Dear experts,
I would like to get a second opinion on my model/contrasts before I run Stats to make sure it reflects my hypotheses...
I have 6EVS - 4 emotional facial expressions (EV1 anger, EV2 disgust, EV3 surprise, EV4 happiness) and control (EV5 neutral, EV6 moving object).
I want to find:
a) areas more active (and positive) for a given emotion than for control
b) areas more active (and positive) for at least one emotion than for control
c) areas more active (and positive) for all emotions than for control
d) focus on specific ROIs and find out which emotions activate them the most (> than all other emotions and control, and positive)
FIRST-LEVEL CONTRASTS
OC1 1 0 0 0 0 0
OC2 0 1 0 0 0 0
OC3 0 0 1 0 0 0
OC4 0 0 0 1 0 0
OC5 0 0 0 0 1 0
OC6 0 0 0 0 0 1
OC7 1 0 0 0 -1 -1
OC8 0 1 0 0 -1 -1
OC9 0 0 1 0 -1 -1
OC10 0 0 0 1 -1 -1
OC11 1 1 1 1 0 0
OC12 1 -1 -1 -1 -1 -1
OC13 -1 1 -1 -1 -1 -1
OC14 -1 -1 1 -1 -1 -1
OC15 -1 -1 -1 1 -1 -1
F1: OC1, OC2, OC3, OC4
F2: OC7, OC8, OC9, OC10
From my understanding:
a) (for anger): OC7 masked by OC1; (for disgust): OC8 masked by OC2 etc.
b) F2 masked by F1
c) OC11 masked by OC7 (already masked by OC1) and OC8, OC9, OC10
d) OC12 masked by OC1; OC13 masked by OC2 etc.
...while masking using Z>0 instead of Z stats pass thresholding.
Is any of this wrong?
Your help is greatly appreciated!
Best,
L.
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