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Background: The aim of this paper is to investigate the associations between polymorphisms in the BDNF , COMT , and HTR2A genes with peculiarity of visual perception. In particular, how the carriers of different genotypes of Indicated genes emotionally evaluating visual scenes with distinct second-order features (images modulated by contrast) and how corresponding process is reflected in event-related brain activity (ERP). Methods: The study involved students who underwent PCR-based genetic analysis with the release of BDNF , COMT , and HTR2A genotypes. Participants were asked to emotionally assesse the specific stimuli – visual scenes that were generated from contrast modulations. At the same time the EEG were recorded using a 128-electrodes system. The average frequency of responses and ERPs for different emotional evaluations (negative, neutral and positive) were analyzed. Results: The study showed the BDNF Val/Val polymorphism was associated with the increase in the P2 amplitude in the occipital regions compared to the Val/Met genotype regardless of emotional evaluation. The COMT Met/Met genotype polymorphism associated with the increase of N170 negativity in the occipital regions during evaluation task. The HTR2A polymorphism A/A associated with increase in the P1 amplitude when positive or negative assessment were chosen, and decrease of later positive peak when neutral evaluation was chosen. Conclusions: The results suggested that emotional evaluation and recognition of visual scenes with distinct second-order features, as well as various strategies for processing visual information, reflected in amplitude and latency of different ERPs components and associated with the different genotypes of BDNF , COMT , and HTR2A genes. The indicated interconnections can act as genetic basis of individualize the mechanisms of visual perception.

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Associations between genetic factors in individualization of visual perception and components of event-related potentials during assessment of emotional visual stimuli (scenes) with distinct second-order features