Dear Dr. McLaren,

Thank you very much for your prompt and helpful reply.

According to SPM.xX.name, as you point out, prefix "PPI_" is added to condition only.
For example, if I add the prefix "PPI_" to the name manually-created PMs when I run a SPM first-level analysis (not first-level PPI), can the code catch the prefix?

I have attached a SPM.mat file for reference. There are one condition ("Cue") and two manually-created PMs ("w" and "DotNumber").

Best regards,

Yukiko