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DUAL measurements were taken from Child A, Child B, and Child C, respectively paired with their nursery teacher, to visualize any mental interactions with the teacher. The authors adopted finger pulse waves as a piece of biological data and used DUAL measurement to calculate mental flexibility (Largest Lyapunov Exponent: LLE) and autonomic nerve balance (ANB). Subjects are child with reactive attachment disorder (RAD; Child A), child with autism spectrum disorder (ASD; Child B), and control child (CC; Child C). As for Child A, there was correlation between the LLE of parallel measurement and the LLE of face-to-face measurement (r=0.91 (p=0.03)). As for Child B, there was correlation between the ANB of parallel measurement and the ANB of face-to-face measurement (r=0.93 (p=0.01)). As for Child C, there was a negative correlation between the ANB of parallel measurement and the LLE of parallel measurement (r=-0.89 (p=0.01)). There were no changes in the mental fluctuations of RAD, despite changes in situation between parallel measurement and face-to-face measurement. It can be said that tendencies in mental fluctuations that occur by interaction with other people are constant between parallel measurement and face-to-face measurement. In conclusion, regarding RAD, this study observed mental fluctuations shown in LLE, and regarding ASD, this study observed autonomic nerve balance shown in ANB. This study observed a relationship between the autonomic nerve balance shown in ANB and the mental fluctuations shown in LLE. This led to the understanding that an interrelation of ANB and LLE is related to the communication of the control child when parallel. In terms of the mechanism of communicative ability, a mental factor is relevant for RAD, while autonomic nerve balance is relevant for ASD. In addition, it is ANB and LLE that have relevance for CC. We would like to conduct further research to track mental states of children with reactive attachment disorder and autism spectrum disorder, by using finger pulse waves data as relevant biological information.

Characteristics of Attachment Disorder and Autism Spectrum Disorder Based on Fingertip Pulse Wave Data