Left-eyedness as a possible correlate of reading disorder: brain mechanisms of language processingстатьяТезисы
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Аннотация:Introduction. Role of eye dominance in language processing is usually not considered. This research is devoted to the brain mechanisms of language processing in left-eyed humans. Methods. 34 right-handed (20 right-eyed, R; 14 left-eyed, L) healthy participants were recruited to perform classical Stroop (CS), modified Stroop (MS) and Stop-signal tasks (StS). Both Stroop tasks consisted of the Russian words “red” and “green” written in a red or green font and required to recognize a font color. In MS-task participants inhibited the response to the word “red” and responded only to the word “green”. In StS participants distinguished between green consonants and vowels and ignored red letters. The fMRI data were obtained using a 3T scanner SIEMENS Magnetom Verio (T2*-weighted, 65 slices, TR/TE = 2200 / 25 ms, slice thickness = 2 mm, FA = 90°, MB 5, CMRR, block design) and processed using SPM12 (p FWE < 0.01, cluster level). Results. The activated clusters were shown in the contrasts: MS > CS – right precuneus (L), right precuneus & right angular gyrus (R), MS > StS – left precuneus (L), StS > MS – left occipital pole (L), left inferior occipital gyrus & right occipital pole (R), StS > CS – left and right occipital poles (L), left and right inferior occipital gyri & right inferior temporal gyrus (R). Conclusions. Activation of right inferior temporal gyrus as a part of ventral stream seems to be related to letters recognition and might be insufficient in left-eyed humans. This fact may be a possible correlate of reading disorder such as dyslexia.
The research was financially supported by the Russian Science Foundation, project No 16-18-00066, and the Supercomputing Center of Lomonosov Moscow State University (non-financially)