scholarly journals Midfrontal-occipital Ɵ-tACS modulates cognitive conflicts related to bodily stimuli

2020 ◽  
Author(s):  
G Fusco ◽  
M Fusaro ◽  
S M Aglioti
Keyword(s):  
Cognitive Control ◽  
Response Times ◽  
Flanker Task ◽  
Theta Oscillations ◽  
Conflict Monitoring ◽  
Related Area ◽  
Specific Stimulus ◽  
Extrastriate Body Area ◽  
Neurophysiological Studies ◽  
Transcranial Alternating Current Stimulation

Abstract Neurophysiological studies show that during tasks tapping cognitive control (like the Flanker task), midfrontal theta (MFϴ) oscillations are associated with conflict and error processing and neural top- down modulation of perceptual processing. What remains unknown is whether perceptual encoding of category-specific stimuli (e.g. body vs letters) used in Flanker-like tasks is modulated by theta oscillations. To explore this issue, we delivered transcranial Alternating Current Stimulation (tACS) in the theta frequency band (6Hz) over the medial frontal cortex (MFC) and the extrastriate body area (EBA) while healthy participants performed two variants of the classical Flanker task, one with stimuli representing human hands (i.e. Hand-Flanker) and the other with stimuli representing coloured letters (i.e. Letter-Flanker). More specifically, we aimed at investigating whether ϴ-tACS involving a body-related area may modulate the long-range communication between neuronal populations underlying conflict monitoring and visuo-perceptual encoding of hand stimuli without affecting the conflict driven by letter stimuli. Results showed faster correct response times during ϴ-tACS in the Hand-Flanker compared to γ-tACS (40Hz) and sham. Importantly, such an effect did not emerge in the Letter-Flanker. Our findings show that theta oscillations over midfrontal-occipital areas modulate bodily specific, stimulus content driven aspects of cognitive control.

Second language (L2) proficiency, socioeconomic status (SES), and intelligence (IQ) are significant predictors of cognitive control differences among young adult unbalanced Chinese–English bilinguals

2018 ◽  
Vol 22 (04) ◽  
pp. 866-882 ◽  
Author(s):  
ZHILONG XIE ◽  
TERESA SIGNORELLI PISANO
Keyword(s):  
Socioeconomic Status ◽  
Second Language ◽  
Young Adult ◽  
Cognitive Control ◽  
Flanker Task ◽  
Incongruent Condition ◽  
Wisconsin Card Sorting Test ◽  
Card Sorting ◽  
Conflict Monitoring ◽  
L2 Proficiency

The current study investigates how second-language (L2) proficiency contributes to cognitive control differences among three groups of unbalanced Chinese–English bilinguals matched for socioeconomic status (SES), intelligence (IQ), education, age, culture, and L1 background. A Flanker task and the Wisconsin Card Sorting Test (WCST) were administered to measure conflict monitoring, inhibition, and mental set shifting. ANOVA analyses revealed faster performance for the High-L2 Group compared to the Low-L2 Group in the congruent, neutral, and incongruent conditions of the Flanker task. However, there were no group differences on the WCST. Multiple step-wise regression analyses showed that L2 proficiency was a predictor for the Flanker task performance in all three conditions, SES in the neutral and the incongruent condition, and IQ in the congruent condition. These results suggest that L2 proficiency, along with SES and IQ, contribute significantly to cognitive control differences in conflict monitoring among young-adult bilinguals.

scholarly journals Anticipating Conflict Facilitates Controlled Stimulus-response Selection

2009 ◽  
Vol 21 (8) ◽  
pp. 1461-1472 ◽  
Author(s):  
Ángel Correa ◽  
Anling Rao ◽  
Anna C. Nobre
Keyword(s):  
Cognitive Control ◽  
Temporal Resolution ◽  
Response Selection ◽  
Flanker Task ◽  
Conflict Detection ◽  
High Temporal Resolution ◽  
Proactive Control ◽  
Conflict Monitoring ◽  
Sequential Effects ◽  
Monitoring Model

Cognitive control can be triggered in reaction to previous conflict, as suggested by the finding of sequential effects in conflict tasks. Can control also be triggered proactively by presenting cues predicting conflict (“proactive control”)? We exploited the high temporal resolution of ERPs and controlled for sequential effects to ask whether proactive control based on anticipating conflict modulates neural activity related to cognitive control, as may be predicted from the conflict-monitoring model. ERPs associated with conflict detection (N2) were measured during a cued flanker task. Symbolic cues were either informative or neutral with respect to whether the target involved conflicting or congruent responses. Sequential effects were controlled by analyzing the congruency of the previous trial. The results showed that cueing conflict facilitated conflict resolution and reduced the N2 latency. Other potentials (frontal N1 and P3) were also modulated by cueing conflict. Cueing effects were most evident after congruent than after incongruent trials. This interaction between cueing and sequential effects suggests neural overlap between the control networks triggered by proactive and reactive signals. This finding clarifies why previous neuroimaging studies, in which reactive sequential effects were not controlled, have rarely found anticipatory effects upon conflict-related activity. Finally, the high temporal resolution of ERPs was critical to reveal a temporal modulation of conflict detection by proactive control. This novel finding suggests that anticipating conflict speeds up conflict detection and resolution. Recent research suggests that this anticipatory mechanism may be mediated by preactivation of ACC during the preparatory interval.

