Dear Christopher,
please check if your parameters really vary for the critical sessions or
have the same value for all trials of this condition.
Michael.
Am 19.02.2010 17:17, schrieb Christopher Benjamin:
> Dear SPM ninjas
>
> We have a problem with a first level model (see attached design matrix). We
> specify a model containing 4 sessions. Each has 2 conditions with a series
> of parametric modulations. After specification, the design matrix reveals 3
> greyed (“not uniquely specified”) regressors.
>
> The the grey regressors occur in the parametric modulations, and are the
> last regressor in the third session and the last 2 parameters of the fourth
> session.
>
> When the .mat file is checked, all the regressor values appear correct and
> appear to be uniquely specified.
>
> Any help would be much appreciated!
>
> Cheers
>
> Chris
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Dr. Michael Erb
Sektion f. experimentelle Kernspinresonanz des ZNS
Abteilung Neuroradiologie, Universitaetsklinikum
Hoppe-Seyler_Str. 3, D-72076 Tuebingen
Tel.: +49(0)7071/2987753 priv. +49(0)7071/61559
Fax.: +49(0)7071/294371
e-mail: <[log in to unmask]>
www: http://www.medizin.uni-tuebingen.de/nrad/sektion/
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