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Dynamic population coding of kinematic structure across executed and observed actions in primate premotor cortex.

Code ↔ Paper

3 matches between paragraphs of the paper and lines of its authors' code, computed by the harvester (lexical-v1). Click a colored paragraph or line to see its counterpart.

The 3 matches · 2 of them tie a paragraph to a whole file, not to given lines: weak matches, whose lines are not tinted
  1. [1] § RESULTS › Neural population encoding of grasp configurations ↔ Fig_3.m, lines 1–122 · score 0.60 · consecutive bins, neurons selective, selectivity stability, events, Figure 3, Population
  2. [2] § MATERIALS AND METHODS › Canonical correlation analysis ↔ Fig_4.m, the whole file · a weak match · score 0.57 · canonical correlations, canonical dimension, shuffling, trajectories
  3. [3] § RESULTS › Encoding of action kinematics ↔ Fig_9.m, the whole file · a weak match · score 0.56 · cross predicted kinematics, Human kinematics predicted, Monkey kinematics predicted, model, Figure 9, contours

Paper

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The authors' code

MATLAB · 261 lines · 11 KB · CC-BY-4.0 · 1 match

  1. clear
  2. % Load data
  3. data_dir = 'data\neuronal_selectivity.mat';
  4. load(data_dir)
  5. names_to_plot = who('-file', data_dir);
  6. load('data\event_times.mat');
  7. graymap = [linspace(0,0.9,100)', linspace(0,0.9,100)', linspace(0,0.9,100)'; % colormap gray
  8. 1, 1, 1];
  9. cmap = [linspace(0, 0.3, 26)', linspace(0.2, 0.5, 26)', linspace(0, 0, 26)'; % colormap green-yellow-red
  10. linspace(0.3, 0.95, 12)' linspace(0.5, 0.9, 12)' linspace(0, 0.1, 12)';
  11. linspace(0.95, 1, 30)' linspace(0.9, 0.5, 30)' linspace(0.1, 0, 30)';
  12. linspace(1, 0.9, 35)' linspace(0.5, 0, 35)' linspace(0, 0, 35)'];
  13. time_points = -550:25:3350;
  14. time_0 = find(time_points==0);
  15. % Run for different conditions and populations
  16. for i = 1:length(names_to_plot)
  17. % Sort normalized activity
  18. eval(['curr_result =' names_to_plot{i} ';']);
  19. isSelective = curr_result.selectivity_p < 0.05;
  20. [isSelective,order] = keep_only_consecutive_bins(isSelective);
  21. curr_mat_to_plot = curr_result.selectivity_p .* isSelective;
  22. curr_mat_to_plot(curr_mat_to_plot==0) = 1;
  23. percent_selective_units = sum(isSelective, 1)./size(isSelective,1);
  24. % Plots
  25. f = figure();
  26. pos = get(f, 'Position');
  27. set(f, 'Position', [0, pos(2), 3*pos(3), pos(4)]);
  28. sgtitle(names_to_plot{i}, 'Interpreter', 'none')
  29. subplot(1, 3, 1); % per neuron selectivity
  30. hh=imagesc(curr_mat_to_plot(order,:));
  31. set(hh, 'AlphaData', ~isnan(curr_mat_to_plot))
  32. caxis([0 0.05])
  33. c = colorbar();
  34. colormap(graymap)
  35. xlabel('Time (s)')
  36. ylabel('# Neurons')
  37. xticks = time_0:20:length(time_points);
  38. set(gca, 'XTick', xticks);
  39. set(gca, 'XTickLabel', time_points(xticks)/1000);
  40. set(gca, 'tickdir', 'out')
  41. c.Label.String = 'selectivity p-value';
  42. line([find(time_points==0), find(time_points==0)],get(gca, 'YLim'),'color', [.5 .5 .5],'LineWidth',1, 'LineStyle', '--')
  43. line([find(time_points==1250), find(time_points==1250)],get(gca, 'YLim'),'color', [.5 .5 .5],'LineWidth',1, 'LineStyle', '--')
  44. line([find(time_points==800), find(time_points==800)],get(gca, 'YLim'),'color', [.9 .9 .9],'LineWidth',3)
  45. [~,endMoveIndex] = min(abs(time_points-endMove(i)));
  46. line([endMoveIndex, endMoveIndex], get(gca, 'YLim'),'color',[.5 .5 .5], 'LineStyle', '--' )
  47. [~,endHoldIndex] = min(abs(time_points-endHold(i)));
  48. line([endHoldIndex, endHoldIndex], get(gca, 'YLim'),'color',[.5 .5 .5], 'LineStyle', '--' )
  49. subplot(1, 3, 2); % selective units per time bin
  50. plot(time_points/1000, imgaussfilt(percent_selective_units,2), 'color', 'k','LineWidth',2)
  51. xlim([-0.600 3.400])
  52. ylim(get(gca, 'YLim'))
  53. line([0, 0],get(gca, 'YLim'),'color', [.5 .5 .5],'LineWidth',1, 'LineStyle', '--')
  54. line([1.250, 1.250],get(gca, 'YLim'),'color', [.5 .5 .5],'LineWidth',1, 'LineStyle', '--')
