Evaluation of task difficulty based on fluctuation characteristics in writing task

  • Keisuke Tanaka
  • Ken Arai
  • Masafumi UchidaEmail author
Original Article


Control of voluntary movements is a dual structure of cognitive and physical controls. Cognitive control involves attentional resources, whereas physical control does not. In this study, we evaluated the dependency on attentional resources while learning to perform physical exercises using the relationship between the attentional resources and fluctuations in body movements. The physical exercise to be learned is the process of writing certain Chinese characters by hand. Detrended fluctuation analysis was applied to the analysis of body movement fluctuations in this study. We herein propose an index that qualitatively evaluates fluctuations locally on a timescale and includes a general scaling index on the detrended fluctuation analysis. We investigate and analyze the fluctuation characteristics in the handwriting process of three Kanji characters using this index. Moreover, we examine the relationship among the six handwriting time elements defined in the handwriting process, the handwriting difficulty of the three Kanji characters, and the timescale.


Handwriting task Fluctuation One-over-f fluctuation White noise Detrended fluctuation analysis 



This work was supported by JSPS KAKENHI Grant-in-Aid for Scientific Research (C) Number 17K00477. The authors would like to thank Enago ( for the English language review.


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Copyright information

© International Society of Artificial Life and Robotics (ISAROB) 2019

Authors and Affiliations

  1. 1.The Graduate School of Informatics and EngineeringThe University of Electro-CommunicationsChofu, TokyoJapan

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