Effects of Intra-Subject Variation in Gait Analysis on ASD Classification Performance in Machine Learning Models

Benn Henderson, Y Pratheepan, Bryan Gardiner, T.Martin McGinnity, Kitty Forster, Bradley Nicholas, Dawn Wimpory, Jithangi Wanigasinghe

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Abstract

Autism Spectrum Disorder (ASD) is a developmental disorder that is prevalent globally. Research into detecting autism traditionally focused on behavioural aspects of the condition, however, more recently, focus has shifted to more
objective alternatives using techniques such as machine learning and gait analysis. Gait measurements, having been used for person identification, varies from person to person, introducing a lot of intra-subject variance. This applies to the 8 spatialtemporal features used in this study, representing the time that an individual spends in each phase of a gait cycle, collected using a Vicon motion tracking system. The features were averaged across each gait trial that the subjects performed, producing a second set of features with reduced intra-subject variance. Four common classifiers, a Support Vector Machine (SVM), KNearest Neighbour (KNN), Random Forests (RF) and a Decision Tree (DT) classifier, were all trained using the two feature sets and their classification rates were compared. The results show that for the RF classifier, reducing the intra-subject variance, was able to successfully increase the classification power. The
KNN and DT classifiers experienced a minimal decrease in accuracy, where the SVM suffered the greatest loss when intrasubject variance was reduced. Results overall show that the effect intra-subject variance has on classification power depends heavily on the suitability of the classifier to the initial problem as well as size and class balance of the data.
Original languageEnglish
Publication statusPublished - 2 Jun 2020
EventISSC 2020 - 31st Irish Signals and Systems Conference: ISSC 2020 - Letterkenny Institute of Technology (virtual/online), Letterkenny, Ireland
Duration: 11 Jun 202012 Jun 2020
https://www.issc.ie/

Conference

ConferenceISSC 2020 - 31st Irish Signals and Systems Conference
CountryIreland
CityLetterkenny
Period11/06/2012/06/20
Internet address

Keywords

  • Machine Learning
  • Autism Spectrum Disorder (ASD)
  • Classification algorithms

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    Henderson, B., Pratheepan, Y., Gardiner, B., McGinnity, T. M., Forster, K., Nicholas, B., Wimpory, D., & Wanigasinghe, J. (2020). Effects of Intra-Subject Variation in Gait Analysis on ASD Classification Performance in Machine Learning Models. Paper presented at ISSC 2020 - 31st Irish Signals and Systems Conference, Letterkenny, Ireland.