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The neural dynamics of conflict adaptation within a look-to-do transition.

Tang D, Hu L, Li H, Zhang Q, Chen A - PLoS ONE (2013)

Bottom Line: However, the neural dynamics of conflict adaptation is still unclear.In the present study, behavioral and electroencephalography (EEG) data were recorded from seventeen healthy participants during performance of a color-word Stroop task with a novel look-to-do transition.All these findings showed that top-down conflict adaptation is implemented by: (1) enhancing the sensitivity to conflict detection and the adaptation to conflict resolution; (2) modulating the effective connectivity between parietal region and right-frontal region.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Cognition and Personality of Ministry of Education, Faculty of Psychology, Southwest University, Chongqing, China.

ABSTRACT

Background: For optimal performance in conflict situations, conflict adaptation (conflict detection and adjustment) is necessary. However, the neural dynamics of conflict adaptation is still unclear.

Methods: In the present study, behavioral and electroencephalography (EEG) data were recorded from seventeen healthy participants during performance of a color-word Stroop task with a novel look-to-do transition. Within this transition, participants looked at the Stroop stimuli but no responses were required in the 'look' trials; or made manual responses to the Stroop stimuli in the 'do' trials.

Results: In the 'look' trials, the amplitude modulation of N450 occurred exclusively in the right-frontal region. Subsequently, the amplitude modulation of sustained potential (SP) emerged in the posterior parietal and right-frontal regions. A significantly positive correlation between the modulation of reconfiguration in the 'look' trials and the behavioral conflict adaptation in the 'do' trials was observed. Specially, a stronger information flow from right-frontal region to posterior parietal region in the beta band was observed for incongruent condition than for congruent condition. In the 'do' trials, the conflict of 'look' trials enhanced the amplitude modulations of N450 in the right-frontal and posterior parietal regions, but decreased the amplitude modulations of SP in these regions. Uniquely, a stronger information flow from centro-parietal region to right-frontal region in the theta band was observed for iI condition than for cI condition.

Conclusion: All these findings showed that top-down conflict adaptation is implemented by: (1) enhancing the sensitivity to conflict detection and the adaptation to conflict resolution; (2) modulating the effective connectivity between parietal region and right-frontal region.

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Related in: MedlinePlus

Experimental procedure and behavioral data.Panel A illustrates the timing parameters of one trial (above) and part of the trial sequence within the look-to-do transition design (below); the asterisk preceding the colored words informed participants only to look at the color of forthcoming word (‘look’ trial), the cross informed participants to respond to the color of the forthcoming stimulus (‘do’ trial). Panel B illustrates the mean RT in the ‘do’ trials as a function of congruency in the ‘look’ trials. The RT(iI–iC) was significantly smaller than RT(cI–cC) (error bars were SEM). NB. ‘c or C’ are the congruent condition; ‘i or I’ are the incongruent condition.
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pone-0057912-g001: Experimental procedure and behavioral data.Panel A illustrates the timing parameters of one trial (above) and part of the trial sequence within the look-to-do transition design (below); the asterisk preceding the colored words informed participants only to look at the color of forthcoming word (‘look’ trial), the cross informed participants to respond to the color of the forthcoming stimulus (‘do’ trial). Panel B illustrates the mean RT in the ‘do’ trials as a function of congruency in the ‘look’ trials. The RT(iI–iC) was significantly smaller than RT(cI–cC) (error bars were SEM). NB. ‘c or C’ are the congruent condition; ‘i or I’ are the incongruent condition.

Mentions: Fig. 1A depicts part of the trial sequence and the timing of one trial. All trials started with a fixation for 500 ms, followed by a blank screen for 500∼800 ms (interval varied randomly) from offset of fixation to target onset. A colored word was then presented until a key was pressed or for 1,500 ms, whichever came first. A blank screen was again presented for 800∼1,200 ms (interval varied randomly) from target offset to fixation onset, and then the next trial started. For each trial, the fixation was either an asterisk (*) or a cross (+), which indicated that the forthcoming trial would be a ‘look’ trial or a ‘do’ trial, respectively. In the ‘look’ trials, the participants were instructed to simply look at the color and ignore the semantics of words without executing any response. In the ‘do’ trials, the participants were instructed to press the “D” key using the left middle finger if the color of the word was red, the “F” key using the left forefinger if the color of the word was green, “J” key using the right forefinger if the color of the word was yellow, and the “K” key using the right middle finger if the color of the word was blue. They were instructed to perform the task as fast and as accurately as possible. Each participant completed one practice block including 64 trials prior to completing six experimental blocks including 870 trials, with a 2-min break between blocks. Since the present analyses focused on the look-to-do paired trials, i.e., each ‘look’ trial was followed by a ‘do’ trial, only the number of look-to-do paired trials was calculated. There were 320 ‘look’ trials and ‘do’ trials, respectively; the number of congruent and incongruent trials was equal. In addition, the ‘do’ trials were divided into cC, cI, iC, and iI conditions, each of which included 80 trials. The remainder-paired trials were excluded from the analyses.


