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Tsiartas A, Baker FC, Smith D, de Zambotti M. A novel Hot-Flash classification algorithm via multi-sensor features integration. Annu Int Conf IEEE Eng Med Biol Soc 2021; 2021:2067-2070. [PMID: 34891695 DOI: 10.1109/embc46164.2021.9629627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
We aim to evaluate the feasibility and performance of a novel hot flash (HF) classification algorithm based on multisensor features integration using commercial wearable sensors. First, we processed feature sets from wrist-based multi-sensor data (photoplethysmography, motion, temperature, skin conductance and). Then, we classified (Decision Tree) physiological-recorded HFs (N=27) recorded from three menopause women, and we assessed the algorithm performance against gold-standard HF expert evaluation. The results indicated that while skin conductance features alone explain most of the variance (~65%) in HF classification, the multi-sensor approach achieved above 90% sensitivity at 95.6% specificity in HF classification and showed advantages under conditions of signal corruption and different biobehavioral states (sleep vs wake). The proposed new multi-sensor approach showed being promising in HF classification using common commercially-available wearable sensors and target locations.Clinical Relevance- The development of "user-centered" accurate, automatic detection systems for HFs can advance the measurement and treatment of HFs.
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Marmar CR, Brown AD, Qian M, Laska E, Siegel C, Li M, Abu-Amara D, Tsiartas A, Richey C, Smith J, Knoth B, Vergyri D. Speech-based markers for posttraumatic stress disorder in US veterans. Depress Anxiety 2019; 36:607-616. [PMID: 31006959 PMCID: PMC6602854 DOI: 10.1002/da.22890] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Revised: 02/14/2019] [Accepted: 03/08/2019] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND The diagnosis of posttraumatic stress disorder (PTSD) is usually based on clinical interviews or self-report measures. Both approaches are subject to under- and over-reporting of symptoms. An objective test is lacking. We have developed a classifier of PTSD based on objective speech-marker features that discriminate PTSD cases from controls. METHODS Speech samples were obtained from warzone-exposed veterans, 52 cases with PTSD and 77 controls, assessed with the Clinician-Administered PTSD Scale. Individuals with major depressive disorder (MDD) were excluded. Audio recordings of clinical interviews were used to obtain 40,526 speech features which were input to a random forest (RF) algorithm. RESULTS The selected RF used 18 speech features and the receiver operating characteristic curve had an area under the curve (AUC) of 0.954. At a probability of PTSD cut point of 0.423, Youden's index was 0.787, and overall correct classification rate was 89.1%. The probability of PTSD was higher for markers that indicated slower, more monotonous speech, less change in tonality, and less activation. Depression symptoms, alcohol use disorder, and TBI did not meet statistical tests to be considered confounders. CONCLUSIONS This study demonstrates that a speech-based algorithm can objectively differentiate PTSD cases from controls. The RF classifier had a high AUC. Further validation in an independent sample and appraisal of the classifier to identify those with MDD only compared with those with PTSD comorbid with MDD is required.
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Affiliation(s)
- Charles R. Marmar
- Department of Psychiatry, New York University School of Medicine, New York, New York; Steven and Alexandra Cohen Veterans Center for the Study of Post-Traumatic Stress and Traumatic Brain Injury, New York, New York,Corresponding Author: Charles R. Marmar, MD - Department of Psychiatry, New York University School of Medicine, 1 Park Avenue, New York, NY 10016,
| | - Adam D. Brown
- Department of Psychiatry, New York University School of Medicine, New York, New York; Steven and Alexandra Cohen Veterans Center for the Study of Post-Traumatic Stress and Traumatic Brain Injury, New York, New York,Department of Psychology, New School for Social Research, New York, New York
| | - Meng Qian
- Department of Psychiatry, New York University School of Medicine, New York, New York; Steven and Alexandra Cohen Veterans Center for the Study of Post-Traumatic Stress and Traumatic Brain Injury, New York, New York
| | - Eugene Laska
- Department of Psychiatry, New York University School of Medicine, New York, New York; Steven and Alexandra Cohen Veterans Center for the Study of Post-Traumatic Stress and Traumatic Brain Injury, New York, New York
| | - Carole Siegel
- Department of Psychiatry, New York University School of Medicine, New York, New York; Steven and Alexandra Cohen Veterans Center for the Study of Post-Traumatic Stress and Traumatic Brain Injury, New York, New York
| | - Meng Li
- Department of Psychiatry, New York University School of Medicine, New York, New York; Steven and Alexandra Cohen Veterans Center for the Study of Post-Traumatic Stress and Traumatic Brain Injury, New York, New York
| | - Duna Abu-Amara
- Department of Psychiatry, New York University School of Medicine, New York, New York; Steven and Alexandra Cohen Veterans Center for the Study of Post-Traumatic Stress and Traumatic Brain Injury, New York, New York
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Chaspari T, Tsiartas A, Stein Duker LI, Cermak SA, Narayanan SS. EDA-gram: designing electrodermal activity fingerprints for visualization and feature extraction. Annu Int Conf IEEE Eng Med Biol Soc 2017; 2016:403-406. [PMID: 28268358 DOI: 10.1109/embc.2016.7590725] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Wearable technology permeates every aspect of our daily life increasing the need of reliable and interpretable models for processing the large amount of biomedical data. We propose the EDA-Gram, a multidimensional fingerprint of the electrodermal activity (EDA) signal, inspired by the widely-used notion of spectrogram. The EDA-Gram is based on the sparse decomposition of EDA from a knowledge-driven set of dictionary atoms. The time axis reflects the analysis frames, the spectral dimension depicts the width of selected dictionary atoms, while intensity values are computed from the atom coefficients. In this way, EDA-Gram incorporates the amplitude and shape of Skin Conductance Responses (SCR), which comprise an essential part of the signal. EDA-Gram is further used as a foundation for signal-specific feature design. Our results indicate that the proposed representation can accentuate fine-grain signal fluctuations, which might not always be apparent through simple visual inspection. Statistical analysis and classification/regression experiments further suggest that the derived features can differentiate between multiple arousal levels and stress-eliciting environments for two datasets.
