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Proceeding Paper

Artificial Intelligence-Based Effective Detection of Parkinson’s Disease Using Voice Measurements †

by
Gogulamudi Pradeep Reddy
1,
Duppala Rohan
2,
Yellapragada Venkata Pavan Kumar
3,*,
Kasaraneni Purna Prakash
4 and
Mandarapu Srikanth
3
1
Department of Information and Communication Technology, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576104, Karnataka, India
2
School of Computer Science and Engineering, VIT-AP University, Amaravati 522237, Andhra Pradesh, India
3
School of Electronics Engineering, VIT-AP University, Amaravati 522237, Andhra Pradesh, India
4
Department of Computer Science and Engineering, Koneru Lakshmaiah Education Foundation, Vaddeswaram 522502, Andhra Pradesh, India
*
Author to whom correspondence should be addressed.
Presented at the 11th International Electronic Conference on Sensors and Applications (ECSA-11), 26–28 November 2024; Available online: https://sciforum.net/event/ecsa-11.
Eng. Proc. 2024, 82(1), 28; https://doi.org/10.3390/ecsa-11-20481
Published: 26 November 2024

Abstract

Parkinson’s disease (PD) is a neurodegenerative illness that affects the central nervous system and leads to a gradual degeneration of neurons that results in movement slowness, mental health problems, speaking difficulties, etc. In the past 20 years, the frequency of PD has doubled. Global estimates revealed that over 8.5 million cases have been identified so far. Thus, early and accurate detection of PD is crucial for treatment. Traditional detection methods are subjective and prone to delays, as they are reliant on clinical evaluation and imaging. Alternatively, artificial intelligence (AI) has recently emerged as a transformative technology in the healthcare sector, showing decent and promising results. However, an effective algorithm needs to be investigated for the most accurate prediction of a particular disease. Thus, this paper explores the ability of different machine learning algorithms in regard to the effective detection of PD. A total of 26 algorithms were implemented using the Scikit-Learn library on the Oxford PD detection dataset. This is a collection of 195 voice measurements recorded from 31 individuals, of which 23 have PD. The implemented algorithms are logistic regression, decision tree, k-nearest neighbors, random forest, support vector machine, Gaussian naïve bayes, multi-layered perceptron (MLP), extreme gradient boosting, adaptive boosting, stochastic gradient descent, gradient boosting machine, extra tree classifier, light gradient boosting machine, categorical boosting, Bernoulli naïve bayes, complement naïve bayes, multinomial naïve bayes, histogram-based gradient boosting, nearest centroid, radius neighbors classifier, logistic regression with elastic net regularization, extreme learning machine, ridge classifier, huber classifier, perceptron classifier, and voting classifier. Among them, MLP outperformed the other algorithms with a testing accuracy of 95%, precision of 94%, sensitivity of 100%, F1 score of 97%, and AUC of 98%. Thus, it successfully discriminates healthy individuals from those with PD, thereby helping for accurate early detection of PD for new patients using their voice measurements.

1. Introduction

Parkinson’s disease (PD) is a long-standing degenerative disorder that progressively damages the brain, leading to the gradual worsening of nerve cells. It is characterized by a combination of motor and non-motor symptoms. The most common motor symptoms include tremors (involuntary shaking), muscle rigidity (stiffness), and others. These symptoms can significantly hinder a person’s capacity to perform everyday tasks, diminishing their overall quality of life. Besides motor symptoms, PD is linked to a variety of non-motor symptoms as well. These include difficulties with thinking and memory, emotional disorders, problems with sleep, feeling tired, and challenges with speaking. While PD is most commonly diagnosed in older adults, it can also affect younger individuals, a condition referred to as early-onset PD. Men have a greater likelihood of developing PD compared to women. Genetic factors play a role as well; individuals with a family history of PD are more likely to have this disease. Environmental factors also contribute to the risk of developing PD. Prolonged exposure to air pollution, pesticides, and certain solvents may increase the likelihood of developing PD. Over the last 25 years, the occurrence of PD has doubled, making it the fastest-growing neurological disorder worldwide. As the global population continues to age, this number is expected to rise, highlighting the need for effective methods of early detection, diagnosis, and management to mitigate the disease’s impact on individuals and healthcare systems.
Artificial intelligence (AI) is reshaping the healthcare sector by enhancing accuracy, efficiency, and accessibility in medical care. It is revolutionizing multiple facets of healthcare. Machine learning (ML) algorithms analyze vast amounts of complex medical data such as wearable sensor data, patient demographic information, and clinical trial data to detect patterns and generate predictions. This capability enables earlier disease detection, more accurate diagnoses, and customized treatment plans that improve patient outcomes. Moreover, AI-powered tools are reducing healthcare professionals’ workloads by automating routine tasks, streamlining administrative processes, and optimizing resource allocation, allowing providers to focus more on direct patient care. AI encompasses various types based on functionality and capability, such as Narrow AI (or Weak AI), General AI (or Artificial General Intelligence, AGI), and Super-Intelligent AI. Recent advancements in AI include Attention Mechanisms, Explainable AI (XAI), Federated Learning, and Generative AI, which encompasses models such as GANs, VAEs, Transformer-based models, Diffusion models, Autoregressive models, and Large Language Models (LLMs) [1,2]. As AI continues to evolve, it holds immense potential to bridge gaps in healthcare access, reduce costs, and enhance the quality of care on a global scale.
This paper explores the effectiveness of different ML algorithms in predicting PD, emphasizing early diagnosis and the development of a robust detection technique. These ML algorithms were realized using the Scikit-Learn library on the Oxford Parkinson’s Disease detection dataset [3]. The rest of the paper is ordered as follows: Related Works, Methodology, Results and Discussion, and Conclusion. Section 2 discusses Related Works on the early diagnosis and prediction of PD. Section 3 describes the execution flow for the entire work presented in the paper. Section 4 demonstrates the experimental results, whereas Section 5 covers the conclusions and future directions.

