart interactions to survive threatening stimuli

PLoS ONE ◽  
2021 ◽  
Vol 16 (5) ◽  
pp. e0243117
Author(s):  
Elisabeth Ruiz-Padial ◽  
Francisco Mercado
Keyword(s):  
Emotional Regulation ◽  
Time Course ◽  
Reaction Times ◽  
Event Related Potentials ◽  
Neural Mechanisms ◽  
Exogenous Attention ◽  
Neural Responses ◽  
Related Potentials ◽  
Negative Stimuli

The capture of exogenous attention by negative stimuli has been interpreted as adaptive for survival in a diverse and changing environment. In the present paper, we investigate the neural responses towards two discrete negative emotions with different biological meanings, disgust and fear, and its potential relationships with heart rate variability (HRV) as an index of emotional regulation. With that aim, 30 participants performed a digit categorization task while fear, disgust and neutral distractor pictures were presented. Resting HRV at baseline, behavioral responses, and event-related potentials were recorded. Whereas P1 amplitudes were highest to fear distractors, the disgust stimulation led to augmented P2 amplitudes compared to the rest of distractors. Interestingly, increased N2 amplitudes were also found to disgust distractors, but only in high HRV participants. Neural source estimation data point to the involvement of the insula in this exogenous attentional response to disgust. Additionally, disgust distractors provoked longer reaction times than fear and neutral distractors in the high HRV group. Present findings are interpreted in evolutionary terms suggesting that exogenous attention is captured by negative stimuli following a different time course for fear and disgust. Possible HRV influences on neural mechanisms underlying exogenous attention are discussed considering the potential important role of this variable in emotional regulation processes.

Face and Word Recognition in Patients with Left and Right Hemispheric Lesions: Evidence from Reaction Times and ERPs

2002 ◽  
Vol 13 (1) ◽  
pp. 69-83 ◽  
Author(s):  
Stefan R. Schweinberger ◽  
Thomas Klos ◽  
Werner Sommer
Keyword(s):  
Slow Wave ◽  
Reaction Times ◽  
Memory Search ◽  
Event Related Potentials ◽  
Performance Deficits ◽  
Set Size ◽  
Left Brain ◽  
Related Potentials ◽  
Abstract Words ◽  
Left Brain Damage

Abstract: We recorded reaction times (RTs) and event-related potentials (ERPs) in patients with unilateral lesions during a memory search task. Participants memorized faces or abstract words, which were then recognized among new ones. The RT deficit found in patients with left brain damage (LBD) for words increased with memory set size, suggesting that their problem relates to memory search. In contrast, the RT deficit found in patients with RBD for faces was apparently related to perceptual encoding, a conclusion also supported by their reduced P100 ERP component. A late slow wave (720-1720 ms) was enhanced in patients, particularly to words in patients with LBD, and to faces in patients with RBD. Thus, the slow wave was largest in the conditions with most pronounced performance deficits, suggesting that it reflects deficit-related resource recruitment.

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