УДК: 159.93, 159.9.072, 612.8, 612.821, 004.85, 004.93’12, 004.932, 007.51

Computer analysis of monochromatic drawings by mentally healthy people and patients with schizophrenia

Pronin, S.V., Shoshina, I.I., Shelepin, Y.E.

Publication in Journal of Optical Technology

For Russian citation (Opticheskii Zhurnal):

Пронин С.В., Шошина И.И., Шелепин Ю.Е. Компьютерный анализ монохромных рисунков психически здоровых и больных шизофренией людей // Оптический журнал. 2015. Т. 82. № 10. С. 81–85.

Pronin S.V., Shoshina I.I., Shelepin Yu.E. Computer analysis of monochromatic drawings by mentally healthy people and patients with schizophrenia [in Russian] // Opticheskii Zhurnal. 2015. V. 82. № 10. P. 81–85.

For citation (Journal of Optical Technology):

S. V. Pronin, I. I. Shoshina, and Yu. E. Shelepin, "Computer analysis of monochromatic drawings by mentally healthy people and patients with schizophrenia," Journal of Optical Technology. 82(10), 707-710 (2015). https://doi.org/10.1364/JOT.82.000707

Abstract:

This paper presents the results of a comparative computer analysis of monochromatic drawings by mentally healthy subjects and patients with schizophrenia. The contours of the images were distinguished in each of the drawings, after which the following characteristics were calculated: the total length of all the contours of the image, the mean size of the image, and the ratio of the total length of the contours to the mean size. The spatial-frequency spectra of the images were also computed. It is established that the mean size of the drawings and the relative length of the contours in the drawings by the patients with schizophrenia are less than in those of the healthy subjects—i.e., the drawings of the patients with schizophrenia are less detailed. Moreover, these drawings are characterized by a certain rise of the spectrum in the region of medium spatial frequencies. As shown by a computer experiment, on the basis of an analysis of twenty arbitrarily chosen drawings by the patients with schizophrenia, a positive diagnosis can be delivered in 92% of all the cases. When the same sample of drawings by healthy subjects is analyzed, the probability of an incorrect diagnosis was 6.5%. The resulting data are regarded as evidence of dysfunction when there is schizophrenia of the magnocellular system, which provides a global analysis of the images and an increase of the internal noise level of the visual system.

Keywords:

image analysis, schizophrenia, diagnostics, spatial-frequency approach

Acknowledgements:

This investigation was carried out with the support of the Russian Scientific Foundation, Grant 14-15-00918.

OCIS codes: 070.2615, 110.2960, 170.5380, 330.6110, 330.5370, 330.7323

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