2. Related Works

The early detection of PD has become a critical area of research, with a significant focus on leveraging AI and ML techniques to identify biomarkers and detect the disease at its initial stages. Speech analysis has become an essential tool in this context due to its high sensitivity to the effects of PD. Often considered a “black box” of hidden information, speech signals can be analyzed to detect PD, Alzheimer’s disease, depression, and other neurological disorders by extracting relevant features from these signals [4]. For example, a study proposed an automatic PD detection system using a support vector machine (SVM) combined with a wrapper feature selection technique to enhance diagnostic accuracy [5]. Furthermore, the development of new features, such as the Intrinsic Mode Function Cepstral Coefficient (IMFCC), has shown a significant increase in the detection accuracy of PD by addressing changes in speech intelligibility affected by PD symptoms like phonation, intensity, articulation, and respiration [6]. Voice abnormalities, which affect about 90% of PD patients, are among the initial signs and symptoms of the disease. The introduction of features like the direction of energy based on empirical mode decomposition has also demonstrated promising results in precisely distinguishing PD patients from healthy persons [7]. Additionally, convolutional neural networks have been employed to extract information from dysarthric speech, increasing the accuracy of detecting subtle voice alterations associated with PD. These vowel-based recordings offer a practical, non-invasive screening tool that can be utilized in both clinical and home settings [8]. Beyond speech analysis, there have been numerous developments in utilizing various biomarkers for PD detection. ML techniques have been utilized to distinguish individuals with PD from healthier ones by addressing class imbalance and hyperparameter tuning, such as using SMOTE and RandomizedSearchCV [9]. Several studies have focused on identifying biomarkers for disease progression. For example, research has shown serum neurofilament light to be a strong indicator for rapid disease progression between three identified types of PD progression [10]. Another study emphasized the need for objective biomarkers for early intervention, demonstrating that an ML model using a validated mass spectrometry assay could identify Parkinson’s patients with good accuracy and classify a significant percentage of pre-motor individuals [11]. Furthermore, the role of peripheral cytokines has been investigated, providing evidence that they may assist in ML-based PD detection [12].
AI has also been applied to analyze other physiological signals. Nocturnal breathing patterns, for instance, have been used to develop an AI model that can identify PD and track its progression. By decoding breathing patterns from radio waves as a person sleeps, the model provides a non-invasive, at-home solution for early detection and continuous monitoring of PD [13]. Gait analysis, another method explored for PD detection, employed an ML-based classification system that utilized correlation feature selection techniques to identify salient biomarkers from spatial and temporal features, further validated using the Shapiro–Wilk test for normal data distribution [14]. In addition to speech and gait, studies have utilized various imaging and signal-processing techniques to detect PD. One approach converted electroencephalographic recordings into spectrograms using the Gabor transform, classifying individuals into various categories such as healthy, with PD, and without medication [15]. Video analysis has also been employed; facial expressions of people with dysarthria were evaluated using video recordings, and synthetic data for training augmentation was generated using a Conditional Generative Adversarial Network, with Test-Time Augmentation reducing outcome bias [16]. Furthermore, online handwriting analysis has been explored using beta elliptical approaches and fuzzy perceptual detectors for feature extraction, with Bidirectional Long Short-Term Memory networks being implemented to improve classification accuracy [17,18].
Several comparative studies have been undertaken to evaluate the effectiveness of different ML algorithms in PD detection. A study compared deep learning models, 12 ML algorithms, and ensemble learning methods, highlighting the use of boosting techniques to enhance detection performance [19]. Another approach utilized Gower distance as a dissimilarity measure and the Cuckoo Search algorithm for feature selection, further optimizing PD detection models [20].
Despite the significant advancements in utilizing AI and ML for the detection and monitoring of PD, there remains a demanding need for further research to develop more effective methods. While existing studies have made considerable progress in identifying the disease, gaps still exist in achieving optimal diagnostic performance. In this view, this paper addresses these gaps by evaluating a comprehensive set of various ML algorithms. The aim is to identify the most effective techniques for early diagnosis and to develop a robust and standardized method for detecting PD.

