Analysis of in-air movement in handwriting: A novel marker for Parkinson's disease

•We exploit the fact that movement during handwriting of a text consists of on-surface and in-air movements and use it for differential diagnosis of PD.•By applying feature selection algorithms and support vector machine learning methods to separate PD from HC, we demonstrated 85% classification acc...

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Published inComputer methods and programs in biomedicine Vol. 117; no. 3; pp. 405 - 411
Main Authors Drotár, Peter, Mekyska, Jiří, Rektorová, Irena, Masarová, Lucia, Smékal, Zdenek, Faundez-Zanuy, Marcos
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier Ireland Ltd 01.12.2014
Elsevier
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Abstract •We exploit the fact that movement during handwriting of a text consists of on-surface and in-air movements and use it for differential diagnosis of PD.•By applying feature selection algorithms and support vector machine learning methods to separate PD from HC, we demonstrated 85% classification accuracy.•Decision support system based on handwriting analysis can be complementary method to diagnosis made by clinician or other decision support systems. Parkinson's disease (PD) is the second most common neurodegenerative disease affecting significant portion of elderly population. One of the most frequent hallmarks and usually also the first manifestation of PD is deterioration of handwriting characterized by micrographia and changes in kinematics of handwriting. There is no objective quantitative method of clinical diagnosis of PD. It is thought that PD can only be definitively diagnosed at postmortem, which further highlights the complexities of diagnosis. We exploit the fact that movement during handwriting of a text consists not only from the on-surface movements of the hand, but also from the in-air trajectories performed when the hand moves in the air from one stroke to the next. We used a digitizing tablet to assess both in-air and on-surface kinematic variables during handwriting of a sentence in 37 PD patients on medication and 38 age- and gender-matched healthy controls. By applying feature selection algorithms and support vector machine learning methods to separate PD patients from healthy controls, we demonstrated that assessing the in-air/on-surface hand movements led to accurate classifications in 84% and 78% of subjects, respectively. Combining both modalities improved the accuracy by another 1% over the evaluation of in-air features alone and provided medically relevant diagnosis with 85.61% prediction accuracy. Assessment of in-air movements during handwriting has a major impact on disease classification accuracy. This study confirms that handwriting can be used as a marker for PD and can be with advance used in decision support systems for differential diagnosis of PD.
AbstractList Background and objective: Parkinson's disease (PD) is the second most common neurodegenerative disease affecting significant portion of elderly population. One of the most frequent hallmarks and usually also the first manifestation of PD is deterioration of handwriting characterized by micrographia and changes in kinematics of handwriting. There is no objective quantitative method of clinical diagnosis of PD. It is thought that PD can only be definitively diagnosed at postmortem, which further highlights the complexities of diagnosis. Methods: We exploit the fact that movement during handwriting of a text consists not only from the on-surface movements of the hand, but also from the in-air trajectories performed when the hand moves in the air from one stroke to the next. We used a digitizing tablet to assess both in-air and on-surface kinematic variables during handwriting of a sentence in 37 PD patients on medication and 38 age- and gender-matched healthy controls. Results: By applying feature selection algorithms and support vector machine learning methods to separate PD patients from healthy controls, we demonstrated that assessing the in-air/on-surface hand movements led to accurate classifications in 84% and 78% of subjects, respectively. Combining both modalities improved the accuracy by another 1% over the evaluation of in-air features alone and provided medically relevant diagnosis with 85.61% prediction accuracy. Conclusions: Assessment of in-air movements during handwriting has a major impact on disease classification accuracy. This study confirms that handwriting can be used as a marker for PD and can be with advance used in decision support systems for differential diagnosis of PD.
