Dataset and Statistics

Dataset DescriptionFile: data_BM_motorskills.csvFormat: CSV The file contains 1,590 observations from 53 participants with 18 variables:Participant_id: Unique ID for each participant (53 levels).Trial_onset: Timestamp of trial start (ms).Response_time: Timestamp of participant's response (ms).Reaction_time: Response latency (ms).Accuracy: Binary (1 = correct, 0 = incorrect).Stimulus: Point-light display (PLD) video filename.Experimental_task: Task type ("Action" or "Interaction").Correct_response: Expected response key ("Down", "Left", "Right").Response_key: Actual key pressed by participant.Group: Autistic trait group ("High", "Medium", "Low" based on AQ).AQ_binary: Raw Autism Quotient score.Age: Participant's age (years).Gender: Binary ("f", "m").IQ_RPM: Raven's Matrices score (processed scores).Handedness: Binary ("Left" or "Right").NHPT_Right_Hand, NHPT_Left_Hand: Nine-Hole Peg Test time (seconds) for each hand.Noncompliance: Binary flag for noncompliant trials (0 = valid).#####Analysis Code OverviewThe script analysis.R performs data cleaning, demographic checks, and mixed-effects modeling for accuracy and reaction time (RT) analysis. Below are the key steps:RSudio version: 2023.03.0 Build 386Libraries: Uses dplyr, tidyr, lme4, lmerTest, emmeans, performance, interactions.1. Data PreparationRemoves non-compliant trials (Noncompliance != 1).Excludes left-handed participants and intermediate AQ group (Group != "Medium").Drops NA values and unused factor levels.2. Demographic ChecksCompares groups (High vs. Low AQ) on:Gender distribution (χ² test).IQ and age (Wilcoxon tests).3. Accuracy AnalysisModel 1: Tests effects of Group and Experimental_task on accuracy (binomial GLMM).Model 2: Adds interaction with motor skills (NHPT_Right_Hand).Follow-up: simple effect analysis via emmeans.4. Reaction Time (RT) AnalysisPreprocessing:Excludes RTs for incorrect trials.Removes outliers (1.5×IQR rule) and z-scales RTs within tasks.Models:Model 1: Effects of Group and Task (LMM).Follow-up: simple effect analysis via emmeans.Model 2: Adds interaction with NHPT_Right_Hand.Follow-up: Simple slopes analysis, trends analysis.5. Model ComparisonCompares Model 1 and Model 2 for reaction time using AIC, BIC, and R².