  55. line([0.800, 0.800],get(gca, 'YLim'),'color', [.9 .9 .9],'LineWidth',3)
  56. line([endMove(i)/1000, endMove(i)/1000], get(gca, 'YLim'),'color',[.5 .5 .5], 'LineStyle', '--' )
  57. line([endHold(i)/1000, endHold(i)/1000], get(gca, 'YLim'),'color',[.5 .5 .5], 'LineStyle', '--' )
  58. xlabel('Time (s)')
  59. ylabel('selective neurons (%)')
  60. ax3 = subplot(1, 3, 3); % selectivity stability map
  61. imagesc(curr_result.stability_map ./ (diag(curr_result.stability_map)+12))
  62. hold on;
  63. line([find(time_points==0), find(time_points==0)], get(gca, 'YLim'), 'color', [1 1 1],'LineWidth',1, 'LineStyle', '--')
  64. line(get(gca, 'XLim'), [find(time_points==0), find(time_points==0)], 'color', [1 1 1],'LineWidth',1, 'LineStyle', '--')
  65. line([find(time_points==1250), find(time_points==1250)], get(gca, 'YLim'), 'color', [1 1 1],'LineWidth',1, 'LineStyle', '--')
  66. line(get(gca, 'XLim'), [find(time_points==1250), find(time_points==1250)], 'color', [1 1 1],'LineWidth',1, 'LineStyle', '--')
  67. line([find(time_points==800), find(time_points==800)], get(gca, 'YLim'), 'color', [1 1 1],'LineWidth',3)
  68. line(get(gca, 'XLim'), [find(time_points==800), find(time_points==800)], 'color', [1 1 1],'LineWidth',3)
  69. [~,endMoveIndex] = min(abs(time_points-endMove(i)));
  70. line([endMoveIndex, endMoveIndex], get(gca, 'YLim'), 'color',[1 1 1], 'LineStyle', '--' )
  71. line(get(gca, 'XLim'), [endMoveIndex, endMoveIndex], 'color',[1 1 1], 'LineStyle', '--' )
  72. [~,endHoldIndex] = min(abs(time_points-endHold(i)));
  73. line([endHoldIndex, endHoldIndex], get(gca, 'YLim'), 'color',[1 1 1], 'LineStyle', '--' )
  74. line(get(gca, 'XLim'), [endHoldIndex, endHoldIndex], 'color',[1 1 1], 'LineStyle', '--' )
  75. set(gca,'YDir','normal')
  76. axis image
  77. ylabel('reference time (s)')
  78. xlabel('test time (s)')
  79. ticks = time_0:20:length(time_points);
  80. set(gca, 'XTick', ticks);
  81. set(gca, 'XTickLabel', time_points(ticks)/1000);
  82. set(gca, 'YTick', ticks);
  83. set(gca, 'YTickLabel', time_points(ticks)/1000);
  84. set(gca, 'tickdir', 'out')
  85. box on
  86. colormap(ax3, cmap)
  87. caxis([0 0.8])
  88. cc = colorbar(ax3);
  89. cc.Label.String = 'selectivity stability index (population average)';
  90. end
  91. %% plot congruency map
  92. data_dir = 'data\selectivity_congruence.mat';
  93. load(data_dir)
  94. f = figure();
  95. pos = get(f, 'Position');
  96. set(f, 'Position', [0, pos(2), 2*pos(3), pos(4)]);
  97. subplot(1, 2, 1); % sum of common selectivity periods
  98. imagesc(common_selectivity)
  99. hold on;
  100. line([find(time_points==0), find(time_points==0)], get(gca, 'YLim'), 'color', [1 1 1],'LineWidth',1, 'LineStyle', '--')
  101. line(get(gca, 'XLim'), [find(time_points==0), find(time_points==0)], 'color', [1 1 1],'LineWidth',1, 'LineStyle', '--')
  102. line([find(time_points==1250), find(time_points==1250)], get(gca, 'YLim'), 'color', [1 1 1],'LineWidth',1, 'LineStyle', '--')
  103. line(get(gca, 'XLim'), [find(time_points==1250), find(time_points==1250)], 'color', [1 1 1],'LineWidth',1, 'LineStyle', '--')
  104. line([find(time_points==800), find(time_points==800)], get(gca, 'YLim'), 'color', [1 1 1],'LineWidth',3)
  105. line(get(gca, 'XLim'), [find(time_points==800), find(time_points==800)], 'color', [1 1 1],'LineWidth',3)
  106. [~,endMoveIndex] = min(abs(time_points-endMove(1)));
  107. line([endMoveIndex, endMoveIndex], get(gca, 'YLim'), 'color',[1 1 1], 'LineStyle', '--' )
  108. [~,endMoveIndex] = min(abs(time_points-endMove(2)));
  109. line(get(gca, 'XLim'), [endMoveIndex, endMoveIndex], 'color',[1 1 1], 'LineStyle', '--' )
  110. [~,endHoldIndex] = min(abs(time_points-endHold(1)));
  111. line([endHoldIndex, endHoldIndex], get(gca, 'YLim'), 'color',[1 1 1], 'LineStyle', '--' )
  112. [~,endHoldIndex] = min(abs(time_points-endHold(2)));
  113. line(get(gca, 'XLim'), [endHoldIndex, endHoldIndex], 'color',[1 1 1], 'LineStyle', '--' )
  114. ylabel('time (s) - GO')
  115. xlabel('time (s) - GE')
  116. title('common selectivity')