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Abstract
Biometric sensors and portable devices are being increasingly embedded into our everyday life, creating the need for robust physiological models that efficiently represent, analyze, and interpret the acquired signals. We propose a knowledge-driven method to represent electrodermal activity (EDA), a psychophysiological signal linked to stress, affect, and cognitive processing. We build EDA-specific dictionaries that accurately model both the slow varying tonic part and the signal fluctuations, called skin conductance responses (SCR), and use greedy sparse representation techniques to decompose the signal into a small number of atoms from the dictionary. Quantitative evaluation of our method considers signal reconstruction, compression rate, and information retrieval measures, that capture the ability of the model to incorporate the main signal characteristics, such as SCR occurrences. Compared to previous studies fitting a predetermined structure to the signal, results indicate that our approach provides benefits across all aforementioned criteria. This paper demonstrates the ability of appropriate dictionaries along with sparse decomposition methods to reliably represent EDA signals and provides a foundation for automatic measurement of SCR characteristics and the extraction of meaningful EDA features.
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Affiliation(s)
- Theodora Chaspari
- Signal Analysis and Interpretation Laboratory, Ming Hsieh Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089 USA
| | | | - Leah I. Stein
- Division of Occupational Science and Occupational Therapy, Herman Ostrow School of Dentistry, University of Southern California
| | - Sharon A. Cermak
- Division of Occupational Science and Occupational Therapy, Herman Ostrow School of Dentistry, University of Southern California
| | - Shrikanth S. Narayanan
- Signal Analysis and Interpretation Laboratory, Ming Hsieh Department of Electrical Engineering, University of southern California
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Abstract
Pathological speech usually refers to the condition of speech distortion resulting from atypicalities in voice and/or in the articulatory mechanisms owing to disease, illness or other physical or biological insult to the production system. Although automatic evaluation of speech intelligibility and quality could come in handy in these scenarios to assist experts in diagnosis and treatment design, the many sources and types of variability often make it a very challenging computational processing problem. In this work we propose novel sentence-level features to capture abnormal variation in the prosodic, voice quality and pronunciation aspects in pathological speech. In addition, we propose a post-classification posterior smoothing scheme which refines the posterior of a test sample based on the posteriors of other test samples. Finally, we perform feature-level fusions and subsystem decision fusion for arriving at a final intelligibility decision. The performances are tested on two pathological speech datasets, the NKI CCRT Speech Corpus (advanced head and neck cancer) and the TORGO database (cerebral palsy or amyotrophic lateral sclerosis), by evaluating classification accuracy without overlapping subjects' data among training and test partitions. Results show that the feature sets of each of the voice quality subsystem, prosodic subsystem, and pronunciation subsystem, offer significant discriminating power for binary intelligibility classification. We observe that the proposed posterior smoothing in the acoustic space can further reduce classification errors. The smoothed posterior score fusion of subsystems shows the best classification performance (73.5% for unweighted, and 72.8% for weighted, average recalls of the binary classes).
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Affiliation(s)
- Jangwon Kim
- Signal Analysis and Interpretation Laboratory (SAIL) , University of Southern California, 3710 McClintock Ave., Los Angeles, CA 90089, USA
| | - Naveen Kumar
- Signal Analysis and Interpretation Laboratory (SAIL) , University of Southern California, 3710 McClintock Ave., Los Angeles, CA 90089, USA
| | - Andreas Tsiartas
- Signal Analysis and Interpretation Laboratory (SAIL) , University of Southern California, 3710 McClintock Ave., Los Angeles, CA 90089, USA
| | - Ming Li
- Signal Analysis and Interpretation Laboratory (SAIL) , University of Southern California, 3710 McClintock Ave., Los Angeles, CA 90089, USA
| | - Shrikanth S Narayanan
- Signal Analysis and Interpretation Laboratory (SAIL) , University of Southern California, 3710 McClintock Ave., Los Angeles, CA 90089, USA ; Department of Electrical Engineering, Computer Science, Linguistics and Psychology, University of Southern California (USC), 3620 McClintock Ave., Los Angeles, CA 90089, USA
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