Non-specific increase in alpha power during a neurofeedback session targeting its downregulation.
The 11 matches
- [1] § Method › Material and neurofeedback implementation ↔ material/IAN_gencondorder.m, lines 1–19 · score 0.90 · Latin square design, possible triplets, EEG NF session, feedback update, counterbalance, training blocks
- [2] § Method › EEG offline processing ↔ EEG offline analyses/pret3/IAN_1data_filter.m, lines 1–25 · score 0.83 · zero phase filtered, notch filter, high pass filter, IIR, Butterworth, offline
- [3] § Method › EEG offline processing ↔ EEG offline analyses/t3/IAN_5pwr.m, lines 1–25 · score 0.83 · pspectrum function, 12–15 Hz, 15–30 Hz, 8–12 Hz, spectral power, signal
- [4] § Method › EEG offline processing ↔ EEG offline analyses/t3/IAN_5pwr.m, lines 1–25 · score 0.81 · 12–15 Hz, 15–30 Hz, 8–12 Hz, Matlab R2023a, spectral power, 4–8 Hz
- [5] § Method › Statistical analyses and hypotheses testing › EEG data ↔ statistical analyses/IAN_BFsynth.R, lines 1–53 · score 0.77 · multilevel models, brms syntax, full model, Bayesian, training, blocks
- [6] § Method › Statistical analyses and hypotheses testing › EEG data ↔ statistical analyses/IAN_BFsynth_wf.R, lines 1–41 · score 0.76 · multilevel models, brms syntax, full model, Bayesian, blocks, Sham
- [7] § Method › EEG offline processing ↔ EEG offline analyses/pret3/IAN_3runICA.m, lines 1–22 · score 0.76 · eye blink, EEGLAB, ICA, Infomax, movement, Component
- [8] § Method › EEG online processing ↔ EEG offline analyses/pret3/IAN_1data_filter.m, lines 1–25 · score 0.72 · zero phase filtering, Matlab R2023a, IIR, Butterworth, filtfilt, window
- [9] § Method › EEG offline processing ↔ EEG offline analyses/t3/IAN_6zscore.m, lines 10–50 · score 0.64 · 12–15 Hz, 15–30 Hz, 8–12 Hz, 4–8 Hz, frequency bands, Offline
- [10] § Method › EEG offline processing ↔ EEG offline analyses/t3/IAN_6zscore.m, lines 10–50 · score 0.63 · 12–15 Hz, 15–30 Hz, 8–12 Hz, 4–8 Hz, frequency bands, beta
- [11] § Method › Statistical analyses and hypotheses testing › EEG data ↔ statistical analyses/IAN_mainplots.R, lines 277–327 · score 0.50 · trial repetition, transfer block, frequency bands, Alpha power, variables, electrodes
Paper
Loaded from Europe PMC by your browser, not stored by OSCR: doi.org · Europe PMC
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The authors' code
MATLAB · 265 lines · 9.2 KB · no license · 2 matches
- %% ------------------------------------------------------ IAN_1data_filter
- % This script applies offline an IIR high-pass filter (Butterworth, 6th order), and
- % a Notch filter at 50 Hz on the raw data (four dimensions matrix for:
- % 1) electrod position ; 2) data sample; 3) trial; 4) block).
- % Each trial initially lasts 63 secondes. Each operation is done on each
- % trial. First the script plots each trial raw data of each channel.
- % Second, the script doubles the last second at the end the recording.
- % This is done in order to, after filtering data (3rd step), remove the
- % filter transients by deleting the first two and the last seconds. At the
- % same time, data are reorganized into one single multidimensional matrix:
- % 1. Electrods positions
- % 2. Data samples
- % 3. Trials
- % 4. Blocks
- % 5. Subjects
- % Finally, filtered data of each channel are plotted.
