Neurophysiological assessment of speech function in individuals having a history of mild COVID-19
Establishing a link between the objective research data and the thought process is one of the major issues of modern neurophysiology. The study was aimed to find an opportunity to perform objective analysis of the causes of cognitive impairment in individuals having a history of mild novel coronavirus infection by solving the inverse EEG problem. A total of 38 COVID-19 survivors were assessed, who had returned to work. The control group included 33 healthy individuals. EEG was recorded using a 128-channel system with an average reference. The data obtained were subjected to the EEG microstate segmentation and converted using the algorithm for solving the inverse EEG problem implemented in the sLORETA software package. In individuals with no history of COVID-19 being in a state of relaxed wakefulness, the component of rhythmic activity within Brodmann area 47, responsible for perception and realization of music, was found in all classes of EEG microstates (0.01 < p < 0.05; χ2-test). Auditory-speech load was characterized by rhythmic activity within areas 22, 23, 37, 39, 40, 44, 45, and 47. In individuals having a history of novel coronavirus infection being in a state of relaxed wakefulness, rhythmic activity within areas 22, 37, 39, 40 was detected. Under auditory-speech load, there was rhythmic activity within areas 37, 39, and 41 (p < 0.05; χ2-test). Thus, alterations in realization of speech function in the form of the disordered sequence of switching on the main language centers were revealed in COVID-19 survivors.