A study conducted by Tobias Egner and Joy Hirsch focuses on ways through which humans can make rapid strategic adjustments within the environment
A study conducted by Tobias Egner and Joy Hirsch focuses on ways through which humans can make rapid strategic adjustments within the environment using the anterior cingulate cortex that signals responses to the dorsolateral prefrontal cortex to achieve cognition effectively. The authors focus on understanding whether tasks such as the Stoop protocol would require conflict resolution through modulation of the excitatory information, its inhibition or a combination of both the implication and inhibition processes. The study aims at complementing the understanding of cognitive control through the revelation of the important aspects of the biasing process. The main study question is what selection mechanism can cause rapid online performance adjustments that arise from the dorsolateral prefrontal cortex of the subject that performs an ongoing task. This research question is important in helping the researchers understand how conflict adaptation may develop in the task being done and how it can be used as a model for improving and regulation of attention that eventually helps in optimizing task performances.
The researchers understand that conflict adaptation is a model that can be used to regulate attention when handling tasks in real-life situations, and this is the theory that they use to guide the research. Their hypothesis, therefore, is that conflict monitoring and cognitive control model may predict whether the transient modulation of target feature processing is directly related to the input that emerges from the cognitive control loci in the dorsolateral prefrontal cortex. The hypothesis was justified though measuring the cortex sensitive functional interrogation in the FFA and functionally defined ones in the right DLPFC, as well as those in the right superior temporal cortex and the left insula. Hence, the authors found out that the modulation in the FFA was mediated in a top-down biasing signal, and that the DLPFC had a sub-region which had test and control dependent functionality with the FFA.
The researchers used trial by trial levels of conflict and control while conducting a Stoop task. Face stimuli were implemented, and the hemodynamic responses were then recorded from the visual cortex of the participants. A total of 22 subjects were recruited and allowed to sign a consent form for the research. The face stimuli were used as either a distraction or target to obtain FFA responses which were then recorded in terms of dimensions for varying cognitive control levels. In the design, subjects were made to discriminate between actors and political figures. This was based on face stimulus or a written name. The stimulus was then made to be either category congruent or category incongruent, and the trials were given out pseudo-randomly.
From the research design, the subjects were allowed to categorize stimuli that consisted of faces of actors that were familiar and those of politicians. These were categorized as either category congruent or incongruent. The analysis was then done based on previous and current trial congruency. It then emerged that reaction times for correct trials revealed Stoop-like interference effects from the incongruent distractors and the face distractor conditions. However, for the face-target task, the reaction time to incongruent stimuli was faster for high control conditions as compared to low control conditions. Besides, when the face was made to serve as stimuli, the authors found out that conduct adaptation was evident in FFA. Hence, the authors realized that FFA responses in incongruent trials were greatly enhanced in high control conditions than in low control conditions. These results supported the hypothesis.
Hence, the authors concluded that when there is high conflict, cognitive mechanisms are capable of enhancing performance through transient amplification of cortical responses to task-relevant information and not by inhibiting responses to task-irrelevant information. As such, the authors realized that performing classic selective attention tasks could be accounted for without necessarily invoking mechanisms that actively inhibit the processing to task-irrelevant stimulus features. As such, the perpetual suppression distracter information may not be possible unless, under highly demanding conditions, the attentional resources are bound to target information. The weakness of the study is that it heavily relies on whether conflict adaptation is a true reflection of conflict-driven adjustments within cognitive control. Also, the study was not confounded with repetition priming effects. Hence, the existence of higher priming effects could lead to different results.