**Author details**

various stages of pre-school age is practically unchanged. We believe that this fact has important prognostic significance and allows an early diagnosis of deficits in complex

Particular attention is paid to the results of the 6-year-old children who are about to go to school. Exported data show that one-fourth of them fall behind a group characterized by the incomplete processing of the right-brain ventral visual system and insufficient involvement of control functions of the prefrontal regions. The engrames of objects in long-term memory are not sufficiently built up, making it difficult to form proper perceptive hypotheses. We assume that children in this group will face obvious difficulties in recognizing and differentiating graphical characters (alphanumeric, numeric and geometric), allowing them to be identified

The unsatisfactory development of the complex forms of visual perception could be viewed as a predictor for future reading difficulties and proves the diagnostic and prognostic validity

The analysis of the represented data shows that for the age period 4–6 there is a process of dynamic maturation of the right-brain structures of the ventral visual system and their connections to the structures of the prefrontal cortex, leading to gradual improvement of the children's abilities for visual discrimination of objects in difficult circumstances (incomplete images). Impact on the development of complex forms of non-verbal visual gnosis has the combination of age, demographic and gender factors, among which a special place is the age of 5 years. The positive dynamics of the mechanisms of holistic processing of complex non-verbal stimuli started in the pre-school period, but their formation continued in the next stages. Particular attention is paid to the fact that over the 6-year period most of the children with typical development continue to show great difficulty in recognizing incomplete images. They enroll at school with underdeveloped perceptual and control functions, which is why the group should be considered as risky for the development of

The neuropsychological probe "Recognition of incomplete images" is a sensitized option for the diagnosis of non-verbal visual gnosis in childhood. It has a high prognostic value and allows an early detection of cases of delayed development within the broad childhood norm. The application of the task (in isolation or in combination with others) supplemented by a competent quantitative and qualitative analysis responds to the leading tendencies in modern child neuropsychology and allows the timely identification of children at risk of learning

of the sample to recognize incomplete images for the pre-school age period.

forms of visual gnosis.

36 Prefrontal Cortex

**7. Conclusion**

dyslexic symptoms.

difficulties.

**Conflict of interest**

Author declares no conflict of interests.

as a risk group for specific learning disorders (dyslexia).

Neli Cvetanova Vasileva

Address all correspondence to: vasnel@abv.bg

Sofia University "St. Kliment Ohridski", Sofia, Bulgaria
