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Differences in fractal patterns and characteristic periodicities between word salads and normal sentences: Interference of meaning and sound

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  • Jun Shimizu
  • Hiromi Kuwata
  • Kazuo Kuwata

Abstract

Fractal dimensions and characteristic periodicities were evaluated in normal sentences, computer-generated word salads, and word salads from schizophrenia patients, in both Japanese and English, using the random walk patterns of vowels. In normal sentences, the walking curves were smooth with gentle undulations, whereas computer-generated word salads were rugged with mechanical repetitions, and word salads from patients with schizophrenia were unreasonably winding with meaningless repetitive patterns or even artistic cohesion. These tendencies were similar in both languages. Fractal dimensions between normal sentences and word salads of schizophrenia were significantly different in Japanese [1.19 ± 0.09 (n = 90) and 1.15 ± 0.08 (n = 45), respectively] and English [1.20 ± 0.08 (n = 91), and 1.16 ± 0.08 (n = 42)] (p 10) periodicities between normal sentences and word salads from schizophrenia patients were predominantly observed at 25.6 (p 10) presented here are sensitive to discriminate between schizophrenia and healthy mental state, and could be implemented in social robots to assess the mental state of people in care.

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  • Jun Shimizu & Hiromi Kuwata & Kazuo Kuwata, 2021. "Differences in fractal patterns and characteristic periodicities between word salads and normal sentences: Interference of meaning and sound," PLOS ONE, Public Library of Science, vol. 16(2), pages 1-13, February.
  • Handle: RePEc:plo:pone00:0247133
    DOI: 10.1371/journal.pone.0247133
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    References listed on IDEAS

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    1. Yukie Sano & Hideki Takayasu & Shlomo Havlin & Misako Takayasu, 2019. "Identifying long-term periodic cycles and memories of collective emotion in online social media," PLOS ONE, Public Library of Science, vol. 14(3), pages 1-17, March.
    2. Derya Çokal & Vitor Zimmerer & Douglas Turkington & Nicol Ferrier & Rosemary Varley & Stuart Watson & Wolfram Hinzen, 2019. "Disturbing the rhythm of thought: Speech pausing patterns in schizophrenia, with and without formal thought disorder," PLOS ONE, Public Library of Science, vol. 14(5), pages 1-14, May.
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