title: Predicting effective connectivity from resting-state networks in healthy elderly and patients with prodromal Alzheimer's disease.
abstract: Using functional neuroimaging techniques two aspects of functional integration in the human brain have been investigated, functional connectivity and effective connectivity. In this study we examined both connectivity types in parallel within an executive attention network during rest and while performing an attention task. We analyzed the predictive value of resting-state functional connectivity on task-induced effective connectivity in patients with prodromal Alzheimer's disease (AD) and healthy elderly. We found that in healthy elderly, functional connectivity was a significant predictor for effective connectivity, however, it was frequency-specific. Effective top-down connectivity emerging from prefrontal areas was related with higher frequencies of functional connectivity (e.g., 0.08-0.15 Hz), in contrast to effective bottom-up connectivity going to prefrontal areas, which was related to lower frequencies of functional connectivity (e.g., 0.001-0.03 Hz). In patients, the prediction of effective connectivity by functional connectivity was disturbed. We conclude that functional connectivity and effective connectivity are interrelated in healthy brains but this relationship is aberrant in very early AD.
authors: Department of Neuroradiology, Klinikum Rechts der Isar, Technical University Munich, Ismaningerstrasse 22, 81675 Munich, Germany.
authors: Susanne
authors: S
authors: Neufang
authors: Atae
authors: A
authors: Akhrif
authors: Valentin
authors: V
authors: Riedl
authors: Hans
authors: H
authors: Förstl
authors: Alexander
authors: A
authors: Kurz
authors: Claus
authors: C
authors: Zimmer
authors: Christian
authors: C
authors: Sorg
authors: Afra M
authors: AM
authors: Wohlschläger
mesh_terms: D000368:Aged; D000375:Aging / Q000502:physiology; D000544:Alzheimer Disease / Q000503:physiopathology*; D000956:Antigens, Viral; D001288:Attention / Q000502:physiology; D060825:Cognitive Dysfunction / Q000503:physiopathology*; D063132:Connectome / Q000295:instrumentation / Q000379:methods*; D018450:Disease Progression; D056344:Executive Function / Q000502:physiology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D009415:Nerve Net / Q000503:physiopathology*; D017397:Prefrontal Cortex / Q000503:physiopathology*; D062706:Prodromal Symptoms; D011379:Prognosis; D011597:Psychomotor Performance / Q000502:physiology; D012146:Rest / Q000502:physiology
chemical_list: D000956:Antigens, Viral; C030663:FMR antigen
keywords: effective connectivity; executive attention network; prodromal Alzheimer's disease; resting-state functional connectivity