Visual Evoked Potentials

Carter, Jonathan L.

doi:10.1093/med/9780195385113.003.0022

Cited by 10 publications

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“…Wallpaper groups differ in the number and kind of these transformations. In mathematical group theory, when the elements of one group is completely contained in another, the inner group is called a subgroup of the outer group[13]. Subgroup relationships between wallpaper groups can be distinguished by their indices.…”

Section: Resultsmentioning

confidence: 99%

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From image formation to image representation: the human visual system preserves the hierarchy of 2-dimensional pattern regularity

Kohler

Norcia

2017

Preprint

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SummarySymmetries are present at many scales in images of natural scenes, due to a complex interplay of physical forces that govern pattern formation in nature. The importance of symmetry for visual perception has been known at least since the gestalt movement of the early 20th century. Since then, symmetry has been shown to contribute to the perception of shapes[1, 2] scenes[3] and surface properties[4], as well as the social process of mate selection[5]. In the two spatial dimensions relevant for images, the four fundamental symmetries, reflection, rotation, translation and glide reflection, can be combined in 17 distinct ways, the “wallpaper” groups[6–8]. The 17 wallpaper obey a hierarchy of complexity, determined by mathematical group theory, where simpler groups are subgroups of more complex ones[9]. Here we use Steady-State Visual Evoked Potentials (SSVEPs) to measure responses to the complete set of wallpaper groups, and present a complete description of the neural basis of symmetry. We find that activity in human visual cortex is remarkably consistent with the hierarchical relationships between the wallpaper groups. Specifically, the amplitudes of symmetry-specific responses in individual participants (n=25) preserve these relationships at an above-chance level in 88.3% (53 out of 60) of cases. Visual cortex thus encodes all the fundamental symmetries using a representational structure that closely approximates the subgroup relationships from group theory. Given that most participants had no knowledge of group theory, the ordered structure of visual responses to wallpaper groups is likely learned implicitly from regularities in the visual environment.

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Section: Resultsmentioning

confidence: 99%

“…The index of a subgroup relationship is the number of cosets, i.e. the number of times the subgroup is found in the outer group[13]. As an example, let us consider groups P6 and P2.…”

Section: Resultsmentioning

confidence: 99%

From image formation to image representation: the human visual system preserves the hierarchy of 2-dimensional pattern regularity

Kohler

Norcia

2017

Preprint

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“…PVEP abnormalities have been described in DM, but increased P100 latency rate is ranging from 9% to 77% [15–17]. Abnormalities in PVEP latencies are much more important diagnostically than abnormalities in PVEP amplitude [10]. In this study, we assessed PVEP latencies rather than amplitudes.…”

Section: Discussionmentioning

confidence: 99%

“…In the VEP method, visual fields are stimulated with a checkerboard visual stimulus, and the evoked response is recorded using surface recording electrodes. To not miss unilateral defects in the visual pathway, monocular stimulation is recommended in adults [10]. There are three stimulus protocols for recording VEP which are pattern VEP (PVEP), pattern onset/offset VEP, and flash VEP [11].…”

Section: Introductionmentioning

confidence: 99%

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Pattern Visual Evoked Potential Changes in Diabetic Patients without Retinopathy

Balta

Sungur

Yakin

et al. 2017

Journal of Ophthalmology

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Purpose. To assess the different check sizes of pattern visual evoked potential (PVEP) in diabetic patients without retinopathy according to HbA1c levels and diabetes duration. Methods. Fifty-eight eligible patients with type 2 diabetes mellitus and 26 age- and sex-matched healthy controls were included in the study. Only the right eye of each patient was analyzed. All of the patients underwent a comprehensive ophthalmic examination, and the PVEPs were recorded. Results. There was a statistically significant difference in P100 latency in 1-degree check size and in N135 latency in 2-degree check size between controls and patient groups which have different HbA1c levels. There were statistically significant, positive, and weak correlations with diabetes duration and P100 latency in 7-minute and 15-minute check sizes and N135 latency in 15-minute check size. Conclusions. It was showed that there were prolongations in P100 latency only in 1-degree check size and in N135 only in 2-degree check size in diabetic patients without retinopathy. There was statistically significant correlation between diabetes duration and P100 and N135 latencies in different check sizes.

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Evaluation of EEG Data for Zonal Affiliation of Brain Waves by Leads in a Robot Control Task

Wolf,

Turovsky,

Iskhakova

et al. 2023

Lecture Notes in Computer Science

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Visual Evoked Potentials

Cited by 10 publications

References 0 publications

From image formation to image representation: the human visual system preserves the hierarchy of 2-dimensional pattern regularity

From image formation to image representation: the human visual system preserves the hierarchy of 2-dimensional pattern regularity

Pattern Visual Evoked Potential Changes in Diabetic Patients without Retinopathy

Evaluation of EEG Data for Zonal Affiliation of Brain Waves by Leads in a Robot Control Task

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