The neural dynamics of conflict adaptation within a look-to-do transition.

Tang D, Hu L, Li H, Zhang Q, Chen A - PLoS ONE (2013)

Experimental procedure and behavioral data.Panel A illustrates the timing parameters of one trial (above) and part of the trial sequence within the look-to-do transition design (below); the asterisk preceding the colored words informed participants only to look at the color of forthcoming word (‘look’ trial), the cross informed participants to respond to the color of the forthcoming stimulus (‘do’ trial). Panel B illustrates the mean RT in the ‘do’ trials as a function of congruency in the ‘look’ trials. The RT(iI–iC) was significantly smaller than RT(cI–cC) (error bars were SEM). NB. ‘c or C’ are the congruent condition; ‘i or I’ are the incongruent condition.
© Copyright Policy
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC3585284&req=5

pone-0057912-g001: Experimental procedure and behavioral data.Panel A illustrates the timing parameters of one trial (above) and part of the trial sequence within the look-to-do transition design (below); the asterisk preceding the colored words informed participants only to look at the color of forthcoming word (‘look’ trial), the cross informed participants to respond to the color of the forthcoming stimulus (‘do’ trial). Panel B illustrates the mean RT in the ‘do’ trials as a function of congruency in the ‘look’ trials. The RT(iI–iC) was significantly smaller than RT(cI–cC) (error bars were SEM). NB. ‘c or C’ are the congruent condition; ‘i or I’ are the incongruent condition.
Mentions: Fig. 1A depicts part of the trial sequence and the timing of one trial. All trials started with a fixation for 500 ms, followed by a blank screen for 500∼800 ms (interval varied randomly) from offset of fixation to target onset. A colored word was then presented until a key was pressed or for 1,500 ms, whichever came first. A blank screen was again presented for 800∼1,200 ms (interval varied randomly) from target offset to fixation onset, and then the next trial started. For each trial, the fixation was either an asterisk (*) or a cross (+), which indicated that the forthcoming trial would be a ‘look’ trial or a ‘do’ trial, respectively. In the ‘look’ trials, the participants were instructed to simply look at the color and ignore the semantics of words without executing any response. In the ‘do’ trials, the participants were instructed to press the “D” key using the left middle finger if the color of the word was red, the “F” key using the left forefinger if the color of the word was green, “J” key using the right forefinger if the color of the word was yellow, and the “K” key using the right middle finger if the color of the word was blue. They were instructed to perform the task as fast and as accurately as possible. Each participant completed one practice block including 64 trials prior to completing six experimental blocks including 870 trials, with a 2-min break between blocks. Since the present analyses focused on the look-to-do paired trials, i.e., each ‘look’ trial was followed by a ‘do’ trial, only the number of look-to-do paired trials was calculated. There were 320 ‘look’ trials and ‘do’ trials, respectively; the number of congruent and incongruent trials was equal. In addition, the ‘do’ trials were divided into cC, cI, iC, and iI conditions, each of which included 80 trials. The remainder-paired trials were excluded from the analyses.

Bottom Line: However, the neural dynamics of conflict adaptation is still unclear.In the present study, behavioral and electroencephalography (EEG) data were recorded from seventeen healthy participants during performance of a color-word Stroop task with a novel look-to-do transition.All these findings showed that top-down conflict adaptation is implemented by: (1) enhancing the sensitivity to conflict detection and the adaptation to conflict resolution; (2) modulating the effective connectivity between parietal region and right-frontal region.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Cognition and Personality of Ministry of Education, Faculty of Psychology, Southwest University, Chongqing, China.

ABSTRACT

Background: For optimal performance in conflict situations, conflict adaptation (conflict detection and adjustment) is necessary. However, the neural dynamics of conflict adaptation is still unclear.

Methods: In the present study, behavioral and electroencephalography (EEG) data were recorded from seventeen healthy participants during performance of a color-word Stroop task with a novel look-to-do transition. Within this transition, participants looked at the Stroop stimuli but no responses were required in the 'look' trials; or made manual responses to the Stroop stimuli in the 'do' trials.

Results: In the 'look' trials, the amplitude modulation of N450 occurred exclusively in the right-frontal region. Subsequently, the amplitude modulation of sustained potential (SP) emerged in the posterior parietal and right-frontal regions. A significantly positive correlation between the modulation of reconfiguration in the 'look' trials and the behavioral conflict adaptation in the 'do' trials was observed. Specially, a stronger information flow from right-frontal region to posterior parietal region in the beta band was observed for incongruent condition than for congruent condition. In the 'do' trials, the conflict of 'look' trials enhanced the amplitude modulations of N450 in the right-frontal and posterior parietal regions, but decreased the amplitude modulations of SP in these regions. Uniquely, a stronger information flow from centro-parietal region to right-frontal region in the theta band was observed for iI condition than for cI condition.

Conclusion: All these findings showed that top-down conflict adaptation is implemented by: (1) enhancing the sensitivity to conflict detection and the adaptation to conflict resolution; (2) modulating the effective connectivity between parietal region and right-frontal region.

Show MeSH
Related in: MedlinePlus