Mechanisms of internal pronunciation and perception in different types of external initiation

The electrical activity of the brain was detected in tasks on the perception and pronunciation of individual phonemes and syllables of the Russian language under various conditions of initiation of the pronunciation process. The conditions for initiation were visual presentation (a letter was shown), auditory presentation, and also auditory presentation of conditioned stimuli (words in an unfamiliar language to the subject, previously associated with the corresponding phonemes). EPs were obtained for a group of 25 subjects for perception and internal pronunciation of 7 phonemes and 10 syllables for each of the initiation conditions. As a result, it was shown that the averaged evoked potential for the signal of pronouncing phonemes and syllables depends on the initialization method. This is important to consider when developing methods for decoding internal speech and automatic classifiers.