Dear Vincent,
This contrast is not estimable as there is multicollinearity in your
design, as shown by the grey boxes above 'parameter estimability'.
I guess that the onset times for A1_W and OC_W are identical, idem for
A1_L and OC_L: is this by mistake or what are you trying to do?
Best regard,
Guillaume.
On 07/02/18 13:10, Vincent Yeo wrote:
> Dear experts,
>
> I encountered a problem with the 1st-level analysis. I firstly generate the multiple conditions file using the following script:
>
> onsets = {A1_W_ons A1_L_ons OC_W_ons OC_L_ons A2ons};
> names = {'A1_W' 'A1_L' 'OC_W' 'OC_L' 'A2'};
> durations = {0 0 0 0 0};
> pmod(1).name{1} = 'A1_WP'; pmod(1).param{1} = AWP; pmod(1).poly{1} = 1;
> pmod(2).name{1} = 'A1_LP'; pmod(2).param{1} = ALP; pmod(2).poly{1} = 1;
> pmod(3).name{1} = 'OC_WP1'; pmod(3).param{1} = OWP1; pmod(3).poly{1} = 1;
> pmod(3).name{2} = 'OC_WP2'; pmod(3).param{2} = OWP2; pmod(3).poly{2} = 1;
> pmod(4).name{1} = 'OC_LP1'; pmod(4).param{1} = OLP1; pmod(4).poly{1} = 1;
> pmod(4).name{2} = 'OC_LP2'; pmod(4).param{2} = OLP2; pmod(4).poly{2} = 1;
>
> Here I have five conditions. A1_W and A1_L have 1 parameter, OC_W and OC_L have 2 parameters, and A2 has no parameter. Moreover, I included the time derivatives and head-motion data in my model (please see the attached "model2_design" for more details).
>
> My script successfully completed the "fMRI model specification" and "Model estimation", but reported an error when doing "Contrast Manager" as follows:
>
> Contrasts folder : .\try\Sub110\results\model3
> 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 <- !invalid contrast
> Failed 'Contrast Manager'
> Error using spm_run_con (line 249)
> Error in contrast specification
> In file "E:\Matlab_toolbox\spm12\config\spm_run_con.m" (v6764), function "spm_run_con" at line 249.
>
> I would really appreciate it if you could help me solve the problem.
>
> Best,
> Vincent
>
--
Guillaume Flandin, PhD
Wellcome Trust Centre for Neuroimaging
University College London
12 Queen Square
London WC1N 3BG
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