A Comprehensive Review on Methodologies Employed for Visual Evoked Potentials

Kothari, Ruchi; Bokariya, Pradeep; Singh, Sanjeet Singh Avtaar; Singh, Ramji

doi:10.1155/2016/9852194

Cited by 35 publications

(30 citation statements)

References 26 publications

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“…The time windows of these two components are fairly congruent with previous "brain microstate" EEG studies on action processing, which identified periods of stability in the brain activity between roughly 0 and 120-ms over the visual cortex and between roughly 120 and 200-ms over the posterior temporal and inferior parietal cortices 16,17 . The P100 component is routinely used in ophthalmology to evaluate the integrity of the visual cortices 44,45 , and the N170 has been shown to be particularly sensitive to inversion effects (comparison between upright/upside-down pictures) of body parts and, to a lesser extent, of objects 42,46 . Both components have been linked to the activity of the visual cortices, the P100 being generated by the primary visual cortex, and the N170 by the associative visual cortices at the border of the temporal and parietal cortices 42 .…”

Section: Discussionmentioning

confidence: 99%

Neural dynamics of grip and goal integration during the processing of others’ actions with objects: An ERP study

Decroix

Roger

Kalénine

2020

Sci Rep

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Recent behavioural evidence suggests that when processing others' actions, motor acts and goalrelated information both contribute to action recognition. Yet the neuronal mechanisms underlying the dynamic integration of the two action dimensions remain unclear. this study aims to elucidate the eRp components underlying the processing and integration of grip and goal-related information. the electrophysiological activity of 28 adults was recorded during the processing of object-directed action photographs (e.g., writing with pencil) containing either grip violations (e.g. upright pencil grasped with atypical-grip), goal violations (e.g., upside-down pencil grasped with typical-grip), both grip and goal violations (e.g., upside-down pencil grasped with atypical-grip), or no violations. participants judged whether actions were overall typical or not according to object typical use. Brain activity was sensitive to the congruency between grip and goal information on the N400, reflecting the semantic integration between the two dimensions. On earlier components, brain activity was affected by grip and goal typicality independently. Critically, goal typicality but not grip typicality affected brain activity on the N300, supporting an earlier role of goal-related representations in action recognition. Findings provide new insights on the neural temporal dynamics of the integration of motor acts and goal-related information during the processing of others' actions.Understanding the actions performed by others is a core ability of human beings 1,2 . Yet, actions are no mere movements but organised and goal-directed movements 3,4 . Thus, understanding others' actions does not only imply the processing of the motor act (e.g., both dynamic and static components of reaching and grasping a bottle) but also the recognition of the actor's goal (e.g., to drink or to move it away). Accordingly, observers mainly perceive others' actions in terms of goals 5-8 and may use different sources of information to this end (e.g., dynamic and static component of the motor act 9 ; functional knowledge about objects 10 ; contextual information 11,12 , among others). Although numerous studies have demonstrated that both information about the motor act and information about the goal of the actor are processed during the decoding of others' actions, the precise role of the two types of information in action recognition remains debated.Important theoretical accounts have highlighted the need to consider the processing of others' actions as a dynamic phenomenon 3,13-15 that cannot be fully uncovered without considering the temporal dynamics of motor acts and action goal decoding. The observation of several successive periods of stability in the brain activity (i.e. "micro-state") when visually processing others' actions 16,17 further supports the idea that the decoding of others' actions is a multistep process. In a recent behavioural experiment, we also demonstrated that the involvement of action goal and static motor act information in action recog...

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Section: Discussionmentioning

confidence: 99%

Neural dynamics of grip and goal integration during the processing of others’ actions with objects: An ERP study

Decroix

Roger

Kalénine

2020

Sci Rep

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“…First, compared to behavioral acuity, with decisions made quickly, VEP needs a longer time due to the requirement of sufficient data [ 144 ]. Next, the higher cognitive cortex is involved in the behavioral test, but VEP is only cellular activity in the primary visual cortex [ 145 ]. Finally, compared to the stationary targets of behavioral acuity, VEP acuity utilizes dynamic targets.…”

Section: Discussionmentioning

confidence: 99%

Assessment of Human Visual Acuity Using Visual Evoked Potential: A Review

Zheng

Liang

et al. 2020

Sensors

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Visual evoked potential (VEP) has been used as an alternative method to assess visual acuity objectively, especially in non-verbal infants and adults with low intellectual abilities or malingering. By sweeping the spatial frequency of visual stimuli and recording the corresponding VEP, VEP acuity can be defined by analyzing electroencephalography (EEG) signals. This paper presents a review on the VEP-based visual acuity assessment technique, including a brief overview of the technique, the effects of the parameters of visual stimuli, and signal acquisition and analysis of the VEP acuity test, and a summary of the current clinical applications of the technique. Finally, we discuss the current problems in this research domain and potential future work, which may enable this technique to be used more widely and quickly, deepening the VEP and even electrophysiology research on the detection and diagnosis of visual function.

