Autonomic Regulation of Heart Rate and Distinctive Features of Oculomotor Activity in Eight- to Nine-Year-Old Boys and Girls during the Reading of Texts of Different Complexities

Distinctive features of autonomic regulation of the heart rate and spatiotemporal parameters of eye movements during the reading of texts of different complexities levels from a computer screen have been analyzed in girls and boys eight to nine years of age. Sex-related differences in heart rate variability (HRV) pattern were already observed in the resting state, since parasympathetic effects were stronger in boys than in girls. Parasympathetic activity decreased in boys who were reading texts of different complexities. The most pronounced decrease was observed during the reading of the first (simple) text. The changes in girls were mostly due to an increase in sympathetic activity and were less pronounced than in boys. Oculomotor activity analysis revealed differences in reading process strategy: reading was more fragmented (discrete) in the girls and more integrated in the boys. However, reading skills were not fully developed in children of eight to nine years of age, since “syllabized” reading was observed in girls and boys alike.