Impairments of response conflict monitoring and resolution in schizophrenia

2002 ◽  
Vol 32 (7) ◽  
pp. 1251-1260 ◽  
Author(s):  
M. YÜCEL ◽  
C. VOLKER ◽  
A. COLLIE ◽  
P. MARUFF ◽  
J. DANCKERT ◽  
...  
Keyword(s):  
Response Times ◽  
Flanker Task ◽  
Anterior Cingulate ◽  
Conflict Monitoring ◽  
Schizophrenia Group ◽  
Multiple Stimulus ◽  
Attentional Shifts ◽  
Attentional Dysfunction ◽  
The Subject ◽  
External Stimuli

Background. It has been argued recently that the attentional dysfunction in schizophrenia occurs as a result of an inability to inhibit automatic attentional shifts to compelling external stimuli. However, this hypothesis is based on performance on paradigms that require overt or covert shifts of spatial attention.Method. We investigated responses to foveally presented stimuli in patients with schizophrenia and healthy controls as they performed unidimensional and bidimensional versions of the flanker task. In both tasks, centrally presented target stimuli were flanked by peripheral stimuli that were either congruent or incongruent with the behavioural goal of the subject. In the bidimensional task, the flanking stimuli could be congruent and incongruent on multiple stimulus characteristics.Results. On the unidimensional flanker task, the behavioural goal modulated the responses of the schizophrenia group such that response times (RTs) to target stimuli that were flanked by congruent stimuli were faster than RTs to target stimuli flanked by incongruent stimuli. However, on the bidimensional flanker task, the responses of schizophrenia patients were no longer constrained by the behavioural goal and RTs to both congruent and incongruent stimuli were equivalent.Conclusions. It appears that the attentional dysfunction in schizophrenia may reflect difficulty in resolving multiple and simultaneous response conflicts. These findings suggest a possible role for the anterior cingulate cortex in the attentional impairments associated with schizophrenia.

scholarly journals Bilingual speakers' enhanced monitoring can slow them down

2021 ◽  
Author(s):  
Roksana Markiewicz ◽  
Ali Mazaheri ◽  
Andrea Krott
Keyword(s):  
Control System ◽  
Cognitive Control ◽  
Response Time ◽  
Evoked Potentials ◽  
Response Times ◽  
Flanker Task ◽  
Response Distribution ◽  
Conflict Task ◽  
Bilingual Speakers ◽  
Response Time Distributions

Performance differences between bilingual and monolingual participants on conflict tasks can be affected by the balance of various sub-processes such as monitoring and stimulus categorisation. Here we investigated the effect of bilingualism on these sub-processes during a conflict task with medium monitoring demand. We examined the behavioural and evoked potentials from a group of bilingual and monolingual speakers during a flanker task with 25% incongruent trials. We analysed behavioural differences by means of averaged response times and ex-Gaussian analyses of response time distributions. For the evoked potentials we focused on the N2 (implicated to be involved in monitoring) and P300 (implicated to be involved in categorisation) responses. We found that bilinguals had significantly longer response distribution tails compared to monolinguals. Additionally, bilinguals exhibited a more pronounced N2 and smaller P3 components compared to their monolingual counterparts, independent of experimental condition, suggesting enhanced monitoring processes and reduced categorisation effort. Importantly, N2 amplitudes were positively and P3 amplitudes were negatively related to the length of response distribution tails. We postulate that these results reflect an overactive monitoring system in bilinguals in a task of medium monitoring demand. This enhanced monitoring leads to less effortful categorisation, but also occasionally to slow responses. These results suggest that changes of the cognitive control system due to bilingual experience changes the balance of processes during conflict tasks, potentially leading to a small behavioural disadvantage.

