Volume 85, Number 5, March 2009
Article Number 58007
Number of page(s) 6
Section Interdisciplinary Physics and Related Areas of Science and Technology
Published online 20 March 2009
EPL, 85 (2009) 58007
DOI: 10.1209/0295-5075/85/58007

Fluctuation analysis of proficient and dysgraphic handwriting in children

S. Rosenblum1 and H. E. Roman2

1   Department of Occupational Therapy, Faculty of Social Welfare & Health Sciences, University of Haifa Mount Carmel, Haifa 31905, Israel
2   Dipartimento di Fisica, Università di Milano-Bicocca - Piazza della Scienza 3, 20126 Milano, Italy, EU

received 26 November 2008; accepted in final form 16 February 2009; published March 2009
published online 20 March 2009

We analyze handwriting records from several school children with the aim of characterizing the fluctuating behavior of the writing speed. It will be concluded that remarkable differences exist between proficient and dysgraphic handwritings which were unknown so far. It is shown that in the case of proficient handwriting, the variations in handwriting speed are strongly autocorrelated within times corresponding to the completion of a single character or letter, while become uncorrelated at longer times. In the case of dysgraphia, such correlations persist on longer time scales and the autocorrelation function seems to display algebraic time decay, indicating the presence of strong anomalies in the handwriting process. Applications of the results in educational/clinical programs are envisaged.

PACS - Learning and memory.
05.40.-a - Fluctuation phenomena, random processes, noise, and Brownian motion.
05.45.Tp - Time series analysis.

© EPLA 2009