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. Author manuscript; available in PMC: 2013 Jul 16.
Published in final edited form as: Neuroimage. 2012 Mar 30;61(4):1277–1286. doi: 10.1016/j.neuroimage.2012.03.068

Table 4.

Robustness of PPI Estimates and Significance: 3 Conditions, Fixation


Models
Model Parameters sPPI sPPI+tasks sPPIplus gPPI2 gPPI3
PPI Effect
PPIA=1; PPIB=0.75; PPIC=0 0.15 (0.02) 0.12 (0.02) 0.12 (0.01) 0.24 (0.01) 0.25 (0.01)
PPIA=1; PPIB=0.75;
PPIC=0.5
−0.02 (0.02) −0.06 (0.02) −0.06 (0.01) −0.12 (0.02) 0.25 (0.01)
PPIA=0.125; PPIB=-0.125;
PPIC=0
0.15 (0.01) 0.12 (0.01) 0.12 (0.01) 0.24 (0.01) 0.25 (0.01)
PPIA=0.125; PPIB=0.125;
PPIC=0.5
−0.03 (0.01) −0.06 (0.01) −0.06 (0.01) −0.13 (0.02) 0.25 (0.01)
No PPI Effect
PPIA=0;PPIB=0; PPIC=0 0.02 (0.01) −0.01 (0.01) −0.01 (0.01) −0.01 (0.01) 0.00 (0.01)
PPIA=0;PPIB=0; PPIC=0.5 −0.16 (0.01) −0.19 (0.01) −0.19 (0.01) −0.38 (0.02) 0.00 (0.01)
PPIA=0;PPIB=0; PPIC=−0.5 0.20 (0.01) 0.18 (0.01) 0.18 (0.01) 0.35 (0.01) 0.00 (0.01)

Values are the mean and standard errors across seed voxels. For PPI Effect models, bold values indicate tests that were significant for A>B at p<0.05. For No PPI Effect models, bold values indicate tests that were significant for A-B~=0 at p<0.05.