  117. set(gca,'YDir','normal')
  118. axis image
  119. ticks = time_0:20:length(time_points);
  120. set(gca, 'XTick', ticks);
  121. set(gca, 'XTickLabel', time_points(ticks)/1000);
  122. set(gca, 'YTick', ticks);
  123. set(gca, 'YTickLabel', time_points(ticks)/1000);
  124. set(gca, 'tickdir', 'out')
  125. box on
  126. subplot(1, 2, 2); % sum of congruent selectivity periods
  127. imagesc(congruence)
  128. hold on;
  129. line([find(time_points==0), find(time_points==0)], get(gca, 'YLim'), 'color', [1 1 1],'LineWidth',1, 'LineStyle', '--')
  130. line(get(gca, 'XLim'), [find(time_points==0), find(time_points==0)], 'color', [1 1 1],'LineWidth',1, 'LineStyle', '--')
  131. line([find(time_points==1250), find(time_points==1250)], get(gca, 'YLim'), 'color', [1 1 1],'LineWidth',1, 'LineStyle', '--')
  132. line(get(gca, 'XLim'), [find(time_points==1250), find(time_points==1250)], 'color', [1 1 1],'LineWidth',1, 'LineStyle', '--')
  133. line([find(time_points==800), find(time_points==800)], get(gca, 'YLim'), 'color', [1 1 1],'LineWidth',3)
  134. line(get(gca, 'XLim'), [find(time_points==800), find(time_points==800)], 'color', [1 1 1],'LineWidth',3)
  135. [~,endMoveIndex] = min(abs(time_points-endMove(1)));
  136. line([endMoveIndex, endMoveIndex], get(gca, 'YLim'), 'color',[1 1 1], 'LineStyle', '--' )
  137. [~,endMoveIndex] = min(abs(time_points-endMove(2)));
  138. line(get(gca, 'XLim'), [endMoveIndex, endMoveIndex], 'color',[1 1 1], 'LineStyle', '--' )
  139. [~,endHoldIndex] = min(abs(time_points-endHold(1)));
  140. line([endHoldIndex, endHoldIndex], get(gca, 'YLim'), 'color',[1 1 1], 'LineStyle', '--' )
  141. [~,endHoldIndex] = min(abs(time_points-endHold(2)));
  142. line(get(gca, 'XLim'), [endHoldIndex, endHoldIndex], 'color',[1 1 1], 'LineStyle', '--' )
  143. ylabel('reference time (s) - GO')
  144. xlabel('test time (s) - GE')
  145. title('congruent selectivity')
  146. set(gca,'YDir','normal')
  147. axis image
  148. ticks = time_0:20:length(time_points);
  149. set(gca, 'XTick', ticks);
  150. set(gca, 'XTickLabel', time_points(ticks)/1000);
  151. set(gca, 'YTick', ticks);
  152. set(gca, 'YTickLabel', time_points(ticks)/1000);
  153. set(gca, 'tickdir', 'out')
  154. box on
  155. c = colorbar();
  156. c.Label.String = 'sum of common/congruent selectivity periods';
  157. colormap(cmap)
  158. caxis([0 35])
  159. %%
  160. function [isSig, order] = keep_only_consecutive_bins(isSig)
  161. first_significance = nan(1,size(isSig,1));
  162. for iUnit= 1:size(isSig,1)
  163. %%%% keep only consecutive bin significant periods
  164. bin = 1;
  165. min_num_of_bins = 7; % choose minimum number of significant bins
  166. while bin <= size(isSig,2)
  167. if isSig(iUnit,bin) == 1
  168. cond = 1;
  169. k = 0;
  170. while cond % check the next bins
  171. k = k+1;
  172. if bin+k>size(isSig,2) % dont let the bin go above limit
  173. if k<min_num_of_bins
  174. isSig(iUnit,bin:bin+k-1) = 0;
  175. end
  176. break
  177. end
  178. if isSig(iUnit,bin+k) == 0 % find the end of the significant period
  179. cond = 0;
  180. if k<min_num_of_bins
  181. isSig(iUnit,bin:bin+k) = 0; % delete short significant periods
  182. end
  183. end
  184. end
  185. bin = bin+k+1;
  186. else
  187. bin = bin+1;
  188. end
  189. end % for all bins
  190. %%% find first significance after movement preparation
  191. if max(isSig(iUnit,60:157))==1
  192. first_index = 59+find(isSig(iUnit,60:157),1);
  193. % [max_pev, max_index] = max(omegaSq{iUnit}{iCond}.*significant{iUnit}{iCond});
  194. % first_significance(iUnit,iCond) = max_index;
  195. ind = 0;
  196. while isnan(first_significance(iUnit))
  197. ind = ind+1;
  198. if isSig(iUnit,first_index-ind)==0 && isSig(iUnit,first_index-ind-1)==0 && isSig(iUnit,first_index-ind-2)==0 && isSig(iUnit,first_index-ind-3)==0
  199. first_significance(iUnit) = first_index-ind+1;
  200. elseif first_index-ind-3==1
  201. first_significance(iUnit) = first_index-ind+1;
  202. end
  203. end
  204. end
  205. end
  206. [~,order] = sort(first_significance);
  207. end

