[The characteristics of the electrical reactions of the sensorimotor cortex to real and mental movement in left-handed and ambidextrous subjects with speech disorders at age 6-7].

Responses of alpha-, theta- and beta-I rhythms of the sensorimotor cortex to sound, movement and its mental reproduction for the right and left hand are described in 8 normal and 11 children aged 6 to 7 years with general speech disorders (GSD). Differences in the responses of left-handers and ambidextrous children were recorded. They lie in the degree of the involvement of the hemispheres, in the character of asymmetry and rhythmical composition of the response. Ambidextrous children in health and with GSD were characterized by noticeable responsiveness of the theta rhythm. In left-handers with GSD, the responses towards movement did not differ from normal, with asymmetry of the response to sound being less. As compared to normal children, ambidextrous ones with GSD showed mirror reactions. It is assumed that in children with GSD ambidexterity may be of pathological nature.