TY - JOUR
T1 - Entropy-based analysis of rhythmic tapping for the quantitative assessment of cerebellar ataxia
AU - Nguyen, Khoa D.
AU - Pathirana, Pubudu N.
AU - Horne, Malcolm
AU - Power, Laura
AU - Szmulewicz, David J.
PY - 2020/5
Y1 - 2020/5
N2 - The severity of appendicular ataxia is currently assessed by neurological specialists observing the motor deficits during the performance of bedside tests. These tests are traditionally restricted to discrete subjective scales and prescribed by constraints that may in turn affect the subject's performance. To overcome these limitations and facilitate uniform monitoring of cerebellar ataxia, an instrumented assessment system using a wearable sensor has been developed for the rhythmic finger and foot tapping tasks. Departing from the conventional obligation to spatiotemporal parameters that are described clinically, the proposed approach investigates features based on information theory to evaluate the variability of the tapping dynamics. From a clinical trial of 24 healthy subjects and 34 patients diagnosed with cerebellar ataxia (CA), the findings revealed not only are there more variations in movement patterns and timing of tapping events in CA but that movement complexity was also degraded across multiple entropy scales. The system using combined models of different features was able to achieve an average classification accuracy of 81% and 79% in finger and foot tapping respectively. The outcomes strongly agreed with the clinical scale widely-used for the assessment and rating of ataxia (SARA) to a correlation level of 0.71 (p < 0.001) in finger tapping and 0.59 (p < 0.001) in foot tapping.
AB - The severity of appendicular ataxia is currently assessed by neurological specialists observing the motor deficits during the performance of bedside tests. These tests are traditionally restricted to discrete subjective scales and prescribed by constraints that may in turn affect the subject's performance. To overcome these limitations and facilitate uniform monitoring of cerebellar ataxia, an instrumented assessment system using a wearable sensor has been developed for the rhythmic finger and foot tapping tasks. Departing from the conventional obligation to spatiotemporal parameters that are described clinically, the proposed approach investigates features based on information theory to evaluate the variability of the tapping dynamics. From a clinical trial of 24 healthy subjects and 34 patients diagnosed with cerebellar ataxia (CA), the findings revealed not only are there more variations in movement patterns and timing of tapping events in CA but that movement complexity was also degraded across multiple entropy scales. The system using combined models of different features was able to achieve an average classification accuracy of 81% and 79% in finger and foot tapping respectively. The outcomes strongly agreed with the clinical scale widely-used for the assessment and rating of ataxia (SARA) to a correlation level of 0.71 (p < 0.001) in finger tapping and 0.59 (p < 0.001) in foot tapping.
KW - Cerebellar ataxia
KW - Information theory
KW - Mobile health informatics
KW - Rhythmic tapping
KW - Wearable inertial system
UR - http://www.scopus.com/inward/record.url?scp=85080133639&partnerID=8YFLogxK
U2 - 10.1016/j.bspc.2020.101916
DO - 10.1016/j.bspc.2020.101916
M3 - Article
AN - SCOPUS:85080133639
SN - 1746-8094
VL - 59
JO - Biomedical Signal Processing and Control
JF - Biomedical Signal Processing and Control
M1 - 101916
ER -