Fig_3.m, under CC-BY-4.0 · at the source

Overview

  1. Lab of Movement Physiology, Medical School, University of Crete, Heraklion, Greece
  2. Graduate Program in the Brain and Mind Sciences, University of Crete, Heraklion, Greece
  3. Institute of Applied and Computational Mathematics, Foundation for Research and Technology-Hellas, Heraklion, Greece
Journal: Science advances, volume 12, issue 25, article eaed9309
Dates: received 14 November 2025; accepted 8 May 2026; published online 19 June 2026; in print June 2026
Type: Research article · Language: English
License: CC BY
Identifiers: DOI 10.1126/sciadv.aed9309 · PMID 42319945 · PMCID PMC13281793 · OpenAlex W7165376055
Open access: gold, a free copy (OpenAlex)
Status: code verified
Categories: other (modality), non-human primate (organism), systems (subfield)
Methods: Spectral & time-frequency, Connectivity, Statistics, Smoothing, state filtering, decompositions, Machine learning, Preprocessing, Single-unit activity, calcium imaging
MeSH: Motor Cortex*, Animals, Biomechanical Phenomena, Hand Strength, Macaca mulatta, Male, Movement, Neurons (* major topic)
Topic: Action Observation and Synchronization (Social Psychology, Psychology), according to OpenAlex
Funding: European Regional Development Fund (MIS 5048512)
Citations: not cited yet (Europe PMC); 91 references in the paper

Abstract

Neurons active during both action execution and observation [mirror neurons (MirNs)] are central to theories of action understanding, yet what they represent remains debated: abstract goals, static grips, or movement kinematics? We recorded 433 neurons from macaque premotor cortex during execution and observation of reach-to-grasp actions. Population analyses revealed grasp-specific information in both conditions, broadly distributed across neurons and dynamically reconfigured over time. Generalization across task phases was limited, indicating time-specific and evolving population codes rather than static representations. Execution and observation were linked by a shared, partially overlapping population geometry that supported reliable cross-condition classification, with the strongest alignment emerging during movement and hold. Neural activity was systematically related to multidimensional hand kinematics, and these relationships generalized across neuronal populations and across agents. Together, these findings support a dynamic population-level account of MirN function in which premotor circuits integrate visual and motor signals to represent and anticipate the unfolding structure of others’ actions.

