Implementation of the meanlogratio for TFR

doc/changes/dev/14205.newfeature.rst

@@ -0,0 +1 @@
+Added ``meanlogratio`` baselining mode to :meth:`mne.time_frequency.EpochsTFR.apply_baseline` and related functions, by :newcontrib:`Virginie van Wassenhove`.

doc/changes/names.inc

@@ -476,6 +476,7 @@
 .. _Victor Férat: https://github.com/vferat
 .. _Victoria Peterson: https://github.com/vpeterson
 .. _Vincent Gao: https://github.com/gaoflow
+.. _Virginie van Wassenhove: https://brainthemind.com/virginie-van-wassenhove
 .. _Wei Xu: https://github.com/psyxw
 .. _Will Turner: https://bootstrapbill.github.io
 .. _Wouter Kroot: https://github.com/WouterKroot

doc/references.bib

@@ -1025,6 +1025,15 @@ @unpublished{KingEtAl2018
   note = {hal-01848442}
 }
 
+@article{KinleyEtAl2026,
+  author={Kinley, Isaac and Roberts, Reece P and Meltzer, Jed A and Addis, Donna Rose},
+  title={Spectral change or Jensen gap? Log-ratio baseline correction for time-frequency M/EEG is negatively biased},
+  journal={Journal of Neuroscience Methods},
+  pages={110826},
+  year={2026},
+  publisher={Elsevier}
+}
+
 @article{KnuutilaEtAl1993,
   author = {Knuutila, Jukka E. T. and Ahonen, Antti I. and Hämäläinen, Matti S. and Kajola, Matti J. and Laine, P. P. and Lounasmaa, Olli V. and Parkkonen, Lauri T. and Simola, Juha T. A. and Tesche, Claudia D.},
   doi = {10.1109/20.281163},

mne/baseline.py

@@ -15,7 +15,15 @@ def _log_rescale(baseline, mode="mean"):
         _check_option(
             "mode",
             mode,
-            ["logratio", "ratio", "zscore", "mean", "percent", "zlogratio"],
+            [
+                "logratio",
+                "ratio",
+                "zscore",
+                "mean",
+                "percent",
+                "zlogratio",
+                "meanlogratio",
+            ],
         )
         msg = f"Applying baseline correction (mode: {mode})"
     else:
@@ -35,21 +43,7 @@ def rescale(data, times, baseline, mode="mean", copy=True, picks=None, verbose=N
     times : 1D array
         Time instants is seconds.
     %(baseline_rescale)s
-    mode : 'mean' | 'ratio' | 'logratio' | 'percent' | 'zscore' | 'zlogratio'
-        Perform baseline correction by
-
-        - subtracting the mean of baseline values ('mean')
-        - dividing by the mean of baseline values ('ratio')
-        - dividing by the mean of baseline values and taking the log
-          ('logratio')
-        - subtracting the mean of baseline values followed by dividing by
-          the mean of baseline values ('percent')
-        - subtracting the mean of baseline values and dividing by the
-          standard deviation of baseline values ('zscore')
-        - dividing by the mean of baseline values, taking the log, and
-          dividing by the standard deviation of log baseline values
-          ('zlogratio')
-
+    %(baseline_mode)s
     copy : bool
         Whether to return a new instance or modify in place.
     picks : list of int | None
@@ -60,6 +54,10 @@ def rescale(data, times, baseline, mode="mean", copy=True, picks=None, verbose=N
     -------
     data_scaled: array
         Array of same shape as data after rescaling.
+
+    References
+    ----------
+    .. footbibliography::
     """
     if copy:
         data = data.copy()
@@ -114,6 +112,13 @@ def fun(d, m):
             d /= m
             np.log10(d, out=d)
 
+    elif mode == "meanlogratio":
+
+        def fun(d, m):
+            d /= m
+            np.log10(d, out=d)
+            d -= np.mean(d[..., imin:imax], axis=-1, keepdims=True)
+
     elif mode == "percent":
 
         def fun(d, m):

