Multisubject Decomposition of Event-related Positivities in Cognitive Control: Tackling Age-related Changes in Reactive ControlEnriquez-Geppert, S. & Barceló, F., Jan-2018, In : Brain Topography. 31, 1, p. 17-34 19 p.
Research output: Contribution to journal › Article › Academic › peer-review
Age-related neurocognitive effects have been observed at different levels ranging from reduced amplitudes of even-related potentials and brain oscillations, to topography changes of brain activity. However, their association remains incompletely understood. We investigated time-frequency and time-course effects in functional networks underlying the P300 and their involvement in reactive control. Electroencephalographic (EEG) data of three different age groups (30 young: 18-26 years, 30 mid-aged: 49-58 years, 30 elderly: 65-75 years) was measured while they performed a cued colour/thickness switching task. Neural data was analysed concerning the targets. To consider restart, mixing, and switching processes, the targets´ position after a cue (first or third target) as well as their context in the single-task (distractor cue) or the mixed-task block (switch- or repeat cue) was analysed. P300 EEG data was decomposed by means of group-independent component and time-frequency analyses focusing on theta and beta oscillations. RTs generally slowed down with age (main effect group), and effects were specifically strong in targets after a switching cue (larger Cohens d). Peaking at around 300 ms, we detected five functionally independent networks reflecting the multicomponent process underlying task-switching. These networks differed in terms of their topography (parietal and frontal), their involvement in task processes (switch-specific, mixing-, restart-, and single-task processes) and in terms of frequency effects. All were affected by age, as indicated by amplitude changes of the target-P300 and power reductions most consistently shown in beta oscillations. Most extensive age-related changes were observed in one parietal network sensitive to mixing and restart processes. Changes included a topography shift, P300 and beta amplitudes, and were ongoing in the elderly group.
|Number of pages||19|
|Early online date||13-Aug-2016|
|Publication status||Published - Jan-2018|
- MIXING COST, IN-VITRO, INDEPENDENT COMPONENT ANALYSIS, LATENT-VARIABLE ANALYSIS, TASK-SWITCHING PARADIGM, FRONTAL-MIDLINE THETA, OLDER-ADULTS, EXECUTIVE FUNCTION, MEMORY TASK, INSTRUMENTAL ACTIVITIES