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 3 matches between paragraphs and lines of code.

Zenodo 18983284

License: CC-BY-4.0
State: the link answers, verified on 27 September 2026
Evidence: files inventoried
Languages: MATLAB (9)
Size: 20 files, 9 scripts
Software Heritage: not checked
Found in: “Data, code, and materials availability:”
Not found: README, license file, CITATION.cff, environment file, tests, continuous integration, documentation
Availability: 1 check, the latest on 27 September 2026: the link answers (HTTP 200)
  • 27 September 2026: the link answers (HTTP 200)
9 files

The paper's code and data availability statement is in the Data section.

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  • 9 scripts, each with its path and the digest of its content;
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  • neither the text of the paper nor the code itself.

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Data

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Data, code, and materials availability

All data and code needed to evaluate and reproduce the results in the paper are present in the paper and/or the Supplementary Materials. The data and code used to generate the figures have been deposited to Zenodo (https://doi.org/10.5281/zenodo.18983284). This study did not generate new materials.

Reproduced under the paper's license (CC BY), from the paper cited above.

Versions

The history of this record: each version stored by the harvester or made by a correction of its authors or of the maintainers of its code, and what changed in its facts. The texts of the paper (its abstract, its availability statements) are not part of it; versions that changed only those are not listed.

Version 2, 28 September 2026

  • Funding: added European Social Fund: MIS 5048512

Version 1, 27 September 2026: the first record

Recorded: type, language, journal, volume, issue, pages, dates, 5 authors, 8 MeSH terms, 86 references.

Cite

This paper

Chatzimichail, K., Paschalidis, C., Tzamali, E., Papadourakis, V., & Raos, V. (2026). Dynamic population coding of kinematic structure across executed and observed actions in primate premotor cortex. Science advances, 12(25), eaed9309. https://doi.org/10.1126/sciadv.aed9309

BibTeX

@article{chatzimichail2026dynamic,
author = {Chatzimichail, Konstantinos and Paschalidis, Christos and Tzamali, Eleftheria and Papadourakis, Vassilis and Raos, Vassilis},
title = {{Dynamic population coding of kinematic structure across executed and observed actions in primate premotor cortex}},
journal = {Science advances},
year = {2026},
month = jun,
volume = {12},
number = {25},
pages = {eaed9309},
publisher = {American Association for the Advancement of Science},
issn = {2375-2548},
doi = {10.1126/sciadv.aed9309},
url = {https://doi.org/10.1126/sciadv.aed9309},
pmid = {42319945},
pmcid = {PMC13281793}
}

RIS

TY - JOUR
AU - Chatzimichail, Konstantinos
AU - Paschalidis, Christos
AU - Tzamali, Eleftheria
AU - Papadourakis, Vassilis
AU - Raos, Vassilis
TI - Dynamic population coding of kinematic structure across executed and observed actions in primate premotor cortex
T2 - Science advances
J2 - Sci Adv
PY - 2026
DA - 2026/06/19
VL - 12
IS - 25
SP - eaed9309
SN - 2375-2548
PB - American Association for the Advancement of Science
DO - 10.1126/sciadv.aed9309
UR - https://doi.org/10.1126/sciadv.aed9309
LA - en
ER -

CSL-JSON

{
"id": "10.1126/sciadv.aed9309",
"type": "article-journal",
"title": "Dynamic population coding of kinematic structure across executed and observed actions in primate premotor cortex",
"container-title": "Science advances",
"author": [
{
"family": "Chatzimichail",
"given": "Konstantinos"
},
{
"family": "Paschalidis",
"given": "Christos"
},
{
"family": "Tzamali",
"given": "Eleftheria"
},
{
"family": "Papadourakis",
"given": "Vassilis"
},
{
"family": "Raos",
"given": "Vassilis"
}
],
"container-title-short": "Sci Adv",
"volume": "12",
"issue": "25",
"page": "eaed9309",
"DOI": "10.1126/sciadv.aed9309",
"PMID": "42319945",
"PMCID": "PMC13281793",
"ISSN": "2375-2548",
"publisher": "American Association for the Advancement of Science",
"URL": "https://doi.org/10.1126/sciadv.aed9309",
"language": "en",
"issued": {
"date-parts": [
[
2026,
6,
19
]
]
}
}

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