- %
- % NB: Using the function 'filtfilt' doubles the filter order, but avoids
- % the associated phase/filter delay. For more information, see the
- % MATLAB documentation about this function. == zero-phase filtering
- %----------- Anonymised for PR, last update on April 11th, 2025 ------------------
- % This script has been written on MATLAB R2023a on WINDOWS 10.
- clear;clc;close all force;
- %% Define parameters and filter coefficients
- %-- Frequency sample in Hz (250 Hz)
- fs = 250;
- %-- Cut-off frequencies for the high-pass filter in Hz
- fch1 = 0.5./(fs/2); % normalized for the butter function syntax
- %-- Filters coefs
- % High pass Butterworth
- [b, a] = butter(6,fch1,'high');
- % Notch filter at 50 Hz
- wo = 50/(fs/2);
- bw = wo/35;
- [bn,an] = iirnotch(wo,bw);
- %-- Electrods column codes
- Fp1 = 1;
- Fpz = 2;
- Fp2 = 3;
- Fz = 4;
- Cz = 5;
- Pz = 6;
- %-- Trials initial length (in secs)
- dur_max = 63;
- %-- Define initial time vector for raw data
- t = 1/fs:1/fs:dur_max; t = t-3;
- %-- Define a new time vector for filtered data
- tfilt = 1/fs:1/fs:dur_max-3;
- %-- Define matrix dimensions
- ne = 6; % nb of electrods
- ns = length(tfilt); % nb of samples
- n = input("What is the number of subjects so far? "); % nb of participants
- nt = 8; % nb of trials
- nc = 4; % nb of blocks
- %-- Load block order vector to retrieve participants' one
- load("XXXX\material\cond_order.mat")
- %-- Initiate or Load multidimensional matrix to organize raw data
- % Dimensions:
- % 1. Electrods positions
- % 2. Data samples
- % 3. Trials
- % 4. Blocks
- % 5. Subjects
- if exist(join(['XXXX\data\EEG processed',filesep,"data_1raw.mat"],''),"file")
- load("XXXX\data\EEG processed\data_1raw.mat");
- %-- Determine from which subject to begin filtering
- i_start = size(data_1raw,5)+1;
- if i_start > n
- i_start = n;
- end
- %-- Preallocate more length to dimension subject
- for i = i_start:n
- data_1raw(:,:,:,:,i) = zeros(ne,length(t),nt,nc); %#ok<SAGROW>
- end
- else
- data_1raw = zeros(ne,length(t),nt,nc,n);
- i_start = 1;
- end
- %-- Initiate or Load multidimensional matrix to store filtered data
- % Dimensions:
- % 1. Electrods positions
- % 2. Data samples
- % 3. Trials
- % 4. Blocks
- % 5. Subjects
- if i_start == 1
- data_2filt = zeros(ne,ns,nt,nc,n);
- else
- load("XXXX\data\EEG processed\data_2filt.mat");
- end
- %% Visualize raw data in the time domain
- % %----- Electrode level loop
- % for e = 1:ne
- % %----- Subject level loop
- % for i = 25:n
- %
- % %-- Get participant block order
- % g = cond_order(:,i);
- %
- % %-- Load corresponding data
- % if i < 10
- % load(join(["data_1raw",filesep,"IAN0",i,"_",join(num2str(g)',''),".mat"],''));
- % else
- % load(join(["data_1raw",filesep,"IAN",i,"_",join(num2str(g)',''),".mat"],''));
- % end
- %
- % %-- Create a figure for each electrod
- % if e == Fz
- % f1 = figure('NumberTitle','off','Name',join(['S' string(i) ' data at Fz'],''));
- % f1.WindowState = "maximized";
- % elseif e == Fp1
- % f1 = figure('NumberTitle','off','Name',join(['S' string(i) ' data at Fp1'],''));
- % f1.WindowState = "maximized";
