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Handwriting as detector: Scientists learn to evaluate the psyche with lasers

Handwriting as detector: Scientists learn to evaluate the psyche with lasers

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Scientists at the National Research Nuclear University MEPhI along with foreign colleagues have studied the biomechanics of hand movements when writing and drawing and developed a unique method to evaluate the individual properties of writing speed and pencil pressure. The research results were published in the journal Laser Physics Letters. The researchers used a dynamic light scattering method. Passing through dense opaque matter (bio-tissues or paper), laser radiation scatters on their internal structural elements and decays into many subtle composite light rays. The scattered parts interfere, resulting in the formation of zones of positive and negative interference, called laser speckles. If there is any movement in the medium, a tremor in the interference speckle pattern is observed. Analysing speckle tremors allows for a quantitative assessment of the structural properties of a light-scattering medium. “The method of laser speckle analysis is very sensitive to any mechanical…
Source: Handwriting as detector: Scientists learn to evaluate the psyche with lasers

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