From 96f1033b5aa567b39f5a338683ca82d69c73ebe0 Mon Sep 17 00:00:00 2001
From: Eric Condamine <37933899+servoz@users.noreply.github.com>
Date: Fri, 15 May 2020 12:11:27 +0200
Subject: [PATCH] volterra_expansion_order documentation error

For fMRI model specification, in SPM, matlabbatch{n}.spm.stats.fmri_spec.volt = 2 corresponds to 'Model Interactions' and matlabbatch{n}.spm.stats.fmri_spec.volt =1 corresponds to 'Do not model Interactions'.
Currently, for the corresponding process in nipype, the Level1Design, we see volterra_expansion_order = traits.Enum(1, 2, field="volt", desc=("Model interactions - yes:1, no:2")).
I guess the correct description should rather be volterra_expansion_order = traits.Enum(1, 2, field="volt", desc=("Model interactions - no:1, yes:2"))
---
 nipype/interfaces/spm/model.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nipype/interfaces/spm/model.py b/nipype/interfaces/spm/model.py
index 2d09f23e90..de6dc15216 100644
--- a/nipype/interfaces/spm/model.py
+++ b/nipype/interfaces/spm/model.py
@@ -81,7 +81,7 @@ class Level1DesignInputSpec(SPMCommandInputSpec):
         mandatory=True,
     )
     volterra_expansion_order = traits.Enum(
-        1, 2, field="volt", desc=("Model interactions - yes:1, no:2")
+        1, 2, field="volt", desc=("Model interactions - no:1, yes:2")
     )
     global_intensity_normalization = traits.Enum(
         "none",