title: Analyzing task-dependent brain network changes by whole-brain psychophysiological interactions: a comparison to conventional analysis.
abstract: While fMRI activation studies contrasting task conditions regularly assess the whole brain, this is usually not true for studies analyzing task-dependent brain connectivity changes by psychophysiological interactions (PPI). Here we combine standard PPI (sPPI) and generalized PPI (gPPI) with a priori brain parcellation by spatially constrained normalized cut spectral clustering (NCUT) to analyze task-dependent connectivity changes in a whole brain manner, and compare the results to multiseed conventional PPI analyses over all activation peaks in an episodic memory recall task. We show that, depending on the chosen parcellation frame, the whole-brain PPI approach is able to detect a large amount of the information that is detected by the conventional approach. Over and above, whole-brain PPI allows identification of several additional task-modulated connections, particularly from seed regions without significant activation differences between conditions.
authors.affiliation: Department of Clinical Psychology, Central Institute of Mental Health, University of Heidelberg/Medical Faculty Mannheim, Mannheim, Germany; Bernstein Center for Computational Neuroscience Heidelberg/Mannheim, Mannheim, Germany.
authors.forename: Martin Fungisai
authors.initials: MF
authors.lastname: Gerchen
authors.forename: David
authors.initials: D
authors.lastname: Bernal-Casas
authors.forename: Peter
authors.initials: P
authors.lastname: Kirsch
mesh_terms: D000328:Adult; D001921:Brain / Q000098:blood supply* / Q000502:physiology*; D001931:Brain Mapping; D016000:Cluster Analysis; D005260:Female; D007839:Functional Laterality; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008297:Male; D011939:Mental Recall / Q000502:physiology; D008875:Middle Aged; D008959:Models, Neurological; D009434:Neural Pathways / Q000098:blood supply / Q000502:physiology; D010100:Oxygen / Q000097:blood; D011603:Psychophysiology; D055815:Young Adult
chemical_list: D010100:Oxygen
keywords: connectivity; connectome; episodic memory; functional magnetic resonance imaging; recall
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