Parkinson's disease (PD) is the second most common neurodegenerative disease affecting significant portion of elderly population. One of the most frequent hallmarks and usually also the first manifestation of PD is deterioration of handwriting characterized by micrographia and changes in kinematics of handwriting. There is no objective quantitative method of clinical diagnosis of PD. It is thought that PD can only be definitively diagnosed at postmortem, which further highlights the complexities of diagnosis.BACKGROUND AND OBJECTIVEParkinson's disease (PD) is the second most common neurodegenerative disease affecting significant portion of elderly population. One of the most frequent hallmarks and usually also the first manifestation of PD is deterioration of handwriting characterized by micrographia and changes in kinematics of handwriting. There is no objective quantitative method of clinical diagnosis of PD. It is thought that PD can only be definitively diagnosed at postmortem, which further highlights the complexities of diagnosis.We exploit the fact that movement during handwriting of a text consists not only from the on-surface movements of the hand, but also from the in-air trajectories performed when the hand moves in the air from one stroke to the next. We used a digitizing tablet to assess both in-air and on-surface kinematic variables during handwriting of a sentence in 37 PD patients on medication and 38 age- and gender-matched healthy controls.METHODSWe exploit the fact that movement during handwriting of a text consists not only from the on-surface movements of the hand, but also from the in-air trajectories performed when the hand moves in the air from one stroke to the next. We used a digitizing tablet to assess both in-air and on-surface kinematic variables during handwriting of a sentence in 37 PD patients on medication and 38 age- and gender-matched healthy controls.By applying feature selection algorithms and support vector machine learning methods to separate PD patients from healthy controls, we demonstrated that assessing the in-air/on-surface hand movements led to accurate classifications in 84% and 78% of subjects, respectively. Combining both modalities improved the accuracy by another 1% over the evaluation of in-air features alone and provided medically relevant diagnosis with 85.61% prediction accuracy.RESULTSBy applying feature selection algorithms and support vector machine learning methods to separate PD patients from healthy controls, we demonstrated that assessing the in-air/on-surface hand movements led to accurate classifications in 84% and 78% of subjects, respectively. Combining both modalities improved the accuracy by another 1% over the evaluation of in-air features alone and provided medically relevant diagnosis with 85.61% prediction accuracy.Assessment of in-air movements during handwriting has a major impact on disease classification accuracy. This study confirms that handwriting can be used as a marker for PD and can be with advance used in decision support systems for differential diagnosis of PD.CONCLUSIONSAssessment of in-air movements during handwriting has a major impact on disease classification accuracy. This study confirms that handwriting can be used as a marker for PD and can be with advance used in decision support systems for differential diagnosis of PD.
•We exploit the fact that movement during handwriting of a text consists of on-surface and in-air movements and use it for differential diagnosis of PD.•By applying feature selection algorithms and support vector machine learning methods to separate PD from HC, we demonstrated 85% classification accuracy.•Decision support system based on handwriting analysis can be complementary method to diagnosis made by clinician or other decision support systems. Parkinson's disease (PD) is the second most common neurodegenerative disease affecting significant portion of elderly population. One of the most frequent hallmarks and usually also the first manifestation of PD is deterioration of handwriting characterized by micrographia and changes in kinematics of handwriting. There is no objective quantitative method of clinical diagnosis of PD. It is thought that PD can only be definitively diagnosed at postmortem, which further highlights the complexities of diagnosis. We exploit the fact that movement during handwriting of a text consists not only from the on-surface movements of the hand, but also from the in-air trajectories performed when the hand moves in the air from one stroke to the next. We used a digitizing tablet to assess both in-air and on-surface kinematic variables during handwriting of a sentence in 37 PD patients on medication and 38 age- and gender-matched healthy controls. By applying feature selection algorithms and support vector machine learning methods to separate PD patients from healthy controls, we demonstrated that assessing the in-air/on-surface hand movements led to accurate classifications in 84% and 78% of subjects, respectively. Combining both modalities improved the accuracy by another 1% over the evaluation of in-air features alone and provided medically relevant diagnosis with 85.61% prediction accuracy. Assessment of in-air movements during handwriting has a major impact on disease classification accuracy. This study confirms that handwriting can be used as a marker for PD and can be with advance used in decision support systems for differential diagnosis of PD.
