hello everyone in an article, I read this. ..the regressor was generated by convolving a cannonical hemodynamic response function with a dummy variable that equaled 1 during A epochs for trials in which the early reward option available immediately, equaled -0.5 during decision epochs in which the early reward was available only with a delay, and equaled zero during baseline period. I don't know what this exactly means, and how make it in the SPM software. Can anyone help me? -- Yangyang Zhang, Ph.D.c Key Laboratory of Behavioral Science Institute of Psychology, Chinese Academy of Sciences 16 Lincui Road, Chaoyang District, Beijing (100101), P.R.China Email: [log in to unmask]