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“…Dışlama ölçütleri ise kronik 80 Tablo 1. Zenon ve ışık yayan diyot lamba ile elde edilen elektroretinografi kayıtlarındaki "a" ve "b" dalgalarının gecikme süreleri (ms) ve genlikleri (µV) "a" gecikme süresi "b" gecikme süresi "a" genliği "b" genliği (12,13).…”

Section: Gereç Ve Yöntemler öRneklemunclassified

Elektroretinografi Ve Görsel Uyarılmış Potansiyel Ölçümlerinde Zenon Ve LED Işık Kaynaklarının Karşılaştırılması

Aksu

Kurt

Soyata

et al. 2019

Anadolu Kliniği Tıp Bilimleri Dergisi

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ÖzAmaç: Elektroretinografi (ERG) ve görsel uyarılmış potansiyeller (GUP) görsel bir uyarana yanıt olarak retinada veya oksipital korteksteki primer görme alanında oluşan elektriksel etkinliği ölçen ve görme yollarını nesnel olarak değerlendiren önemli tanı araçlarıdır. Elektriksel potansiyellerin oluşturulması için zenon ya da ışık yayan diyot (LED) ışık kaynağı kullanılabilmektedir. Her iki ışık kaynağı da kullanılarak ölçülen ERG ve GUP kayıtlarını aynı örneklemde karşılaştıran bir araştırmaya rastlanmadığı için, bu çalışmada sağlıklı gönüllülerde zenon ve LED ışık kaynağı kullanılarak oluşturulan ERG ve GUP ölçümlerini karşılaştırmak amaçlanmıştır. Gereç ve Yöntemler: Araştırmanın örneklemi 21-30 yaş aralığındaki 31 sağlıklı gönüllüden oluşmuştur. LED ve zenon ışık kaynağı ile her iki gözden ayrı ayrı ERG ve GUP kayıtları alındı. ERG kayıtlarındaki "a," "b," ve GUP kayıtlarındaki N2, P2 dalgalarının gecikme süreleri ve genlikleri eşleştirilmiş t-testiyle karşılaştırıldı. Bulgular: LED ışık kaynağıyla elde edilen ERG kayıtlarında zenon ışık kaynağıyla elde edilen kayıtlara göre a (p<0,001) ve b (p<0,001) dalgalarının genlikleri daha düşük bulundu. LED ışık kaynağı ile elde edilen GUP kayıtlarında ise zenon ışık kaynağı ile elde edilen kayıtlara göre P2 dalgasının genliği (p<0,001) daha düşük bulundu. Ancak her iki ışık kaynağı ile elde edilen ERG ve GUP kayıtlarındaki gecikme süreleri arasında fark saptanmadı. Tartışma ve Sonuç: LED ışık kaynağı ile elde edilen ERG ve GUP kayıtlarının, zenon lamba ile elde edilenlere büyük ölçüde benzer bir dalga morfolojisine sahip olduğu görülmüştür. Ancak bazı dalgalarda daha düşük genlikler elde edilmiştir ve bu durumun görme bozukluklarının saptanmasındaki duyarlılık ve özgüllüğünün azalmasına neden olabileceği düşünülmüştür. LED ışık kaynağı ile yapılan GUP ve ERG ölçümlerindeki genlikleri artırmak için monokromatik LED ve özel gözlük kullanılması gibi değişiklikler önerilebilir. Anahtar Sözcükler: elektrofizyoloji; elektroretinografi; görsel testler; görsel uyarılmış potansiyeller Abstract Aim: Electroretinography (ERG) and visual evoked potentials (VEP) are important diagnostic tools that measure the electrical activity occurring in the retina or the occipital cortex after visual stimuli and assess the visual pathways objectively. Xenon or light emitting diode (LED) light sources can be used to generate the electrical potentials. Because no previous study was found to compare ERG and VEP measurements generated by using both light sources in the same sample, this study aimed to compare ERG and VEP measurements using both LED and xenon light sources in healthy volunteers. Materials and Methods: The study sample comprised 31 healthy volunteers aged between 21 and 30 years. ERG and VEP recordings of both eyes were obtained separately by use of LED * Bu çalışma daha önce poster bildiri olarak The 15th European Congress on Clinical Neurophysiology, and the 62nd Congress of the Czech and Slovak Society of Clinical Neurophysiology adlı etkinlikte sunulmuştur. Orijinal Makale/Or...

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A Comprehensive Review on Methodologies Employed for Visual Evoked Potentials

Cited by 35 publications

References 26 publications

Neural dynamics of grip and goal integration during the processing of others’ actions with objects: An ERP study

Neural dynamics of grip and goal integration during the processing of others’ actions with objects: An ERP study

Assessment of Human Visual Acuity Using Visual Evoked Potential: A Review

Elektroretinografi Ve Görsel Uyarılmış Potansiyel Ölçümlerinde Zenon Ve LED Işık Kaynaklarının Karşılaştırılması

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