Parkinson's disease (PD) is the second most common neurodegenerative disease affecting significant portion of elderly population. One of the most frequent hallmarks and usually also the first manifestation of PD is deterioration of handwriting characterized by micrographia and changes in kinematics of handwriting. There is no objective quantitative method of clinical diagnosis of PD. It is thought that PD can only be definitively diagnosed at postmortem, which further highlights the complexities of diagnosis. We exploit the fact that movement during handwriting of a text consists not only from the on-surface movements of the hand, but also from the in-air trajectories performed when the hand moves in the air from one stroke to the next. We used a digitizing tablet to assess both in-air and on-surface kinematic variables during handwriting of a sentence in 37 PD patients on medication and 38 age- and gender-matched healthy controls. By applying feature selection algorithms and support vector machine learning methods to separate PD patients from healthy controls, we demonstrated that assessing the in-air/on-surface hand movements led to accurate classifications in 84% and 78% of subjects, respectively. Combining both modalities improved the accuracy by another 1% over the evaluation of in-air features alone and provided medically relevant diagnosis with 85.61% prediction accuracy. Assessment of in-air movements during handwriting has a major impact on disease classification accuracy. This study confirms that handwriting can be used as a marker for PD and can be with advance used in decision support systems for differential diagnosis of PD.
Highlights • We exploit the fact that movement during handwriting of a text consists of on-surface and in-air movements and use it for differential diagnosis of PD. • By applying feature selection algorithms and support vector machine learning methods to separate PD from HC, we demonstrated 85% classification accuracy. • Decision support system based on handwriting analysis can be complementary method to diagnosis made by clinician or other decision support systems.
Author Faundez-Zanuy, Marcos
Mekyska, Jiří
Drotár, Peter
Rektorová, Irena
Masarová, Lucia
Smékal, Zdenek
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  fullname: Rektorová, Irena
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  givenname: Lucia
  surname: Masarová
  fullname: Masarová, Lucia
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  surname: Faundez-Zanuy
  fullname: Faundez-Zanuy, Marcos
  organization: Tecnocampus, Av. Ernest Lluch, 32, 08302 Mataro, Barcelona, Spain
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Issue 3
Keywords Decision support systems
Handwriting
In-air movement
Parkinson's disease
Disease classification
Micrographia
Human
Computer vision
Cognitive disorder
Motion estimation
Decision support system
Parkinson disease
Text
Marker
Hand
Kinematics
Body movement
Vector support machine
Diagnosis
Manuscript character
Elderly
Sentence
Age
Micrography
Language English
License CC BY 4.0
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SSID ssj0002556
Score 2.4147866
Snippet •We exploit the fact that movement during handwriting of a text consists of on-surface and in-air movements and use it for differential diagnosis of PD.•By...
Highlights • We exploit the fact that movement during handwriting of a text consists of on-surface and in-air movements and use it for differential diagnosis...
Parkinson's disease (PD) is the second most common neurodegenerative disease affecting significant portion of elderly population. One of the most frequent...
Background and objective: Parkinson's disease (PD) is the second most common neurodegenerative disease affecting significant portion of elderly population. One...
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StartPage 405
SubjectTerms Accuracy
Aged
Algorithms
Applied sciences
Artificial Intelligence
Biological and medical sciences
Biomechanical Phenomena
Case-Control Studies
Classifications
Computer science; control theory; systems
Computerized, statistical medical data processing and models in biomedicine
Control equipment
Data processing. List processing. Character string processing
Decision support systems
Decision Support Systems, Clinical
Diagnosis
Diagnosis, Differential
Disease classification
Exact sciences and technology
Female
Hand - physiology
Handwriting
Headache. Facial pains. Syncopes. Epilepsia. Intracranial hypertension. Brain oedema. Cerebral palsy
Humans
In-air movement
Internal Medicine
Male
Markers
Medical sciences
Memory organisation. Data processing
Micrographia
Middle Aged
Models and simulation
Motor Skills
Movement
Nervous system (semeiology, syndromes)
Neurology
Other
Parkinson Disease - diagnosis
Parkinson Disease - physiopathology
Parkinson's disease
Patients
Pattern recognition. Digital image processing. Computational geometry
Reproducibility of Results
Software
Support Vector Machine
Title Analysis of in-air movement in handwriting: A novel marker for Parkinson's disease
URI https://www.clinicalkey.com/#!/content/1-s2.0-S0169260714003204
https://www.clinicalkey.es/playcontent/1-s2.0-S0169260714003204
https://dx.doi.org/10.1016/j.cmpb.2014.08.007
https://www.ncbi.nlm.nih.gov/pubmed/25261003
https://www.proquest.com/docview/1629960886
https://www.proquest.com/docview/1635042780
https://www.proquest.com/docview/1651430033
Volume 117
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