- % elseif e == Fpz
- % f1 = figure('NumberTitle','off','Name',join(['S' string(i) ' data at Fpz'],''));
- % f1.WindowState = "maximized";
- % elseif e == Fp2
- % f1 = figure('NumberTitle','off','Name',join(['S' string(i) ' data at Fp2'],''));
- % f1.WindowState = "maximized";
- % elseif e == Cz
- % f1 = figure('NumberTitle','off','Name',join(['S' string(i) ' data at Cz'],''));
- % f1.WindowState = "maximized";
- % else
- % f1 = figure('NumberTitle','off','Name',join(['S' string(i) ' data at Pz'],''));
- % f1.WindowState = "maximized";
- % end
- % %----- Block level loop
- % for j = 1:nc
- % %----- Trial level loop
- % for k = 1:nt
- % subplot(nc,nt,j*nt-nt+k)
- % plot(t,eeg_data(e,:,k,j))
- % xlim([min(t) max(t)])
- % xlabel("Time (sec)")
- % ylabel("Amplitude (mV)")
- % if j == nc
- % title(join(['Block 4 Trial ' string(k)],''))
- % else
- % title(join(['Block ' string(g(j)) ' Trial ' string(k)],''))
- % end
- % end
- % end
- % end
- % end
- %% Apply filter on each channel and store results in multidimensional matrix
- %-- Initate matrix to contain 64-sec trials (in order to transfert first
- % sec to the end)
- % (dimensions are inversed to match filtfilt function input)
- D = zeros(fs*(dur_max+1),ne);
- %------ Subject Level Loop
- for i = i_start:n
- %-- Check participant's Blocks order
- g = cond_order(:,i);
- %-- Initiate multidim matrix for subject i
- dataPT_filt = zeros(ne,ns,nt,nc);
- %-- Load subject i data
- if i < 10
- load(join(["XXXX\data\raw",filesep,"IAN0",i,"_",join(num2str(g)',''),".mat"],''));
- else
- load(join(["XXXX\data\raw",filesep,"IAN",i,"_",join(num2str(g)',''),".mat"],''));
- end
- %-- Reorganize individual datasets into one multidimensional matrix
- data_1raw(:,:,:,:,i) = eeg_data; %#ok<SAGROW>
- %----- Block Level Loop
- for j = 1:nc
- %-- Retrieve which Block was done in the j-th position
- if j == nc
- cond = nc;
- else
- cond = g(j);
- end
- %----- Trial level loop
- for k = 1:nt
- %-- Buffer corresponding dataset
- D(1:length(t),:) = eeg_data(:,:,k,j)';
- %-- Copy the last second at the end
- D((end-fs+1):end,:) = D((end-fs*2+1):end-fs,:);
- %-- Apply filter
- Dfilt = filtfilt(bn,an,filtfilt(b,a,D));
- %-- Delete transients
- Dfilt = Dfilt((fs*3+1):(end-fs),:)';
- %-- Save the data in the corresponding dimension of matrix
- data_2filt(:,:,k,cond,i) = Dfilt; % note that Blocks dim is always in the following order : 1) 1 Hz; 2) 5 Hz; 3) 10 Hz; and 4) Without Neurofeedback
- end
- end
- end
- %-- Save multidim raw matrix
- save("XXXX\data\EEG processed\data_1raw.mat","data_1raw")
- % %-- Save filtered data
- save("XXXX\data\EEG processed\data_2filt.mat","data_2filt")
- % %-- Save new time vector
- save("XXXX\data\EEG processed\data_2filt_tfilt.mat","tfilt")
- %% Visualize the filter effect
- %----- Electrod level loop
- for e = 1:ne
- %----- Subject level loop
- for i = i_start:n
- if e == Fz
- f1 = figure('NumberTitle','off','Name',join(['S' string(i) ' data at Fz'],''));
- f1.WindowState = "maximized";
- elseif e == Fp1
- f1 = figure('NumberTitle','off','Name',join(['S' string(i) ' data at Fp1'],''));
- f1.WindowState = "maximized";
