Browsing by Author "Prokofiev Andrey O."

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Directional motion sensitivity in people with Visual Snow Syndrome is modulated by the presence of trailing-type palinopsia
    (MSUPE, 2025-01-24) Orekhova Elena V.; Naumova Sofya M.; Obukhova Tatiana S.; Plieva Anna M.; Prokofiev Andrey O.; Petrokovskaia Anastasia V.; Stroganova Tatiana A.
    Using a spatial suppression paradigm, we assessed motion duration discrimination thresholds for small (1°), medium (2.5°), and large (12°) high-contrast gratings in 23 VSS and 27 control participants. Spatial Suppression Index (SSI) quantified size-dependent increases in duration thresholds. Visual Discomfort Questionnaire scores and VSS symptom ratings including TTP, afterimages, photophobia, etc. were also collected. VSS patients reported higher visual discomfort and perceptual disturbances. However, no group differences were found in duration thresholds or SSI. Notably, higher TTP scores were associated with lower duration thresholds, indicating a facilitatory effect of TTP on motion sensitivity.
  • Thumbnail Image
    Item
    Time-dependent modulation of visual gamma oscillations points to increased neural plasticity in Visual Snow Syndrome
    (MSUPE, 2025-01-24) Orekhova Elena V.; Naumova Sofya M.; Obukhova Tatiana S.; Plieva Anna M.; Prokofiev Andrey O.; Petrokovskaia Anastasia V.; Stroganova Tatiana A.
    To explore potential alterations in E/I balance and neuroplasticity in VSS, we recorded visual gamma oscillations with magnetoencephalography in 26 patients with VSS and 27 controls participants. Excitatory drive was regulated by presenting participants with high-contrast circular gratings, static or drifting at one of four rates (0.6˚/s, 1.2˚/s, 3.6˚/s, or 6.0˚/s).