GIFT Course Lecture 6: Multi-group ICA. Vince D. Calhoun, Ph.D.
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1 GIFT Course Lecture 6: Multi-group ICA Vince D. Calhoun, Ph.D. Director, Medical Image Analysis Laboratory Olin Neuropsychiatry Research Center, Institute of Living Assistant Clinical Professor, Psychiatry Yale University School of Medicine X = A S Approaches Two separate ICA analyses Requires sanity checks and careful interpretations One ICA analysis Much easier to compare groups May make unrealistic assumptions about the two groups Two examples Fixed average spatial (FAS) analysis Separate ICA analyses (VM task) Soli Deo Gloria 2 1
2 Approach 1: Space varying only Soli Deo Gloria 3 Simulated Driving Paradigm * Drive Watch Soli Deo Gloria 4 2
3 Day 0 Practice to Asymptote Participants Good vision Otherwise healthy All right handed Light (<3x/week) drinkers Valid drivers license 190pf EtOH/orange juice Individualized to weight, age, sex, race (Kapur( Kapur) designed for 0.04% or 0.08%BAC Study Design Day 1 (low or high dose) Task Instructions Practice fmri Session 1 (1 hour) EtOH Administered 15 minute delay Breathalyzer 1 Task Instructions fmri Session 2 (1 hour) Breathalyzer 2 Day 2 (low or high dose) Task Instructions Practice fmri Session 1 (1 hour) EtOH Administered 15 minute delay Breathalyzer 1 Task Instructions fmri Session 2 (1 hour) Breathalyzer 2 Soli Deo Gloria 5 Fixed-average average-spatial analysis Spatial regression.to generate time courses Day 1 Sober Spatial Regression Compare Time courses - EtOH lo or hi Day 2 Sober ICA Spatial Regression Spatial Regression - - EtOH lo or hi Spatial Regression Soli Deo Gloria 6 3
4 H1: ICA Image and Time Course Results Soli Deo Gloria 7 SPM Results: Sober Soli Deo Gloria 8 4
5 SPM Results: Drive vs. Watch Non-Drug Drug SPM was used to analyze data by contrasting the active driving with w the watching condition followed by a random effects analysis (N=10, two scans per subject) Activations are presented in red, deactivations are presented in blue This method revealed similar but not identical areas as the ICA analysis, but did not separate them into various networks Soli Deo Gloria 9 Exponential Rate Parameter * P<0.005 Soli Deo Gloria 10 5
6 General Disruptive EtOH Affect ** P<0.001 Soli Deo Gloria 11 Behavioral Interactions Cereb -> p< Frontoparietal -> p<0.03 Soli Deo Gloria 12 6
7 Interpretation of Driving Results Error Monitoring & Inhibition motivation risk assessment internal space Exponential Decrease During Driving Low Order Visual High Order Visual visuomotor integration Driving Speed EtOH Time Over Max. Speed Vigilance spatial attention, monitoring dorsal visual stream ventral visual stream external space Decreased Only During Driving Motor Control gross motor control motor planning Motor Coordination fine motor control visuomotor integration Increased only during Driving Increased during Driving Increase less during Watching Visual Monitoring Increased during epoch transitions Soli Deo Gloria 13 Approach 2: Space and Time Varying Soli Deo Gloria 14 7
8 Soli Deo Gloria 15 Soli Deo Gloria 16 8
9 Subtractions Soli Deo Gloria 17 Conjunctions Soli Deo Gloria 18 9
10 Time Course comparisons Soli Deo Gloria 19 Sanity Checks Soli Deo Gloria 20 10
11 Soli Deo Gloria 21 Exploring all components Spatial correlation matrix. Soli Deo Gloria 22 11
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