mne/minimum_norm/time_frequency.py

@@ -220,21 +220,7 @@ def source_band_induced_power(
         If a is None the beginning of the data is used and if b is None then b
         is set to the end of the interval. If baseline is equal to (None, None)
         all the time interval is used.
-    baseline_mode : 'mean' | 'ratio' | 'logratio' | 'percent' | 'zscore' | 'zlogratio'
-        Perform baseline correction by
-
-        - subtracting the mean of baseline values ('mean')
-        - dividing by the mean of baseline values ('ratio')
-        - dividing by the mean of baseline values and taking the log
-          ('logratio')
-        - subtracting the mean of baseline values followed by dividing by
-          the mean of baseline values ('percent')
-        - subtracting the mean of baseline values and dividing by the
-          standard deviation of baseline values ('zscore')
-        - dividing by the mean of baseline values, taking the log, and
-          dividing by the standard deviation of log baseline values
-          ('zlogratio')
-
+    %(baseline_mode_mn)s
     pca : bool
         If True, the true dimension of data is estimated before running
         the time-frequency transforms. It reduces the computation times
@@ -258,6 +244,10 @@ def source_band_induced_power(
         (n_vertices, n_frequencies, n_samples) if label=None or label=label.
         For lists of one or more labels, the induced power estimate has shape
         (n_labels, n_frequencies, n_samples).
+
+    References
+    ----------
+    .. footbibliography::
     """  # noqa: E501
     _check_option("method", method, INVERSE_METHODS)
 
@@ -648,21 +638,7 @@ def source_induced_power(
         and if b is None then b is set to the end of the interval.
         If baseline is equal to (None, None) all the time
         interval is used.
-    baseline_mode : 'mean' | 'ratio' | 'logratio' | 'percent' | 'zscore' | 'zlogratio'
-        Perform baseline correction by
-
-        - subtracting the mean of baseline values ('mean')
-        - dividing by the mean of baseline values ('ratio')
-        - dividing by the mean of baseline values and taking the log
-          ('logratio')
-        - subtracting the mean of baseline values followed by dividing by
-          the mean of baseline values ('percent')
-        - subtracting the mean of baseline values and dividing by the
-          standard deviation of baseline values ('zscore')
-        - dividing by the mean of baseline values, taking the log, and
-          dividing by the standard deviation of log baseline values
-          ('zlogratio')
-
+    %(baseline_mode_mn)s
     pca : bool
         If True, the true dimension of data is estimated before running
         the time-frequency transforms. It reduces the computation times
@@ -692,6 +668,10 @@ def source_induced_power(
     plv : array
         The phase-locking value array with shape (n_sources, n_freqs,
         n_samples). Only returned if ``return_plv=True``.
+
+    References
+    ----------
+    .. footbibliography::
     """  # noqa: E501
     _check_option("method", method, INVERSE_METHODS)
     _check_ori(pick_ori, inverse_operator["source_ori"], inverse_operator["src"])

mne/time_frequency/tests/test_tfr.py

@@ -1723,7 +1723,8 @@ def test_tfr_copy(average_tfr):
 
 
 @pytest.mark.parametrize(
-    "mode", ("mean", "ratio", "logratio", "percent", "zscore", "zlogratio")
+    "mode",
+    ("mean", "ratio", "logratio", "meanlogratio", "percent", "zscore", "zlogratio"),
 )
 def test_tfr_apply_baseline(average_tfr, mode):
     """Test TFR baselining."""

mne/time_frequency/tfr.py

@@ -1793,26 +1793,17 @@ def apply_baseline(self, baseline, mode="mean", verbose=None):
         %(baseline_rescale)s
 
             How baseline is computed is determined by the ``mode`` parameter.
-        mode : 'mean' | 'ratio' | 'logratio' | 'percent' | 'zscore' | 'zlogratio'
-            Perform baseline correction by
-
-            - subtracting the mean of baseline values ('mean')
-            - dividing by the mean of baseline values ('ratio')
-            - dividing by the mean of baseline values and taking the log
-              ('logratio')
-            - subtracting the mean of baseline values followed by dividing by
-              the mean of baseline values ('percent')
-            - subtracting the mean of baseline values and dividing by the
-              standard deviation of baseline values ('zscore')
-            - dividing by the mean of baseline values, taking the log, and
-              dividing by the standard deviation of log baseline values
-              ('zlogratio')
+        %(baseline_mode)s
         %(verbose)s
 
         Returns
         -------
         %(inst_tfr)s
             The modified instance.
+
+        References
+        ----------
+        .. footbibliography::
         """
         self._baseline = _check_baseline(baseline, times=self.times, sfreq=self.sfreq)
         rescale(self.data, self.times, self.baseline, mode, copy=False, verbose=verbose)
@@ -1950,7 +1941,7 @@ def plot(
         %(baseline_rescale)s
 
             How baseline is computed is determined by the ``mode`` parameter.
-        %(mode_tfr_plot)s
+        %(baseline_mode)s
         %(dB_tfr_plot)s
         %(combine_tfr_plot)s
 
@@ -2216,7 +2207,7 @@ def plot_joint(
         %(baseline_rescale)s
 
             How baseline is computed is determined by the ``mode`` parameter.
-        %(mode_tfr_plot)s
+        %(baseline_mode)s
         %(dB_tfr_plot)s
         %(yscale_tfr_plot)s
         %(vlim_tfr_plot_joint)s
@@ -2514,7 +2505,7 @@ def plot_topo(
         %(baseline_rescale)s
 
             How baseline is computed is determined by the ``mode`` parameter.
-        %(mode_tfr_plot)s
+        %(baseline_mode)s
         %(tmin_tmax_psd)s
         %(fmin_fmax_tfr)s
         %(vmin_vmax_tfr_plot_topo)s

mne/utils/docs.py

@@ -511,6 +511,37 @@ def _reflow_param_docstring(docstring, has_first_line=True, width=75):
     2. Subtract this mean from the **entire** ``Evoked``.
 