3. Methodology

The methodology for this research involves several steps, including data splitting, model training, evaluation, and hyperparameter tuning, as depicted in Figure 1. The dataset used is the Oxford Parkinson’s Disease detection dataset, which includes 22 features across 197 instances, containing biomedical voice measurements of individuals with and without PD. The target variable (‘status’) indicates the presence (1) or absence (0) of PD, with the features representing a comprehensive range of voice characteristics typically affected by PD, thereby facilitating effective disease detection. The dataset was divided randomly, with 80% being allocated for training and 20% being reserved for testing. The training set was used to train ML models while the testing set evaluated their performance. A total of 26 ML algorithms were implemented using the Scikit-Learn library in Python, with each algorithm being applied to the training data to predict the target variable. To optimize the models’ performance, hyperparameter tuning was performed using techniques such as grid search and random search, systematically testing different combinations of model parameters to determine the optimal configuration for the best predictive performance on the validation set. The effectiveness of each ML model was assessed using 5 evaluation metrics (accuracy, precision, sensitivity, area under the curve, and F1 score), providing a comprehensive evaluation of the models’ ability to detect PD accurately and minimize false positives.

4. Results and Discussion

In this experiment, the results achieved from various algorithms provide significant insights into the detection of PD and are detailed as follows. Logistic regression (LR) was implemented two times. The first time, it was directly implemented on the dataset. The second time, LR was implemented with ElasticNet regularization (LR + EN). The penalty was set to ‘elasticnet’ and the l1_ratio was set to 0.5, indicating a balance between L1 and L2 regularization. Decision tree (DT) and random forest (RF) were implemented with a maximum depth of 5 each. Implementing the K-nearest neighbors (KNNs) produced a testing accuracy of 95% when the nearest neighbors were set to 5. The Radius Neighbor Classifier (RNC) and nearest centroid (NC) could not perform well. The SVMs have shown a decent performance, training, and testing accuracy of 90% each. Four variants of Naïve Bayes were used in this experiment: Gaussian naïve bayes (GNB), Bernoulli naïve bayes (BNB), complement naïve bayes (CNB), and multinomial naïve bayes (MNB). However, they could not perform well on the dataset. Among multi-layered perceptron (MLP), perceptron classifier (PC), and extreme learning machine (ELM), MLP outperformed the others with a testing accuracy of 95%. Ridge classifier (RC) produced a testing accuracy of 92%. However, huber classifier (HC) and stochastic gradient descent (SGD) did not perform well and were not suitable for operational use in detecting PD. Among the boosting algorithms, extreme gradient boosting (XGB), gradient boosting machine (GBM), light gradient boosting machine (LGBM), categorical boosting (CB), and histogram gradient Boosting (HistGB) have outperformed most other classifiers. LR, DT, RF, KNN, SVM, MLP, XGB, adaptive boosting (ADB), SGD, GBM, extra tree classifier (ETC), LGBM, CB, HistGB, RNC, RC and LR+EN were used to implement the voting classifier (VC), which resulted in a testing accuracy of 95%, a precision of 94%, a sensitivity of 100%, an F1 score of 97%, and an AUC of 92%. It can be observed from Table 1 that MLP, XGB, GBM, ETC, LGBM, and CB produced almost similar results. They all achieved a training accuracy of 100%, a testing accuracy of 95%, a precision of 94%, a sensitivity of 100%, and an F1 score of 97%. However, the AUC made the difference, as shown in Figure 2. The XGB and GBM achieved an AUC of 93%, ETC and LGBM achieved an AUC of 95%, CB achieved an AUC of 97%, and MLP achieved an AUC of 98%. Generally, any classifier with an AUC of more than 80% can be considered good enough to contribute to the core findings of the research. However, those six classifiers achieved an AUC of more than 90%. The highest AUC was achieved for MLP with 98%, and its true positives were 32, true negatives were 5, false negatives were 0, and false positives were 2 as shown in Figure 3.