Quantitative Relation between Conflict and Response Inhibition in the Flanker Task

2005 ◽  
Vol 97 (2) ◽  
pp. 515-526 ◽  
Author(s):  
Tomohiro Takezawa ◽  
Makoto Miyatani
Keyword(s):  
Response Inhibition ◽  
Response Times ◽  
Flanker Task ◽  
Preceding Trial ◽  
Conflict Detection ◽  
Quantitative Relation ◽  
Conflict Monitoring ◽  
Detection Mechanism ◽  
Response Facilitation ◽  
Distance Conditions

The 2001 conflict monitoring hypothesis of Botvinick and colleagues posits that the amount of conflict raised by incongruent stimuli in a flanker task affects subsequent cognitive control, such as response inhibition. The present experiment yielded empirical evidence of the quantitative relation between conflict and response inhibition. Participants judged the direction of a target arrow flanked by distractor arrows presented above and below the target. The amount of conflict was manipulated by varying the distance between the target and the directional distractors. Analysis showed that response times were longer for incongruent trials than for congruent trials, and response times on incongruent trials were longer for the small distance than for the large distance conditions. In addition, the response times in congruent trials became longer as the amount of conflict in the preceding trial increased. These results are consistent with Botvinick, et al.'s hypothesis that the conflict-detection mechanism determines the amount of response inhibition depending on the amount of conflict. Responses on incongruent trials were faster and more accurate when the preceding trial was incongruent than when it was congruent, and the size of this response facilitation was not influenced by the amount of conflict. These results suggest that the conflict detection mechanism modulates the subsequent behaviors by two forms of control which are differently affected by the amount of conflict.

scholarly journals Adolescent Cognitive Control, Theta Oscillations, and Social Motivation

2018 ◽  
Author(s):  
George A. Buzzell ◽  
Tyson V. Barker ◽  
Sonya V. Troller-Renfree ◽  
Edward M. Bernat ◽  
Maureen E. Bowers ◽  
...  
Keyword(s):  
Cognitive Control ◽  
Frontal Cortex ◽  
Behavioral Control ◽  
Flanker Task ◽  
Social Motivation ◽  
Theta Oscillations ◽  
Error Monitoring ◽  
Motor Responses ◽  
Human Adults ◽  
Goal Directed Behavior

SummaryTheta oscillations (4-8 Hz) provide an organizing principle of cognitive control, allowing goal-directed behavior that is conserved across species. In human adults, theta power over medial-frontal cortex (MFC) underlies monitoring, whereas theta synchrony between MFC and lateral-frontal regions reflects control recruitment. Prior work has not separated theta before/after motor responses, nor explained how medial-lateral synchrony drives different kinds of control behaviors. Theta’s role during adolescence, a developmental window characterized by a motivation-control mismatch also remains unclear, preventing possible cross-species work. Here, adolescents performed a flanker task alone or under observation to increase social motivation. We separated theta dynamics immediately before/after motor responses, identifying functional dissociations. We also dissociate MFC connectivity with rostral/caudal frontal cortex and distinct forms of behavioral control, which further differed before/after response. Finally, social motivation was found to exclusively upregulate post-response error monitoring and changes in control to prevent future errors, as opposed to pre-response theta dynamics.

scholarly journals Dynamic Adjustments of Midfrontal Control Signals in Adults and Adolescents

2020 ◽  
Author(s):  
Mate Gyurkovics ◽  
Liat Levita
Keyword(s):  
Cognitive Control ◽  
Flanker Task ◽  
Early Adolescents ◽  
Strong Support ◽  
Task Demands ◽  
Anterior Cingulate ◽  
Theta Oscillations ◽  
Temporal Consistency ◽  
Reactive Control ◽  
Age Related

Abstract During task performance, our level of cognitive control is dynamically adjusted to task demands as reflected, for example, by the congruency sequence effect (CSE) in conflict tasks. Although brain areas related to cognitive control show protracted maturation across adolescence, previous studies found that adolescents show similar behavioral CSEs to adults. In the present study, we investigated whether there are age-related changes in the neural underpinnings of dynamic control adjustments using electroencephalography. Early adolescents (ages 12–14, N = 30) and young adults (ages 25–27, N = 29) completed a confound-minimized flanker task optimized for the detection of sequential control adjustments. The CSE was observed in midfrontal theta power thought to capture anterior cingulate cortex-mediated monitoring processes but was not modulated significantly by age. Adolescents, however, showed a smaller congruency effect in the power and cross-trial temporal consistency of midfrontal theta oscillations than adults. No age differences were observed in phase-based connectivity between midfrontal and lateral frontal regions in the theta band. These findings provide strong support for the role of midfrontal theta oscillations in conflict monitoring and reactive control and suggest that the cognitive system of early adolescents initially responds less reliably to the occurrence of conflict than that of adults.

scholarly journals Too anxious to control: the relation between math anxiety and inhibitory control processes

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
E. Van den Bussche ◽  
K. Vanmeert ◽  
B. Aben ◽  
D. Sasanguie
Keyword(s):  
Cognitive Control ◽  
Control Theory ◽  
Math Anxiety ◽  
Response Times ◽  
Control Function ◽  
Flanker Task ◽  
Proactive Control ◽  
Reactive Control ◽  
Task Context ◽  
Task Irrelevant

