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Activation detected during nose touching in a volunteer, following image realignment, with static distortion correction (A) and FID-navigated distortion correction (B). Activation is detected in the motor cortex, as expected with this paradigm. With static distortion correction, false positive activations are also detected in the frontal and posterior brain regions due to residual unwarping errors. FIDnav distortion correction successfully removes these false positive activations.
