A fast optical imaging study of frontoparietal preparatory dynamics in response-mode switching

Coordination between networks of brain regions is important for optimal cognitive performance, especially in attention demanding tasks. With the event-related optical signal (EROS; a measure of changes in optical scattering due to neuronal activity) we can characterize rapidly evolving network processes by examining the millisecond-scale temporal correlation of activity in distinct regions during the preparatory period of a response-mode switching task. Participants received a pre-cue indicating whether to respond vocally or manually. They then saw or heard the letter “L” or “R”, indicating a “left” or “right” response to be implemented with the appropriate response modality. We employed lagged cross-correlations to characterize the dynamic connectivity of preparatory processes. Our results confirmed coupling of frontal and parietal cortices, and the trial-dependent relationship of the right frontal cortex with response preparation areas. The frontal-to-modality-specific cortex cross-correlations revealed a pattern in which first irrelevant regions were deactivated and then relevant regions were activated. These results provide a window into the sub-second-scale network interactions that flexibly tune to task demands.

Name thesis:degree_name

M.A.

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Psychology

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2013

Author dc:creator

• Baniqued, Pauline

Contributors dc:contributor

• Fabiani, Monica
• Gratton, Gabriele

• frontoparietal network
• task switching
• response preparation
• executive control
• functional connectivity
• optical imaging
• event-related brain potentials

Statement dc:rights

• This work is a preprint version of an article that has been accepted for publication in the Journal of Cognitive Neuroscience: Baniqued, P.L., Low, K.A., Fabiani, M., Gratton, G. Frontoparietal traffic signals: A fast optical imaging study of preparatory dynamics in response-mode switching.

Language dc:language

en

Handle dc:identifier

http://hdl.handle.net/2142/42453

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/42453