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> b) Ignore my deriv and dispersion columns and just do the main > effects using t-tests on the HRFs? Just a reminder that doing the above can detect significant amplitude differences which are the result of a delay difference. For a discussion and alternative approach see: V. D. Calhoun, M. Stevens, G. D. Pearlson, and K. A. Kiehl, "FMRI Analysis With the General Linear Model: Removal of Latency-Induced Amplitude Bias by Incorporation of Hemodynamic Derivative Terms," NeuroImage, vol. 22, pp. 252-257, 2004.