- elseif e == Fpz
- f1 = figure('NumberTitle','off','Name',join(['S' string(i) ' data at Fpz'],''));
- f1.WindowState = "maximized";
- elseif e == Fp2
- f1 = figure('NumberTitle','off','Name',join(['S' string(i) ' data at Fp2'],''));
- f1.WindowState = "maximized";
- elseif e == Cz
- f1 = figure('NumberTitle','off','Name',join(['S' string(i) ' data at Cz'],''));
- f1.WindowState = "maximized";
- else
- f1 = figure('NumberTitle','off','Name',join(['S' string(i) ' data at Pz'],''));
- f1.WindowState = "maximized";
- end
- %----- Block level loop
- for j = 1:nc
- %----- Trial level loop
- for k = 1:nt
- subplot(nc,nt,j*nt-nt+k)
- plot(tfilt,data_2filt(e,:,k,j,i))
- xlim([min(tfilt) max(tfilt)])
- xlabel("Time (sec)")
- ylabel("Amplitude (mV)")
- title(join(['Block ' string(j) ' Trial ' string(k)],''))
- end
- end
- end
- end
IAN_1data_filter.m, no license · at the source
Overview
- Aix Marseille Univ, CNRS, CRPN, Marseille, France
- Institute Neuro-Marseille, Aix Marseille Univ, Marseille, France
- Institute of Language, Communication and the Brain, Aix Marseille Univ, Marseille, France
- Aix Marseille Univ, PSYCLE, Aix-en-Provence, France
Abstract
Electroencephalographic neurofeedback is often assumed to provide volitional control over neural oscillations, with the alpha rhythm regarded as a particularly accessible target. Yet, evidence supporting single-session alpha modulation remains controversial, largely because of insufficient controls for non-specific influences such as time-on-task effects. This study examined whether individuals can downregulate alpha parietal-scalp power during a single neurofeedback session while controlling for feedback veracity and targeted modulation direction. Healthy individuals completed three training blocks in which the size of a visual stimulus reflected either their real-time alpha power (Alpha-Down group), alpha power in the opposite direction (Alpha-Up group), or prerecorded trajectories (Sham group), followed by a transfer block without feedback. The frequency of feedback update was varied across training blocks (1, 5, or 10 Hz). Results showed robust within-session increases in alpha power across all groups, independent of targeted direction, feedback veracity, or update frequency. Theta and sensorimotor rhythm bands also demonstrated an independent increase, while beta remained stable. These findings indicate that apparent alpha modulation in single-session protocols reflects spontaneous, non-specific increases in oscillatory activity rather than genuine volitional control. The results generalise previous evidence on alpha upregulation to its attempted downregulation, reinforcing that time-dependent dynamics such as arousal, fatigue, or mind wandering may dominate single-session outcomes. This work highlights the need for stringent methodological controls when evaluating the specificity of neurofeedback interventions.
Reproduced under the paper's license (CC BY), from the paper cited above.
Repository
Its files are read in the Code ↔ Paper reader above, with 11 matches between paragraphs and lines of code.
