marginally significantp = 0.059
There were also marginally significant decision * optode region * up–down placement [ F (3, 30) = 2.765, p = 0.059]; optode region * left–right * up–down placements [ F (1, 32) = 3.431, p = 0.073]; and for decision * optode region * left–right * up–down placements interactions [ F (3, 30) = 2.758, p = 0.060]. 3.1.3 Tests of within-subjects effects The results of tests of within-subjects effects indicate that there was a main effect for the optode region [ F (2.646, 84.675) = 5.392, p = 0.002].