5. Conclusions

Early and precise detection of PD is critically important due to its progressive behavior and substantial impact on patients’ quality of life. This paper validates the potential of machine learning algorithms as effective tools for detecting PD using non-invasive voice measurements. A total of 26 ML algorithms were implemented on the Oxford PD detection dataset, comprising 195 voice measurements from 31 individuals. Among these algorithms, the multi-layered Perceptron (MLP) demonstrated superior performance, achieving a testing accuracy of 95%, a precision of 94%, a sensitivity of 100%, an F1 score of 97%, and an AUC of 98%. These metrics indicate that the MLP algorithm is highly effective in distinguishing between healthy individuals and those with PD based on voice data. The results highlight the significant potential of artificial intelligence (AI)-driven approaches in enhancing the early detection of PD. The use of voice measurements provides a non-invasive, cost-effective, and efficient means of screening large populations, which is particularly valuable given the increasing prevalence of the disease worldwide. Future work can be extended to validate these findings on larger, new diverse datasets and to investigate the integration of such AI models into clinical settings.

Author Contributions

Conceptualization, G.P.R.; methodology, G.P.R., D.R. and Y.V.P.K.; software, K.P.P.; formal analysis, M.S.; funding acquisition, Y.V.P.K.; investigation, G.P.R. and D.R.; Resources, K.P.P.; data curation, Y.V.P.K., M.S. and K.P.P.; supervision, Y.V.P.K.; validation, M.S.; visualization, D.R.; project administration, Y.V.P.K.; writing—original draft, G.P.R. and D.R.; writing—review and editing, Y.V.P.K., M.S. and K.P.P. All authors have read and agreed to the published version of the manuscript.

Funding

This research received no external funding.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

The original data presented in the study are openly available in Oxford Parkinson’s Disease Detection Dataset at https://archive.ics.uci.edu/dataset/174/parkinsons (accessed on 26 November 2024).

Conflicts of Interest

The authors declare no conflicts of interest.

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Figure 1. Experimental workflow for PD detection.
Figure 1. Experimental workflow for PD detection.
Engproc 82 00028 g001
Figure 2. AUC of various classifiers with (a) MLP; (b) XGB; (c) GBM; (d) ETC; (e) LGBM; (f) CB.
Figure 2. AUC of various classifiers with (a) MLP; (b) XGB; (c) GBM; (d) ETC; (e) LGBM; (f) CB.
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Figure 3. Confusion Matrix for MLP, XGB, GBM, ETC, LGBM, and CB classifiers.
Figure 3. Confusion Matrix for MLP, XGB, GBM, ETC, LGBM, and CB classifiers.
Engproc 82 00028 g003
Table 1. Results achieved with various ML classifiers.
Table 1. Results achieved with various ML classifiers.
S. No.ClassifierTraining Accuracy (%)Testing Accuracy (%)Precision (%)Sensitivity (%)F1 Score (%)AUC (%)
1LR86.589.7891009484
2DT1009294979584
3RF10095941009792
4KNN9595941009798
5SVM909091979480
6GNB697292728178
7MLP10095941009798
8XGB10095941009793
9ADB1008588949191
10SGD837787848671
11GBM10095941009793
12ETC10095941009795
13LGBM10095941009795
14CB10095941009797
15BNB 727492758387
16CNB746988727977
17MNB8290891009477
18HistGB1009294979595
19NC747489788376
20RNC7482821009058
21LR+EN8590891009483
22ELM998296818883
23RC9192911009682
24HC766491637475
25PC808791949283
26VC10095941009792
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MDPI and ACS Style

Pradeep Reddy, G.; Rohan, D.; Kumar, Y.V.P.; Prakash, K.P.; Srikanth, M. Artificial Intelligence-Based Effective Detection of Parkinson’s Disease Using Voice Measurements. Eng. Proc. 2024, 82, 28. https://doi.org/10.3390/ecsa-11-20481

AMA Style

Pradeep Reddy G, Rohan D, Kumar YVP, Prakash KP, Srikanth M. Artificial Intelligence-Based Effective Detection of Parkinson’s Disease Using Voice Measurements. Engineering Proceedings. 2024; 82(1):28. https://doi.org/10.3390/ecsa-11-20481

Chicago/Turabian Style

Pradeep Reddy, Gogulamudi, Duppala Rohan, Yellapragada Venkata Pavan Kumar, Kasaraneni Purna Prakash, and Mandarapu Srikanth. 2024. "Artificial Intelligence-Based Effective Detection of Parkinson’s Disease Using Voice Measurements" Engineering Proceedings 82, no. 1: 28. https://doi.org/10.3390/ecsa-11-20481

APA Style

Pradeep Reddy, G., Rohan, D., Kumar, Y. V. P., Prakash, K. P., & Srikanth, M. (2024). Artificial Intelligence-Based Effective Detection of Parkinson’s Disease Using Voice Measurements. Engineering Proceedings, 82(1), 28. https://doi.org/10.3390/ecsa-11-20481

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