Paper Info
Title
The neural mechanisms underlying internally and externally guided task selection.
Abstract
While some prior work suggests that medial prefrontal cortex (MFC) regions mediate freely chosen actions, other work suggests that the lateral frontal pole (LFP) is responsible for control of abstract, internal goals. The present study uses fMRI to determine whether the voluntary selection of a task in pursuit of an overall goal relies on MFC regions or the LFP. To do so, we used a modified voluntary task switching (VTS) paradigm, in which participants choose an individual task to perform on each trial (i.e., a subgoal), under instructions to perform the tasks equally often and in a random order (i.e. the overall goal). In conjunction, we examined patterns of activation in the face of irrelevant, but task-related external stimuli that might nonetheless influence task selection. While there was some evidence that the MFC was involved in voluntary task selection, we found that the LFP and anterior insula (AI) were crucial to task selection in the pursuit of an overall goal. In addition, activation of the LFP and AI increased in the face of environmental stimuli that might serve as an interfering or conflicting external bias on voluntary task choice. These findings suggest that the LFP supports task selection according to abstract, internal goals, and leaves open the possibility that MFC may guide action selection in situations lacking in such top-down biases. As such, the current study represents a critical step towards understanding the neural underpinnings of how tasks are selected voluntarily to enable an overarching goal.
Year
DOI
Venue
2014
10.1016/j.neuroimage.2013.08.047
NeuroImage
Keywords
Field
DocType
Executive function,Cognitive flexibility,Goal maintenance,Volition,fMRI
Frontal Pole,Anterior insula,Task switching,Prefrontal cortex,Psychology,Cognitive psychology,Cognitive flexibility,Stimulus (physiology),Action selection
Journal
Volume
ISSN
Citations 
84
1053-8119
4
PageRank 
References 
Authors
0.45
6
2
Name
Order
Citations
PageRank
Joseph M. Orr181.54
Marie T Banich2799.48