Model Specification and the Reliability of fMRI Results: Implications for Longitudinal Neuroimaging Studies in Psychiatry
Figure 2
Task Related Neural Activity at Time 2.
Plotted values represent t-statistics from the emotional-faces-minus-shapes contrast during the second testing occasion. Default pipeline: data were modeled as a block-design with a canonical hemodynamic response function (HRF); Flexible HRF pipeline: data were modeled as a mixed block/event design and temporal and dispersion derivatives were added to the design matrix as additional basis functions; mCompCor pipeline: data were modeled as a block design and a additional regressor was added to the design matrix to account for physiological noise in the global signal; Combined Flexible HRF and mCompCor pipeline: data were modeled as a mixed block/event design and both the Flexible HRF and mCompCor components were implemented.