 """
+_baseline_mode_desc = """\
+    Perform baseline correction by:
+
+    ``"mean"``
+      Subtracting the mean of baseline values
+    ``"ratio"``
+      Dividing by the mean of baseline values
+    ``"logratio"``
+      Dividing by the mean of baseline values and taking the log
+    ``"meanlogratio"``
+      Dividing by the mean of baseline values, taking the log and then
+      subtracting the mean (:footcite:`KinleyEtAl2026`)
+
+      .. note:: this baseline mode has not been tested at the source-level!
+    ``"percent"``
+      Subtracting the mean of baseline values followed by dividing by
+      the mean of baseline values
+    ``"zscore"``
+      Subtracting the mean of baseline values and dividing by the
+      standard deviation of baseline values
+    ``"zlogratio"``
+      Dividing by the mean of baseline values, taking the log, and
+      dividing by the standard deviation of log baseline values
+"""
+
+docdict["baseline_mode"] = f"""\
+mode : 'mean' | 'ratio' | 'logratio' | 'meanlogratio' | 'percent' | 'zscore' | 'zlogratio'
+{_baseline_mode_desc}"""  # noqa: E501
+docdict["baseline_mode_mn"] = f"""\
+baseline_mode : 'mean' | 'ratio' | 'logratio' | 'meanlogratio' | 'percent' | 'zscore' | 'zlogratio'
+{_baseline_mode_desc}"""  # noqa: E501
 
 docdict["baseline_report"] = f"""{_baseline_rescale_base}
     Correction is applied in the following way **to each channel:**
@@ -2825,23 +2856,6 @@ def _reflow_param_docstring(docstring, has_first_line=True, width=75):
     * 'sum' : Sum of PSFs/CTFs across vertices.
 """
 
-docdict["mode_tfr_plot"] = """
-mode : 'mean' | 'ratio' | 'logratio' | 'percent' | 'zscore' | 'zlogratio'
-    Perform baseline correction by
-
-    - subtracting the mean of baseline values ('mean') (default)
-    - dividing by the mean of baseline values ('ratio')
-    - dividing by the mean of baseline values and taking the log
-      ('logratio')
-    - subtracting the mean of baseline values followed by dividing by
-      the mean of baseline values ('percent')
-    - subtracting the mean of baseline values and dividing by the
-      standard deviation of baseline values ('zscore')
-    - dividing by the mean of baseline values, taking the log, and
-      dividing by the standard deviation of log baseline values
-      ('zlogratio')
-"""
-
 docdict["montage"] = """
 montage : None | str | DigMontage
     A montage containing channel positions. If a string or

mne/viz/topomap.py

@@ -2065,20 +2065,7 @@ def plot_tfr_topomap(
         "b (s)". If a is None the beginning of the data is used and if b is
         None then b is set to the end of the interval. If baseline is equal to
         (None, None) the whole time interval is used.
-    mode : 'mean' | 'ratio' | 'logratio' | 'percent' | 'zscore' | 'zlogratio' | None
-        Perform baseline correction by
-
-          - subtracting the mean baseline power ('mean')
-          - dividing by the mean baseline power ('ratio')
-          - dividing by the mean baseline power and taking the log ('logratio')
-          - subtracting the mean baseline power followed by dividing by the
-            mean baseline power ('percent')
-          - subtracting the mean baseline power and dividing by the standard
-            deviation of the baseline power ('zscore')
-          - dividing by the mean baseline power, taking the log, and dividing
-            by the standard deviation of the baseline power ('zlogratio')
-
-        If None no baseline correction is applied.
+    %(baseline_mode)s
     %(sensors_topomap)s
     %(show_names_topomap)s
     %(mask_evoked_topomap)s
@@ -2119,6 +2106,10 @@ def plot_tfr_topomap(
     -------
     fig : matplotlib.figure.Figure
         The figure containing the topography.
+
+    References
+    ----------
+    .. footbibliography::
     """  # noqa: E501
     import matplotlib.pyplot as plt