The level of development of cognitive functions in 7-8 year olds with difficulties in understanding of language passive and prepositional logic-grammar constructions was studied. The Rey-Osterrieth Complex Figure Test and neuropsychological procedure for children were applied for the evaluation of higher psychic functions. The children characterized by low level of understanding logic-grammar constructions of language showed significantly poorer results in neuropsychological trials as compared to control group. Data lead to assumption that the children with low level of understanding logic-grammar constructions of language have low level of brain simultaneous mechanism development.