Parkinson's Disease
Adaptive Wavelet Filters as Practical Texture Feature Amplifiers for Parkinson's Disease Screening in OCT
Zhang, Xiaoqing, Shi, Hanfeng, Li, Xiangyu, Ye, Haili, Xu, Tao, Li, Na, Hu, Yan, Lv, Fan, Chen, Jiangfan, Liu, Jiang
Parkinson's disease (PD) is a prevalent neurodegenerative disorder globally. The eye's retina is an extension of the brain and has great potential in PD screening. Recent studies have suggested that texture features extracted from retinal layers can be adopted as biomarkers for PD diagnosis under optical coherence tomography (OCT) images. Frequency domain learning techniques can enhance the feature representations of deep neural networks (DNNs) by decomposing frequency components involving rich texture features. Additionally, previous works have not exploited texture features for automated PD screening in OCT. Motivated by the above analysis, we propose a novel Adaptive Wavelet Filter (AWF) that serves as the Practical Texture Feature Amplifier to fully leverage the merits of texture features to boost the PD screening performance of DNNs with the aid of frequency domain learning. Specifically, AWF first enhances texture feature representation diversities via channel mixer, then emphasizes informative texture feature representations with the well-designed adaptive wavelet filtering token mixer. By combining the AWFs with the DNN stem, AWFNet is constructed for automated PD screening. Additionally, we introduce a novel Balanced Confidence (BC) Loss by mining the potential of sample-wise predicted probabilities of all classes and class frequency prior, to further boost the PD screening performance and trustworthiness of AWFNet. The extensive experiments manifest the superiority of our AWFNet and BC over state-of-the-art methods in terms of PD screening performance and trustworthiness.
Appendix
This appendix contains the following sections: Proofs: Section A contains proofs of theoretical results presented in the main paper. Semi-Synthetic Experiment: Additional Details: Section B contains additional details and experimental results for the semi-synthetic experiment presented in Section 4. Diabetes Experiment: Additional Details: Section C contains additional details and experimental results for the real-data diabetes experiment presented in Section 5. Additional Real-Data Experiment: Parkinson's: Section D contains an additional realdata experiment, on a medical dataset of patients with Parkinson's disease. Most of our experiments were run on CPUs, with only the TARNet baseline run on a GEForce GTX GPU. We estimate the compute time to be on the order of 100 hours. Based on the definition of Y(ฯ(x)), we can write it as follows, using the fact that Y is binary. Meanwhile, E[Y | x] is a function of x alone, and so the conditional expectation is equivalent if we condition on additional information E[E[Y | x] | x] = E[E[Y | x] | X = x, A = a, X S ] as long as this conditional expectation is well-defined, which it will be wherever p(x | A = a, X S) > 0. The partially maximized population objective from Equation (6) is equivalent (up to a factor of 2) to a weighted sum of the absolute value of each agent's conditional relative agent bias. First, we will prove the following lemma: Lemma 1.
Sensory-driven microinterventions for improved health and wellbeing
Abdalla, Youssef, Gatti, Elia, Orlu, Mine, Obrist, Marianna
The five senses are gateways to our wellbeing and their decline is considered a significant public health challenge which is linked to multiple conditions that contribute significantly to morbidity and mortality. Modern technology, with its ubiquitous nature and fast data processing has the ability to leverage the power of the senses to transform our approach to day to day healthcare, with positive effects on our quality of life. Here, we introduce the idea of sensory-driven microinterventions for preventative, personalised healthcare. Microinterventions are targeted, timely, minimally invasive strategies that seamlessly integrate into our daily life. This idea harnesses human's sensory capabilities, leverages technological advances in sensory stimulation and real-time processing ability for sensing the senses. The collection of sensory data from our continuous interaction with technology - for example the tone of voice, gait movement, smart home behaviour - opens up a shift towards personalised technology-enabled, sensory-focused healthcare interventions, coupled with the potential of early detection and timely treatment of sensory deficits that can signal critical health insights, especially for neurodegenerative diseases such as Parkinson's disease.
Central and Central-Parietal EEG Signatures of Parkinson's Disease
This study investigates EEG as a potential early biomarker by applying deep learning techniques to resting-state EEG recordings from 31 subjects (15 with PD and 16 healthy controls). EEG signals were rigorously preprocessed to remove tremor artifacts, then converted to wavelet-based images by grouping spatially adjacent electrodes into triplets for convolutional neural network (CNN) classification. Our analysis across different brain regions and frequency bands showed distinct spatial-spectral patterns of PD-related neural oscillations. We identified high classification accuracy (74%) in the gamma band (40-62.4 Hz) for central-parietal electrodes (CP1, Pz, CP2), and 76% accuracy using central electrodes (C3, Cz, C4) with full-spectrum 0.4-62.4 Hz. In particular, we observed pronounced right-hemisphere involvement, specifically in parieto-occipital regions. Unlike previous studies that achieved higher accuracies by potentially including tremor artifacts, our approach isolates genuine neurophysiological alterations in cortical activity. These findings suggest that specific EEG-based oscillatory patterns, especially central-parietal gamma activity, may provide diagnostic information for PD, potentially before the onset of motor symptoms.
Bilingual Dual-Head Deep Model for Parkinson's Disease Detection from Speech
La Quatra, Moreno, Orozco-Arroyave, Juan Rafael, Siniscalchi, Marco Sabato
This work aims to tackle the Parkinson's disease (PD) detection problem from the speech signal in a bilingual setting by proposing an ad-hoc dual-head deep neural architecture for type-based binary classification. One head is specialized for diadochokinetic patterns. The other head looks for natural speech patterns present in continuous spoken utterances. Only one of the two heads is operative accordingly to the nature of the input. Speech representations are extracted from self-supervised learning (SSL) models and wavelet transforms. Adaptive layers, convolutional bottlenecks, and contrastive learning are exploited to reduce variations across languages. Our solution is assessed against two distinct datasets, EWA-DB, and PC-GITA, which cover Slovak and Spanish languages, respectively. Results indicate that conventional models trained on a single language dataset struggle with cross-linguistic generalization, and naive combinations of datasets are suboptimal. In contrast, our model improves generalization on both languages, simultaneously.