Motion-Based Acuity Task: Full Visual Field Measurement of Shape and Motion Perception

Kozak, Anna; Wieteska, Michał; Ninghetto, Marco; Szulborski, Kamil; Gałecki, Tomasz; Szaflik, Jacek P.; Burnat, Kalina

doi:10.1167/tvst.10.1.9

Cited by 3 publications

(3 citation statements)

References 22 publications

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“…For the contrast-dependent motion stimulation we know much less: previously the behavioral best accuracy was shown for positive contrast slow velocity bar detection 26 . Here we apply the motion-acuity task in two contrasts engaging both stationary and motion perception 23,24 . In line with facilitation for positive contrast slow motion 26 , we show that the easiest task for healthy controls was the slow velocity positive contrast motion-acuity task compared to the high-velocity negative contrast motion-acuity task, irrespective of full or limited visual condition.…”

Section: Discussionmentioning

confidence: 99%

“…We used a motion-acuity test 23,24 (Kozak et al, 2021;Ninghetto et al, 2024) in which participants had to discriminate between a circle (S+) and a vertically oriented ellipse (S-), composed of an RDK separated from the RDK background by the dots' velocity. S+, S-and the background consisted of dots moving coherently upward; dots within S+/-moved slower than the background dots.…”

Section: Motion-acuity Taskmentioning

confidence: 99%

“…Taking into account these limitations, we aimed to simultaneously explore motion and shape perception at the central and peripheral vision in healthy cohorts and in RP patients using a motion-acuity task developed by us 23,24 . We measured acuity thresholds and motion perception simultaneously, using high and slow velocities and dark or light motion signals.…”

Section: Introductionmentioning

confidence: 99%

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Quest for good vision without peripheries - behavioral and fMRI evidence

Ninghetto,

Kozak,

Gałecki

et al. 2024

Preprint

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In healthy vision, bright slow-motion stimuli are primarily processed by regions of the visual system receiving input from the central part of the scene, while processing of the dark fast-motion stimuli is more dependent on the peripheral visual input. We tested 31 retinitis pigmentosa patients (RP) with long-term loss of peripheral photoreceptors and healthy controls with temporarily limited peripheral vision. We measured motion-based acuity, using random-dot kinematograms, establishing individual thresholds for differentiating circle from an ellipse. fMRI session with the task difficulty set at the constant level followed. We showed that limiting vision in controls does not affect the motion-acuity thresholds, but results in brain activations, different from RP patients, indicating prompt implementation of the perceptually successful strategy. Impaired motion-acuity in RP patients led to decreased brain activations compared to controls with full and limited vision and included strong response within peripheral primary visual areas V1-3. Importantly, lower activations in MT+/V5, in salience-processing cortices and in superior temporal cortex in RP patients were also detected in controls with limited peripheral vision, revealing brain networks which compensate for loss of peripheral vision.

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Section: Discussionmentioning

confidence: 99%

Section: Motion-acuity Taskmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quest for good vision without peripheries - behavioral and fMRI evidence

Ninghetto,

Kozak,

Gałecki

et al. 2024

Preprint

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Visual training after central retinal loss limits structural white matter degradation: an MRI study

Kozak,

Ninghetto,

Wieteska

et al. 2024

Behav Brain Funct

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Background Macular degeneration of the eye is a common cause of blindness and affects 8% of the worldwide human population. In adult cats with bilateral lesions of the central retina, we explored the possibility that motion perception training can limit the associated degradation of the visual system. We evaluated how visual training affects behavioral performance and white matter structure. Recently, we proposed (Kozak et al. in Transl Vis Sci Technol 10:9, 2021) a new motion-acuity test for low vision patients, enabling full visual field functional assessment through simultaneous perception of shape and motion. Here, we integrated this test as the last step of a 10-week motion-perception training. Results Cats were divided into three groups: retinal-lesioned only and two trained groups, retinal-lesioned trained and control trained. The behavioral data revealed that trained cats with retinal lesions were superior in motion tasks, even when the difficulty relied only on acuity. 7 T-MRI scanning was done before and after lesioning at 5 different timepoints, followed by Fixel-Based and Fractional Anisotropy Analysis. In cats with retinal lesions, training resulted in a more localized and reduced percentage decrease in Fixel-Based Analysis metrics in the dLGN, caudate nucleus and hippocampus compared to untrained cats. In motion-sensitive area V5/PMLS, the significant decreases in fiber density were equally strong in retinal-lesioned untrained and trained cats, up to 40% in both groups. The only cortical area with Fractional Anisotropy values not affected by central retinal loss was area V5/PMLS. In other visual ROIs, the Fractional Anisotropy values increased over time in the untrained retinal lesioned group, whereas they decreased in the retinal lesioned trained group and remained at a similar level as in trained controls. Conclusions Overall, our MRI results showed a stabilizing effect of motion training applied soon after central retinal loss induction on white matter structure. We propose that introducing early motion-acuity training for low vision patients, aimed at the intact and active retinal peripheries, may facilitate brain plasticity processes toward better vision.

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Poza centrum uwagi: doświadczenie uczenia w szkole i w laboratorium neurobiologa

Burnat¹

2021

Ekologia Interdyscyplinarności

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Motion-Based Acuity Task: Full Visual Field Measurement of Shape and Motion Perception

Cited by 3 publications

References 22 publications

Quest for good vision without peripheries - behavioral and fMRI evidence

Quest for good vision without peripheries - behavioral and fMRI evidence

Visual training after central retinal loss limits structural white matter degradation: an MRI study

Poza centrum uwagi: doświadczenie uczenia w szkole i w laboratorium neurobiologa

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