OSF 6bn4v
Availability: 1 check, the latest on 28 September 2026: the link answers (HTTP 200)
- 28 September 2026: the link answers (HTTP 200)
21 files
- EEG offline analyses/
pret3/ , MATLAB, 265 lines, 2 matchesIAN_1data_filter.m - EEG offline analyses/
pret3/ , MATLAB, 84 linesIAN_2filt2EEGLAB.m - EEG offline analyses/
pret3/ , MATLAB, 187 lines, 1 matchIAN_3runICA.m - EEG offline analyses/
pret3/ , MATLAB, 141 linesIAN_4ICAtoMAT.m - EEG offline analyses/
t3/ , MATLAB, 163 lines, 2 matchesIAN_5pwr.m - EEG offline analyses/
t3/ , MATLAB, 65 lines, 2 matchesIAN_6zscore.m - EEG offline analyses/
t3/ , MATLAB, 249 linesIAN_7ZtoR.m - EEG offline analyses/
t3/ , MATLAB, 243 linesIAN_7toR.m - EEG offline analyses/
t3/ , MATLAB, 153 linesIAN_trialonly.m - material/
IAN_circle_and_EEG.m , MATLAB, 521 lines - material/
IAN_execute.m , MATLAB, 123 lines - material/
IAN_gencondorder.m , MATLAB, 42 lines, 1 match - material/
IAN_onesteponline.m , MATLAB, 101 lines - material/
IAN_set_EEG_recording_pa , MATLAB, 112 linesrams.m - material/
scripts4questions/ , MATLAB, 38 lineslikert1to5.m - material/
scripts4questions/ , MATLAB, 57 linesqoutput.m - statistical analyses/
IAN_BFsynth.R , R, 294 lines, 1 match - statistical analyses/
IAN_BFsynth_wf.R , R, 194 lines, 1 match - statistical analyses/
IAN_execute_stats.R , R, 601 lines - statistical analyses/
IAN_mainplots.R , R, 574 lines, 1 match - statistical analyses/
IAN_stats4qreps.R , R, 161 lines
The paper's code and data availability statement is in the Data section.
Tracing map
Proposed by the machine: these links were found in the paper and verified at the source, without human review. The map will receive a Zenodo DOI once one of the paper's authors has validated it with their ORCID.
What the map holds:
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- 21 scripts, each with its path and the digest of its content;
- 11 matches between paragraphs of the paper and lines of the code (method lexical-v1);
- neither the text of the paper nor the code itself.
Its JSON (tracing-map.json) is deposited on Zenodo with its DOI once the map is validated.
Data
No dataset and no data link were found in the paper.
Data and Code Availability
Supplementary Table S10 (https://
Reproduced under the paper's license (CC BY), from the paper cited above.
Versions
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Version 2, 28 September 2026
- Funding: added Agence Nationale de la Recherche: ANR-23-CE28-0008, ANR-16-CONV-0002; Ministère de l'Enseignement Supérieur et de la Recherche
Version 1, 28 September 2026: the first record
Recorded: type, language, journal, volume, pages, dates, 5 authors, 4 keywords, 93 references.
Cite
This paper
Maaz, J., Dia, A., Waroquier, L., Paban, V., & Rey, A. (2026). Non-specific increase in alpha power during a neurofeedback session targeting its downregulation. Imaging neuroscience (Cambridge, Mass.), 4, IMAG.a.1258. https://
BibTeX
@article{maaz2026non,
author = {Maaz, Jacob and Dia, Alexandra and Waroquier, Laurent and Paban, Véronique and Rey, Arnaud},
title = {{Non-specific increase in alpha power during a neurofeedback session targeting its downregulation}},
journal = {Imaging neuroscience (Cambridge, Mass.)},
year = {2026},
month = may,
volume = {4},
pages = {IMAG.a.1258},
publisher = {MIT Press},
issn = {2837-6056},
doi = {10.1162/
url = {https://
pmid = {42232075},
pmcid = {PMC13224316}
}
RIS
TY - JOUR
AU - Maaz, Jacob
AU - Dia, Alexandra
AU - Waroquier, Laurent
AU - Paban, Véronique
AU - Rey, Arnaud
TI - Non-specific increase in alpha power during a neurofeedback session targeting its downregulation
T2 - Imaging neuroscience (Cambridge, Mass.)
J2 - Imaging Neurosci (Camb)
PY - 2026
DA - 2026/
VL - 4
SP - IMAG.a.1258
SN - 2837-6056
PB - MIT Press
DO - 10.1162/
UR - https://
LA - en
ER -
CSL-JSON
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"family": "Maaz",
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"given": "Véronique"
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"given": "Arnaud"
}
],
"container-title-short":
"volume": "4",
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