Dergi Ara >>
Yıl:2020; Cilt: 8; Sayı: 18>> Özet
TAM METİN
Nesne Psikoloji Dergisi; 2020;8(18):522-547
Görsel Yanılsamalar Bağlamında Görsel Algının Esasları
İ Ayhan, G Ünal
Boğaziçi Üniversitesi,İstanbul
Retinadan görsel kortekse iletilen düşük çözünürlüklü, muğlak sinyalin canlı ve anlamlı bir fenomenolojik deneyime dönüşümünde dış dünyadan gelen veri kadar bellekte kodlanan semantik bilgi, figür-arkaplan segmentasyonu ve gruplama ilkeleri ile hâlihazırdaki duygudurum ve beklentiler de büyük rol oynar. Dış dünyanın nesnel özellikleri ile öznel temsili arasındaki uyumsuzluk olarak tanımlayabileceğimiz görsel yanılsamalar, görsel algının yaygın bir özniteliği olup beyindeki karmaşık bilgi işlem sisteminin yapı ve işlevlerine dair anlamlı içgörüler sunar. Bu bağlamda görsel yanılsamalar kısıtlı nöronal ve metabolik kaynakların etkili kullanımına olanak sağlayan optimizasyon stratejilerinin bir sonucu olup; görsel sistemin limitasyonlarını değil, bu limitasyonlarla başa çıkabilmeyi olanaklı kılan doğal çalışma prensiplerini yansıtır. Bu noktadan yola çıkarak bu derlemede bir takım görsel yanılsamalara yer verilecek, bu yanılsamalar bağlamında görsel algının temel çalışma prensipleri listelenip bu prensiplerin işlevlerine dair özet bir çerçeve sunulacaktır. Derleme sonunda Bayesyen çıkarımlar ve psikopatoloji, yanılsamalar ve alfa beyin dalgaları, zaman algısı gibi alandaki son dönem araştırmalara da değinilecek, bu araştırmalar bağlamında güncel çalışmaların gittiği yön tasvir edilecektir.
The Principles of Visual Perception Within The Context of Visual Illusions Abstract
In the transformation of the low-level, ambiguous retinal signal into a vivid and meaningful phenomenological experience, certain aspects are as essential as the input coming from the external environment. The semantic knowledge stored in memory, figure-background segmentation, grouping principles, and current mood and expectations of the person are equally important. Visual illusions, which might be described as the discrepancy between the objective properties of the external world and their subjective representations, is a common feature of the visual perception that provides meaningful insights with regards to the structure and function of the complex information processor in the brain. In this context, visual illusions are the end results of the optimization strategies that allow the effective use of limited neuronal and metabolic resources, and thus reflect the natural working principles while coping with these limitations, rather than restrictions inflicted upon the system. In this review, we present a compilation of illusions and summarize the key principles of visual perception on the basis of these visual phenomena. In the final section, we also discuss a number of recent topics within the context of Bayesian inference and psychopathology, illusions and alpha brain oscillations and time perception to describe the current directions in the field.

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