A Task-Based Functional MRI Double Dissociation of Visual Language and Feature Processing in Healthy Adults
AI Summary
Double dissociation between Focus on Visual Features (FoVF) and Language (LAN): FoVF activated in Coherence task, LAN activated in Semantic task.
Analysis used finite impulse response multivariate multiple regression with whole-brain dimensionality reduction on 10 participants scanned across 10 sessions.
Default mode network exhibited task-related deactivation during both Coherence and Semantic conditions, supporting distinct temporal-functional cognitive modes.
BACKGROUND/PURPOSE: Task-based functional MRI (fMRI) can identify spatial and temporal brain configurations of blood-oxygen-level-dependent (BOLD) activity for dissociable cognitive functions. Evidence for the discriminability of spatial/temporal/functional combinations (i.e., cognitive modes) can be achieved through the dissociation of task-based BOLD signal changes following whole-brain dimension reduction. A double dissociation can be achieved by task-induced BOLD-change activation of mode A in condition A but not B, and vice versa for activation in mode B. In this study, we analyzed the Coherence-Semantic task from the Midnight Scan Club dataset to test for a double dissociation of Focus on Visual Features (FoVF) from Language (LAN) modes.
METHODS: The Coherence-Semantic task involved 10 healthy participants scanned over 10 sessions on a 3-Tesla MRI scanner. The task included (1) identifying coherent or random movements of dots (Coherence condition) and (2) identifying a noun versus a verb (Semantic condition). fMRI data were analyzed by combining finite impulse response multivariate multiple regression with whole-brain dimensionality reduction. The dissociations were evaluated at the level of subject-specific task-induced BOLD changes using repeated-measures ANOVAs comparing the Coherence and Semantic conditions.
RESULTS: A double dissociation was observed: FoVF showed task-induced increases in BOLD activation during the Coherence condition, with no significant task-related activation during the Semantic condition, and vice versa for LAN. The default mode (DM) also showed task-related deactivation in both conditions.
CONCLUSIONS: This double dissociation provides evidence for the temporal and functional discriminability of FoVF and LAN, contributing to evidence supporting the discriminability of cognitive modes detectable by fMRI.
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