AbstractBased on the attentional control theory, math anxiety has been explained in terms of impaired inhibition, a key cognitive control function associated with the central executive. Inhibition allows us to suppress task-irrelevant interference when needed. Inspired by the Dual Mechanisms of Control theory, the current study aimed to disentangle the effect of math anxiety on two cognitive control aspects that can be identified in inhibition. Reactive control occurs after interference is detected and is mostly used in a context where interference is scarce. Proactive control is used to prevent and anticipate interference before it occurs and is preferred in contexts where interference is frequent. We used an arrow flanker task where the proportion of interference was manipulated to stimulate the use of a reactive or proactive control strategy. The results showed that response times on trials containing interference increased with math anxiety, but only in a reactive task context. In a proactive task context response times were not influenced by math anxiety. Our results suggest that math anxiety impairs reactive control. We hypothesize that this finding can be explained by a higher state of distractibility, triggered both by the reactive context and by math anxiety.

Adaptation to Frequent Conflict in the Eriksen Flanker Task

2011 ◽  
Vol 25 (2) ◽  
pp. 50-59 ◽  
Author(s):  
Sascha Purmann ◽  
Stephanie Badde ◽  
Aquiles Luna-Rodriguez ◽  
Mike Wendt
Keyword(s):  
Visual Attention ◽  
Cognitive Control ◽  
Visual Processing ◽  
Flanker Task ◽  
Event Related Potential ◽  
Conflict Adaptation ◽  
Conflict Monitoring ◽  
Early Visual Processing ◽  
Related Potentials ◽  
Conflict Frequency

We examined adaptation to frequent conflict in a flanker task using event-related potentials (ERPs). A prominent model of cognitive control suggests the fronto-central N2 as an indicator of conflict monitoring. Based on this model we predicted (1) an increased N2 amplitude for incompatible compared to compatible stimuli and (2) that this difference in N2 amplitude would be less pronounced under conditions of frequent conflict (high cognitive control). In this model, adaptation to frequent conflict is implemented as modulation of early visual processing. Traditionally, variations in processing selectivity in the flanker task have been related to a zoom lens model of visual attention. Therefore, we further predicted (3) effects of conflict frequency on early visual ERP components of the event-related potential, and (4) generalization of conflict adaptation due to increased conflict frequency in the flanker task to other visuospatial tasks, intermixed within flanker task trials. Frequent conflict was associated with reduced flanker interference in response times (RTs) and error rate. Consistent with the literature, amplitude of the fronto-central N2 was larger and latency of the central P3 longer for incompatible stimuli. Both effects were smaller when conflict was frequent, supporting the notion of fronto-central N2 as indicator of conflict monitoring. Neither amplitude nor latency of the posterior P1, as index of early visual processing, was modulated by conflict frequency. Additionally, conflict frequency in the flanker task did not affect the pattern of RTs in a probe task. In sum, our results suggest that conflict adaptation operates in a task-specific manner and does not necessarily alter early information processing, that is, the spatial focus of visual attention.

Exploring an Emotional Basis of Cognitive Control in the Flanker Task

2020 ◽  
Author(s):  
Motonori Yamaguchi ◽  
Jack Dylan Moore ◽  
Sarah Hendry ◽  
Felicity Wolohan
Keyword(s):  
Cognitive Control ◽  
Facial Expressions ◽  
Mood Induction ◽  
Flanker Task ◽  
Emotional Stimuli ◽  
Emotional Facial Expressions ◽  
Flanker Effect ◽  
Sequential Modulation ◽  
Emotional Basis ◽  
Negative Stimuli

The emotional basis of cognitive control has been investigated in the flanker task with various procedures and materials across different studies. The present study examined the issue with the same flanker task but with different types of emotional stimuli and design. In seven experiments, the flanker effect and its sequential modulation according to the preceding trial type were assessed. Experiments 1 and 2 used affective pictures and emotional facial expressions as emotional stimuli, and positive and negative stimuli were intermixed. There was little evidence that emotional stimuli influenced cognitive control. Experiments 3 and 4 used the same affective pictures and facial expressions, but positive and negative stimuli were separated between different participant groups. Emotional stimuli reduced the flanker effect as well as its sequential modulation regardless of valence. Experiments 5 and 6 used affective pictures but manipulated arousal and valence of stimuli orthogonally The results did not replicate the reduced flanker effect or sequential modulation by valence, nor did they show consistent effects of arousal. Experiment 7 used a mood induction technique and showed that sequential modulation was positively correlated with valence rating (the higher the more positive) but was negatively correlated with arousal rating. These results are inconsistent with several previous findings and are difficult to reconcile within a single theoretical framework, confirming an elusive nature of the emotional basis of cognitive control in the flanker task.

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