Dataset for: Precise limb-speed afference reveals rhythmogenic drive modality and declines with age

<b>Experimental Paradigm:</b> Participants walked on a split-belt treadmill designed to impose randomized interlimb speed differences (0%, 2%, 5%, 12.5%, 20%, and 30% relative to participant-specific preferred walking speeds). Participants were asked to determine which limb moved faster based solely on proprioceptive feedback, with vision occluded using visual-field-limiting glasses. Each trial consisted of a 3-second proprioceptive evaluation phase initiated by an audio cue (“Focus”), followed by a verbal response indicating the faster limb (“Report”). Each speed condition was repeated seven times, with rest breaks provided as requested due to task duration (~20 min). Young adult participants additionally completed two loading conditions: 10% body-weight support (BWS10) and 10% body-weight loading via backpack weights (BWL10).<br><br><b>Dataset: </b>The dataset includes 6 csv files that contain the data collected from various groups completing the experimental paradigm described above:<br><i>raw_data_young_adults_N.csv</i> --- data for the young adult (age 18-34) group with no body weight support or loading<i>raw_data_young_adults_BWS10.csv</i> --- data for the young adult (age 18-34) group under 10% body weight support<i>raw_data_young_adults_BWL10.csv</i> --- data for the young adult (age 18-34) group under 10% body weight loading<i>raw_data_kids.csv</i> --- data for the kid (age 6-12) group<i>raw_data_middle_aged_adults.csv</i> --- data for the middle-aged adult (age 35-59) group<i>raw_data_older_adults.csv</i> --- data for the older adult (age 60+) groupEach dataset contains the following columns:sGroup --- group namesTrialType --- trial type name (for the young adult groups, this will identify the loading condition)idSession --- session identifiernSpeedLeft --- speed of the left treadmill belt in m/snSpeedRight --- speed of the right treadmill belt in m/ssResponse --- participant’s response to which belt is going faster (L for left, R for right)nSpeedPref --- participant’s self-selected preferred walking speed in m/snAge --- participant’s age in years<b>Analyses: </b>Using this dataset, 3 analyses were conducted: (i) determining the detection threshold of limb speed perception in young adults, (ii) comparing limb speed perception in young adults across loading conditions, and (iii) comparing limb speed perception across age groups. The following MATLAB scripts run each analysis:<i>main_detection_threshold_analysis_v1.m</i><i>main_loading_analysis_v2.m</i><i>main_age_analysis_v2.m</i>Across these scripts, various functions are used. Open each file for a description of its use, inputs, outputs, and dependences.<i>getDetectionThreshold_v1.m</i><i>getLogistic_v3.m</i><i>plot_perception_data_v13.m</i><i>plotMeanSDBox_v1.m</i>