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Related Experiment Video

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Task Interruption and Resumption Paradigm for Testing the Activation and Pursuit of an Abstract Thinking Goal

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Published on: April 18, 2017

A brain-potential correlate of task-set conflict.

Heike Elchlepp¹, Freya Rumball, Aureliu Lavric

¹Centre for Cognitive Control and Associative Learning, University of Exeter, Exeter, UK. H.Elchlepp@exeter.ac.uk

Psychophysiology

|January 16, 2013

Summary

Researchers identified a neural signal for task conflict, distinct from response conflict. This electroencephalography (EEG) finding, a posterior negativity, specifically reflects conflict at the task-set level, not response selection.

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Correlating Behavioral Responses to fMRI Signals from Human Prefrontal Cortex: Examining Cognitive Processes Using Task Analysis

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Published on: June 20, 2012

Area of Science:

Cognitive Neuroscience
Electrophysiology
Human Brain Activity

Background:

Neural correlates of response conflict are established, but those of task conflict remain unclear.
Previous studies suggest a poststimulus posterior negativity as a correlate of task conflict, but this could also reflect task-set reconfiguration.

Purpose of the Study:

To isolate and identify the electroencephalography (EEG) correlates of task conflict.
To differentiate neural activity associated with task conflict from response selection conflict.

Main Methods:

Participants performed single-task blocks involving letter and digit classification to minimize within-block task-set reconfiguration.
Event-related potentials (ERPs) were recorded while participants classified digits presented with letters or neutral symbols.
Behavioral responses and EEG data were analyzed to identify neural markers of conflict.

Main Results:

Presenting letters alongside digits slowed response times and elicited a posterior negativity in ERPs starting around 350 ms poststimulus.
This negativity was observed even with congruent digit-letter stimuli, suggesting conflict occurred earlier in processing.
The absence of behavioral response congruency effects further supported conflict at the task-set level.

Conclusions:

A distinct electrophysiological marker, a poststimulus posterior negativity, was identified for task conflict.
The findings indicate that this neural activity reflects conflict arising from the task set itself, rather than at the response selection stage.
This research clarifies the neural basis of task conflict, differentiating it from response conflict.